10 CFR Part 430 - PART 430—ENERGY CONSERVATION PROGRAM FOR CONSUMER PRODUCTS

  1. Subpart A—General Provisions (§§ 430.1 - 430.5)
  2. Subpart B—Test Procedures (§§ 430.21 - 430.27)
  3. Appendix O to Subpart B of Part 430—Uniform Test Method for Measuring the Energy Consumption of Vented Home Heating Equipment
  4. Appendix P to Subpart B of Part 430—Uniform Test Method for Measuring the Energy Consumption of Pool Heaters
  5. Appendix Q to Subpart B of Part 430—Uniform Test Method for Measuring the Energy Consumption of Fluorescent Lamp Ballasts
  6. Appendix R to Subpart B of Part 430—Uniform Test Method for Measuring Electrical and Photometric Characteristics of General Service Fluorescent Lamps, Incandescent Reflector Lamps, and General Service Incandescent Lamps
  7. Appendix S to Subpart B of Part 430—Uniform Test Method for Measuring the Water Consumption of Faucets and Showerheads
  8. Appendix T to Subpart B of Part 430—Uniform Test Method for Measuring the Water Consumption of Water Closets and Urinals
  9. Appendix U to Subpart B of Part 430—Uniform Test Method for Measuring the Energy Consumption of Ceiling Fans
  10. Appendix V to Subpart B of Part 430—Uniform Test Method for Measuring the Energy Consumption of Ceiling Fan Light Kits Packaged With Other Fluorescent Lamps (Not Compact Fluorescent Lamps or General Service Fluorescent Lamps), Packaged With Consumer-Replaceable SSL (Not Integrated LED Lamps), Packaged With Non-Consumer-Replaceable SSL, or Packaged With Other SSL Lamps That Have an ANSI Standard Base (Not Integrated LED Lamps)
  11. Appendix W to Subpart B of Part 430—Uniform Test Method for Measuring the Energy Consumption of Compact Fluorescent Lamps
  12. Appendix X to Subpart B of Part 430—Uniform Test Method for Measuring the Energy Consumption of Dehumidifiers
  13. Appendix X1 to Subpart B of Part 430—Uniform Test Method for Measuring the Energy Consumption of Dehumidifiers
  14. Appendix Y to Subpart B of Part 430—Uniform Test Method for Measuring the Energy Consumption of Battery Chargers
  15. Appendix Y1 to Subpart B of Part 430—Uniform Test Method for Measuring the Energy Consumption of Battery Chargers
  16. Appendix Z to Subpart B of Part 430—Uniform Test Method for Measuring the Energy Consumption of External Power Supplies
  17. Appendix AA to Subpart B of Part 430—Uniform Test Method for Measuring the Energy Consumption of Furnace Fans
  18. Appendix BB to Subpart B of Part 430—Uniform Test Method for Measuring the Input Power, Lumen Output, Lamp Efficacy, Correlated Color Temperature (CCT), Color Rendering Index (CRI), Power Factor, Time to Failure, and Standby Mode Power of Integrated Light-Emitting Diode (LED) Lamps
  19. Appendix CC to Subpart B of Part 430—Uniform Test Method for Measuring the Energy Consumption of Portable Air Conditioners
  20. Appendix CC1 to Subpart B of Part 430—Uniform Test Method for Measuring the Energy Consumption of Portable Air Conditioners
  21. Appendix DD to Subpart B of Part 430—Uniform Test Method for Measuring the Energy Consumption and Energy Efficiency of General Service Lamps That Are Not General Service Incandescent Lamps, Compact Fluorescent Lamps, or Integrated LED Lamps
  22. Appendix EE to Subpart B of Part 430—Uniform Test Method For Measuring the Energy Consumption of Consumer Boilers
  23. Appendix FF to Subpart B of Part 430—Uniform Test Method for Measuring the Energy Consumption of Air Cleaners
  24. Appendix GG to Subpart B of Part 430—Uniform Test Method for Measuring the Energy Consumption of Portable Electric Spas
  25. Subpart C—Energy and Water Conservation Standards (§§ 430.31 - 430.35)
  26. Subpart D—Petitions To Exempt State Regulation From Preemption; Petitions To Withdraw Exemption of State Regulation (§§ 430.40 - 430.49)
  27. Subpart E—Small Business Exemptions (§§ 430.50 - 430.57)
  28. Subpart F [Reserved]
Authority:
42 U.S.C. 6291–6309; 28 U.S.C. 2461 note.
Source:
42 FR 27898, June 1, 1977, unless otherwise noted.
Where:
LL,A = value as defined in section 11.2.7 of ASHRAE 103–1993,
LG = value as defined in section 11.3.11.1 of ASHRAE 103–1993, at reduced input rate,
LC = value as defined in section 11.3.11.2 of ASHRAE 103–1993 at reduced input rate,
LJ = value as defined in section 11.4.8.1.1 of ASHRAE 103–1993 at maximum input rate,
tON = value as defined in section 11.4.9.11 of ASHRAE 103–1993,
QP = pilot fuel input rate determined in accordance with section 9.2 of ASHRAE 103–1993 in Btu/h,
QIN = value as defined in section 11.4.8.1.1 of ASHRAE 103–1993,
tOFF = value as defined in section 11.4.9.12 of ASHRAE 103–1993 at reduced input rate,
LS,ON = value as defined in section 11.4.10.5 of ASHRAE 103–1993 at reduced input rate,
LS,OFF = value as defined in section 11.4.10.6 of ASHRAE 103–1993 at reduced input rate,
LI,ON = value as defined in section 11.4.10.7 of ASHRAE 103–1993 at reduced input rate,
LI,OFF = value as defined in section 11.4.10.8 of ASHRAE 103–1993 at reduced input rate,
CJ = jacket loss factor and equal to:
= 0.0 for furnaces intended to be installed indoors
= 1.7 for furnaces intended to be installed as isolated combustion systems
= 3.3 for furnaces intended to be installed outdoors
LS,SS = value as defined in section 11.4.6 of ASHRAE 103–1993 at reduced input rate,
CS = value as defined in section 11.3.10.1 of ASHRAE 103–1993 at reduced input rate.

10.3 Part-Load Efficiency at Maximum Fuel Input Rate. If the option in section 8.9 of this appendix is not employed, calculate the part-load efficiency at maximum fuel input rate, EffyU,H, for condensing furnaces equipped with two-stage controls, expressed as a percent and defined as:

Where:
LL,A = value as defined in section 11.2.7 of ASHRAE 103–1993,
LG = value as defined in section 11.3.11.1 of ASHRAE 103–1993 at maximum input rate,
LC = value as defined in section 11.3.11.2 of ASHRAE 103–1993 at maximum input rate,
LJ = value as defined in section 11.4.8.1.1 of ASHRAE 103–1993 at maximum input rate,
tON = value as defined in section 11.4.9.11 of ASHRAE 103–1993,
QP = pilot fuel input rate determined in accordance with section 9.2 of ASHRAE 103–1993 in Btu/h,
QIN = value as defined in section 11.4.8.1.1 of ASHRAE 103–1993,
tOFF = value as defined in section 11.4.9.12 of ASHRAE 103–1993 at maximum input rate,
LS,ON = value as defined in section 11.4.10.5 of ASHRAE 103–1993 at maximum input rate,
LS,OFF = value as defined in section 11.4.10.6 of ASHRAE 103–1993 at maximum input rate,
LI,ON = value as defined in section 11.4.10.7 of ASHRAE 103–1993 at maximum input rate,
LI,OFF = value as defined in section 11.4.10.8 of ASHRAE 103–1993 at maximum input rate,
CJ = value as defined in section 10.2 of this appendix,
LS,SS = value as defined in section 11.4.6 of ASHRAE 103–1993 at maximum input rate,
CS = value as defined in section 11.4.10.1 of ASHRAE 103–1993 at maximum input rate.

10.4 National average burner operating hours, average annual fuel energy consumption, and average annual auxiliary electrical energy consumption for gas or oil furnaces.

10.4.1 National average number of burner operating hours. For furnaces equipped with single-stage controls, the national average number of burner operating hours is defined as:

BOHSS = 2,080 (0.77) (A) DHR − 2,080 (B)
Where:
2,080 = national average heating load hours
0.77 = adjustment factor to adjust the calculated design heating requirement and heating load hours to the actual heating load experienced by the heating system
A = 100,000/[341,200 (yP PE + yIG PEIG + y BE) + (QIN − QP) EffyHS], for forced draft unit, indoors
= 100,000/[341,200 (yP PE Effmotor + yIG PEIG + y BE) + (QIN − QP) EffyHS], for forced draft unit, isolated combustion system,
= 100,000/[341,200 (yP PE (1 − Effmotor) + yIG PEIG + y BE) + (QIN − QP) EffyHS], for induced draft unit, indoors, and
= 100,000/[341,200 (yIG PEIG + y BE) + (QIN − QP) EffyHS], for induced draft unit, isolated combustion system.
DHR = typical design heating requirements as listed in Table 8 (in kBtu/h) of ASHRAE 103–1993, using the proper value of QOUT defined in section 11.2.8.1 of ASHRAE 103–1993.
B = 2 QP (EffyHS) (A)/100,000
Where:
Effmotor = nameplate power burner motor efficiency provided by the manufacturer,
= 0.50, an assumed default power burner efficiency if not provided by the manufacturer.
100,000 = factor that accounts for percent and kBtu
yP = ratio of induced or forced draft blower on-time to average burner on-time, as follows:
1 for units without post-purge;
1 + (tP/3.87) for single stage furnaces with post purge; or
1 + (tP/10) for two-stage and step modulating furnaces with post purge.
PE = all electrical power related to burner operation at full load steady-state operation, including electrical ignition device if energized, controls, gas valve or oil control valve, and draft inducer, as determined in section 8.2 of this appendix.
yIG = ratio of burner interrupted ignition device on-time to average burner on-time, as follows:
0 for burners not equipped with interrupted ignition device;
(tIG/3.87) for single-stage furnaces; or
(tIG/10) for two-stage and step modulating furnaces;
PEIG = electrical input rate to the interrupted ignition device on burner (if employed), as defined in section 8.3 of this appendix
y = ratio of blower on-time to average burner on-time, as follows:
1 for furnaces without fan delay;
1 + (t +−t−)/3.87 for single-stage furnaces with fan delay; or
1 + (t +−t−)/10 for two-stage and step modulating furnaces with fan delay.
BE = circulating air fan electrical energy input rate at full-load steady-state operation as defined in section 8.2 of this appendix.
tP = post-purge time as defined in section 8.5 of this appendix
= 0 if tP is equal to or less than 30 seconds
tIG = on-time of the burner interrupted ignition device, as defined in section 8.3 of this appendix
QIN = as defined in section 11.2.8.1 of ASHRAE 103–1993
QP = as defined in section 11.2.11 of ASHRAE 103–1993
EffyHS = as defined in section 11.2.11 (non-condensing systems) or section 11.3.11.3 (condensing systems) of ASHRAE 103–1993, percent, and calculated on the basis of:
isolated combustion system installation, for non-weatherized warm air furnaces; or outdoor installation, for furnaces that are weatherized.
2 = ratio of the average length of the heating season in hours to the average heating load hours
t + = delay time between burner shutoff and the blower shutoff measured as defined in section 9.5.1.2 of ASHRAE 103–1993
t− = as defined in section 9.6.1 of ASHRAE 103–1993

10.4.1.1 For furnaces equipped with two stage or step modulating controls the average annual energy used during the heating season, EM, is defined as:

EM = (QIN−QP) BOHSS + (8,760−4,600) QP
Where:
QIN = as defined in section 11.4.8.1.1 of ASHRAE 103–1993
QP = as defined in section 11.4.12 of ASHRAE 103–1993
BOHSS = as defined in section 10.4.1 of this appendix, in which the weighted EffyHS as defined in section 11.4.11.3 or 11.5.11.3 of ASHRAE 103–1993 is used for calculating the values of A and B, the term DHR is based on the value of QOUT defined in section 11.4.8.1.1 or 11.5.8.1.1 of ASHRAE 103–1993, and the term (yPPE + yIGPEIG + yBE) in the factor A is increased by the factor R, which is defined as:
R = 2.3 for two stage controls
= 2.3 for step modulating controls when the ratio of minimum-to-maximum output is greater than or equal to 0.5
= 3.0 for step modulating controls when the ratio of minimum-to-maximum output is less than 0.5
A = 100,000/[341,200 (yP PE + yIG PEIG + y BE) R + (QIN−QP) EffyHS], for forced draft unit, indoors
= 100,000/[341,200 (yP PE Effmotor + yIG PEIG + y BE) R + (QIN−QP) EffyHS], for forced draft unit, isolated combustion system,
= 100,000/[341,200 (yP PE (1−Effmotor) + yIG PEIG + y BE) R + (QIN−QP) EffyHS], for induced draft unit, indoors, and
= 100,000/[341,200 (yIG PEIG + y BE) R + (QIN−QP) EffyHS], for induced draft unit, isolated combustion system.
Where:
Effmotor = nameplate power burner motor efficiency provided by the manufacturer,
= 0.50, an assumed default power burner efficiency if not provided by the manufacturer.
EffyHS = as defined in section 11.4.11.3 or 11.5.11.3 of ASHRAE 103–1993, and calculated on the basis of:
isolated combustion system installation, for non-weatherized warm air furnaces; or outdoor installation, for furnaces that are weatherized.
8,760 = total number of hours per year
4,600 = as defined in section 11.4.12 of ASHRAE 103–1993

10.4.1.2 For furnaces equipped with two-stage or step-modulating controls, the national average number of burner operating hours at the reduced operating mode (BOHR) is defined as:

BOHR = XR EM/QIN,R
Where:
XR = as defined in section 11.4.8.7 of ASHRAE 103–1993
EM = as defined in section 10.4.1.1 of this appendix
QIN,R = as defined in section 11.4.8.1.2 of ASHRAE 103–1993

10.4.1.3 For furnaces equipped with two-stage controls, the national average number of burner operating hours at the maximum operating mode (BOHH) is defined as:

BOHH = XH EM/QIN
Where:
XH = as defined in section 11.4.8.6 of ASHRAE 103–1993
EM = as defined in section 10.4.1.1 of this appendix
QIN = as defined in section 11.4.8.1.1 of ASHRAE 103–1993

10.4.1.4 For furnaces equipped with step-modulating controls, the national average number of burner operating hours at the modulating operating mode (BOHM) is defined as:

BOHM = XH EM/QIN,M
Where:
XH = as defined in section 11.4.8.6 of ASHRAE 103–1993
EM = as defined in section 10.4.1.1 of this appendix
QIN,M = QOUT,M/(EffySS,M/100)
QOUT,M = as defined in section 11.4.8.10 or 11.5.8.10 of ASHRAE 103–1993, as appropriate
EffySS,M = as defined in section 11.4.8.8 or 11.5.8.8 of ASHRAE 103–1993, as appropriate, in percent
100 = factor that accounts for percent

10.4.2 Average annual fuel energy consumption for gas or oil fueled furnaces. For furnaces equipped with single-stage controls, the average annual fuel energy consumption (EF) is expressed in Btu per year and defined as:

EF = BOHSS (QIN−QP) + 8,760 QP
Where:
BOHSS = as defined in section 10.4.1 of this appendix
QIN = as defined in section 11.2.8.1 of ASHRAE 103–1993
QP = as defined in section 11.2.11 of ASHRAE 103–1993
8,760 = as defined in section 10.4.1.1 of this appendix

10.4.2.1 For furnaces equipped with either two-stage or step modulating controls, EF is defined as:

EF = EM + 4,600 QP
Where:
EM = as defined in section 10.4.1.1 of this appendix
4,600 = as defined in section 11.4.12 of ASHRAE 103–1993
QP = as defined in section 11.2.11 of ASHRAE 103–1993

10.4.2.2 [Reserved]

10.4.3 Average annual auxiliary electrical energy consumption for gas or oil-fueled furnaces. For furnaces equipped with single-stage controls, the average annual auxiliary electrical consumption (EAE) is expressed in kilowatt-hours and defined as:

EAE = BOHSS (yP PE + yIG PEIG + yBE) + ESO
Where:
BOHSS = as defined in section 10.4.1 of this appendix
yP = as defined in section 10.4.1 of this appendix
PE = as defined in section 10.4.1 of this appendix
yIG = as defined in section 10.4.1 of this appendix
PEIG = as defined in section 10.4.1 of this appendix
y = as defined in section 10.4.1 of this appendix
BE = as defined in section 10.4.1 of this appendix
ESO = as defined in section 10.11 of this appendix

10.4.3.1 For furnaces equipped with two-stage controls, EAE is defined as:

EAE = BOHR (yP PER + yIG PEIG + yBER) + BOHH (yP PEH + yIG PEIG + y BEH) + ESO
Where:
BOHR = as defined in section 10.4.1.2 of this appendix
yP = as defined in section 10.4.1 of this appendix
PER = as defined in section 8.2 of this appendix and measured at the reduced fuel input rate
yIG = as defined in section 10.4.1 of this appendix
PEIG = as defined in section 10.4.1 of this appendix
y = as defined in section 10.4.1 of this appendix
BER = as defined in section 8.2 of this appendix and measured at the reduced fuel input rate
BOHH = as defined in section 10.4.1.3 of this appendix
PEH = as defined in section 8.2 of this appendix and measured at the maximum fuel input rate
BEH = as defined in section 8.2 of this appendix and measured at the maximum fuel input rate
ESO = as defined in section 10.11 of this appendix

10.4.3.2 For furnaces equipped with step-modulating controls, EAE is defined as:

EAE = BOHR (yP PER + yIG PEIG + y BER) + BOHM (yP PEH + yIG PEIG + y BEH) + ESO
Where:
BOHR = as defined in section 10.4.1.2 of this appendix
yP = as defined in section 10.4.1 of this appendix
PER = as defined in section 8.2 of this appendix and measured at the reduced fuel input rate
yIG = as defined in section 10.4.1 of this appendix
PEIG = as defined in section 10.4.1 of this appendix
y = as defined in section 10.4.1 of this appendix
BER = as defined in section 8.2 of this appendix and measured at the reduced fuel input rate
BOHM = as defined in 10.4.1.4 of this appendix
PEH = as defined in section 8.2 of this appendix and measured at the maximum fuel input rate
BEH = as defined in section 8.2 of this appendix and measured at the maximum fuel input rate
ESO = as defined in section 10.11 of this appendix

10.5 Average annual electric energy consumption for electric furnaces. For electric furnaces, the average annual electrical energy consumption (EE) is expressed in kilowatt-hours and defined as:

EE = 100 (2,080) (0.77) DHR/(3.412 AFUE) + ESO
Where:
100 = to express a percent as a decimal
2,080 = as defined in section 10.4.1 of this appendix
0.77 = as defined in section 10.4.1 of this appendix
DHR = as defined in section 10.4.1 of this appendix
3.412 = conversion factor from watt-hours to Btu
AFUE = as defined in section 11.1 of ASHRAE 103–1993, in percent, and calculated on the basis of:
isolated combustion system installation, for non-weatherized warm air furnaces; or
outdoor installation, for furnaces that are weatherized.
ESO = as defined in section 10.11 of this appendix.

10.6 Energy factor.

10.6.1 Energy factor for gas or oil furnaces. Calculate the energy factor, EF, for gas or oil furnaces defined as, in percent:

EF = (EF−4,600 (QP))(EffyHS)/(EF + 3,412 (EAE))
Where:
EF = average annual fuel consumption as defined in section 10.4.2 of this appendix
4,600 = as defined in section 11.4.12 of ASHRAE 103–1993
QP = pilot fuel input rate determined in accordance with section 9.2 of ASHRAE 103–1993 in Btu/h
EffyHS = annual fuel utilization efficiency as defined in sections 11.2.11, 11.3.11, 11.4.11 or 11.5.11 of ASHRAE 103–1993, in percent, and calculated on the basis of:
isolated combustion system installation, for non-weatherized warm air furnaces; or
outdoor installation, for furnaces that are weatherized.
3,412 = conversion factor from kW to Btu/h
EAE = as defined in section 10.4.3 of this appendix

10.6.2 Energy factor for electric furnaces. The energy factor, EF, for electric furnaces is defined as:

EF = AFUE
Where:
AFUE = annual fuel utilization efficiency as defined in section 10.4.3 of this appendix, in percent

10.7 Average annual energy consumption for furnaces located in a different geographic region of the United States and in buildings with different design heating requirements.

10.7.1 Average annual fuel energy consumption for gas or oil-fueled furnaces located in a different geographic region of the United States and in buildings with different design heating requirements. For gas or oil-fueled furnaces, the average annual fuel energy consumption for a specific geographic region and a specific typical design heating requirement (EFR) is expressed in Btu per year and defined as:

EFR = (EF−8,760 QP) (HLH/2,080) + 8,760 QP
Where:
EF = as defined in section 10.4.2 of this appendix
8,760 = as defined in section 10.4.1.1 of this appendix
QP = as defined in section 11.2.11 of ASHRAE 103–1993
HLH = heating load hours for a specific geographic region determined from the heating load hour map in Figure 1 of this appendix
2,080 = as defined in section 10.4.1 of this appendix

10.7.2 Average annual auxiliary electrical energy consumption for gas or oil-fueled furnaces located in a different geographic region of the United States and in buildings with different design heating requirements. For gas or oil-fueled furnaces, the average annual auxiliary electrical energy consumption for a specific geographic region and a specific typical design heating requirement (EAER) is expressed in kilowatt-hours and defined as:

EAER = (EAE−ESO) (HLH/2080) + ESOR
Where:
EAE = as defined in section 10.4.3 of this appendix
ESO = as defined in section 10.11 of this appendix
HLH = as defined in section 10.7.1 of this appendix
2,080 = as defined in section 10.4.1 of this appendix
ESOR = as defined in section 10.7.3 of this appendix.

10.7.3 Average annual electric energy consumption for electric furnaces located in a different geographic region of the United States and in buildings with different design heating requirements. For electric furnaces, the average annual electric energy consumption for a specific geographic region and a specific typical design heating requirement (EER) is expressed in kilowatt-hours and defined as:

EER = 100 (0.77) DHR HLH/(3.412 AFUE) + ESOR
Where:
100 = as defined in section 10.4.3 of this appendix
0.77 = as defined in section 10.4.1 of this appendix
DHR = as defined in section 10.4.1 of this appendix
HLH = as defined in section 10.7.1 of this appendix
3.412 = as defined in section 10.4.3 of this appendix
AFUE = as defined in section 10.4.3 of this appendix
ESOR = ESO as defined in section 10.11 of this appendix, except that in the equation for ESO, the term BOH is multiplied by the expression (HLH/2080) to get the appropriate regional accounting of standby mode and off mode loss.

10.8 Annual energy consumption for mobile home furnaces

10.8.1 National average number of burner operating hours for mobile home furnaces (BOHSS). BOHSS is the same as in section 10.4.1 of this appendix, except that the value of EffyHS in the calculation of the burner operating hours, BOHSS, is calculated on the basis of a direct vent unit with system number 9 or 10.

10.8.2 Average annual fuel energy for mobile home furnaces (EF). EF is same as in section 10.4.2 of this appendix except that the burner operating hours, BOHSS, is calculated as specified in section 10.8.1 of this appendix.

10.8.3 Average annual auxiliary electrical energy consumption for mobile home furnaces (EAE). EAE is the same as in section 10.4.3 of this appendix, except that the burner operating hours, BOHSS, is calculated as specified in section 10.8.1 of this appendix.

10.9 Calculation of sales weighted average annual energy consumption for mobile home furnaces. To reflect the distribution of mobile homes to geographical regions with average HLHMHF values different from 2,080, adjust the annual fossil fuel and auxiliary electrical energy consumption values for mobile home furnaces using the following adjustment calculations.

10.9.1 For mobile home furnaces, the sales weighted average annual fossil fuel energy consumption is expressed in Btu per year and defined as:

EF,MHF = (EF−8,760 QP) HLHMHF/2,080 + 8,760 QP
Where:
EF = as defined in section 10.8.2 of this appendix
8,760 = as defined in section 10.4.1.1 of this appendix
QP = as defined in section 10.2 of this appendix
HLHMHF = 1880, sales weighted average heating load hours for mobile home furnaces
2,080 = as defined in section 10.4.1 of this appendix

10.9.2 For mobile home furnaces, the sales-weighted-average annual auxiliary electrical energy consumption is expressed in kilowatt-hours and defined as:

EAE,MHF = EAE HLHMHF/2,080
Where:
EAE = as defined in section 10.8.3 of this appendix
HLHMHF = as defined in section 10.9.1 of this appendix
2,080 = as defined in section 10.4.1 of this appendix

10.10 [Reserved]

10.11 Average annual electrical standby mode and off mode energy consumption. Calculate the annual electrical standby mode and off mode energy consumption (ESO) in kilowatt-hours, defined as:

ESO = (PW,SB (4160−BOH) + 4600 PW,OFF) K
Where:
PW,SB = furnace standby mode power, in watts, as measured in section 8.10.1 of this appendix
4,160 = average heating season hours per year
BOH = total burner operating hours as calculated in section 10.4 of this appendix for gas or oil-fueled furnaces. Where for gas or oil-fueled furnaces equipped with single-stage controls, BOH = BOHSS; for gas or oil-fueled furnaces equipped with two-stage controls, BOH = (BOHR + BOHH); and for gas or oil-fueled furnaces equipped with step-modulating controls, BOH = (BOHR + BOHM). For electric furnaces, BOH = 100(2080)(0.77)DHR/(Ein 3.412(AFUE))
4,600 = as defined in section 11.4.12 of ASHRAE 103–1993
PW,OFF = furnace off mode power, in watts, as measured in section 8.10.2 of this appendix
K = 0.001 kWh/Wh, conversion factor from watt-hours to kilowatt-hours
Where:
100 = to express a percent as a decimal
2,080 = as defined in section 10.4.1 of this appendix
0.77 = as defined in section 10.4.1 of this appendix
DHR = as defined in section 10.4.1 of this appendix
Ein = steady-state electric rated power, in kilowatts, from section 9.3 of ASHRAE 103–1993
3.412 = as defined in section 10.4.3 of this appendix
AFUE = as defined in section 11.1 of ASHRAE 103–1993 in percent
[88 FR 15538, Mar. 13, 2023]
1. Definitions:

Active electrical power means the maximum electrical power consumption in active mode for an electric pool heater.

Active mode means the condition during the pool heating season in which the pool heater is connected to the power source, and the main burner, electric resistance element, or heat pump is activated to heat pool water.

Coefficient of performance (COP), as applied to heat pump pool heaters, means the ratio of heat output in kW to the total power input in kW.

Electric heat pump pool heater means an appliance designed for heating nonpotable water and employing a compressor, water-cooled condenser, and outdoor air coil.

Electric resistance pool heater means an appliance designed for heating nonpotable water and employing electric resistance heating elements.

Fossil fuel-fired pool heater means an appliance designed for heating nonpotable water and employing gas or oil burners.

Hybrid pool heater means an appliance designed for heating nonpotable water and employing both a heat pump (compressor, water-cooled condenser, and outdoor air coil) and a fossil fueled burner as heating sources.

Input capacity means the maximum fuel input rate for a fossil fuel-fired pool heater.

Off mode means the condition during the pool non-heating season in which the pool heater is connected to the power source, and neither the main burner, nor the electric resistance elements, nor the heat pump is activated, and the seasonal off switch, if present, is in the “off” position.

Output capacity for an electric pool or spa heater means the maximum rate at which energy is transferred to the water.

Seasonal off switch means a switch that results in different energy consumption in off mode as compared to standby mode.

Standby mode means the condition during the pool heating season in which the pool heater is connected to the power source, and neither the main burner, nor the electric resistance elements, nor the heat pump is activated.

2. Test method.

2.1 Active mode.

2.1.1 Fossil fuel-fired pool heaters. The test method for testing fossil fuel-fired pool heaters in active mode is as specified in section 2.10 of ANSI Z21.56 (incorporated by reference, see § 430.3), with the following additional clarifications.

1. Burner input rate is adjusted as specified in section 2.3.3 of ANSI Z21.56,

2. Equilibrium is defined as in section 9.1.3 of ASHRAE 146 (incorporated by reference; see § 430.3)

3. Units are only to be tested using a recirculating loop and a pump if: the use of the recirculating loop and pump are listed as required; a minimum flow rate is specified in the installation or operation manual provided with the unit; the pump is packaged with the unit by the manufacturer; or such use is required for testing.

4. A water temperature rise of less than 40 °F is allowed only as specified in the installation or operation manual(s) provided with the unit.

2.1.2 Electric resistance pool heaters. The test method for testing electric resistance pool heaters in active mode is as specified in ASHRAE 146 (incorporated by reference; see § 430.3).

2.1.3 Electric heat pump pool heaters. The test method for testing electric heat pump pool heaters in active mode is as specified in AHRI 1160 (incorporated by reference; see § 430.3), which references ASHRAE 146 (incorporated by reference; see § 430.3).

2.1.4 Hybrid pool heaters. [Reserved]

2.2 Standby mode. The test method for testing the energy consumption of pool heaters in standby mode is as described in sections 3 through 5 of this appendix.

2.3 Off mode.

2.3.1 Pool heaters with a seasonal off switch. For pool heaters with a seasonal off switch, no off mode test is required.

2.3.2 Pool heaters without a seasonal off switch. For pool heaters without a seasonal off switch, the test method for testing the energy consumption of the pool heater is as described in sections 3 through 5 of this appendix.

3. Test conditions.

3.1 Active mode.

3.1.1 Fossil fuel-fired pool heaters. Establish the test conditions specified in section 2.10 of ANSI Z21.56 (incorporated by reference; see § 430.3).

3.1.2 Electric resistance pool heaters. Establish the test conditions specified in section 9.1.4 of ASHRAE 146 (incorporated by reference; see § 430.3).

3.1.3 Electric heat pump pool heaters. Establish the test conditions specified in section 5 of AHRI 1160. The air temperature surrounding the unit shall be at the “High Air Temperature—Mid Humidity (63% RH)” level specified in section 6 of AHRI 1160 (incorporated by reference, see § 430.3) (80.6 °F [27.0 °C] Dry-Bulb, 71.2 °F [21.8 °C]).

3.1.4 Hybrid pool heaters. [Reserved]

3.2 Standby mode and off mode. After completing the active mode tests described in sections 3.1 and 4.1 of this appendix, reduce the thermostat setting to a low enough temperature to put the pool heater into standby mode. Reapply the energy sources and operate the pool heater in standby mode for 60 minutes.

4. Measurements

4.1 Active mode

4.1.1 Fossil fuel-fired pool heaters. Measure the quantities delineated in section 2.10 of ANSI Z21.56 (incorporated by reference; see § 430.3). The measurement of energy consumption for oil-fired pool heaters in Btu is to be carried out in appropriate units (e.g., gallons).

4.1.2 Electric resistance pool heaters. Measure the quantities delineated in section 9.1.4 of ASHRAE 146 (incorporated by reference; see § 430.3) during and at the end of the 30-minute period when water is flowing through the pool heater.

4.1.3 Electric heat pump pool heaters. Measure the quantities delineated in section 9.1.1 and Table 2 of ASHRAE 146 (incorporated by reference; see § 430.3). Record the elapsed time, tHP, from the start of electric power metering to the end, in minutes.

4.1.4 Hybrid pool heaters. [Reserved]

4.2 Standby mode. For all pool heaters, record the average electric power consumption during the standby mode test, PW,SB, in W, in accordance with section 5 of IEC 62301 (incorporated by reference; see § 430.3). For fossil fuel-fired pool heaters, record the fossil fuel energy consumption during the standby test, Qp, in Btu. (Milli-volt electrical consumption need not be considered in units so equipped.) Ambient temperature and voltage specifications in section 4.1 of this appendix shall apply to this standby mode testing. Round the recorded standby power (PW,SB) to the second decimal place, and for loads greater than or equal to 10 W, record at least three significant figures.

4.3 Off mode.

4.3.1 Pool heaters with a seasonal off switch. For pool heaters with a seasonal off switch, the average electric power consumption during the off mode, PW,OFF = 0, and the fossil fuel energy consumed during the off mode, Qoff = 0.

4.3.2 Pool heaters without a seasonal off switch. For all pool heaters without a seasonal off switch, record the average electric power consumption during the standby/off mode test, PW,OFF = PW,SB, in W, in accordance with section 5 of IEC 62301 (incorporated by reference; see § 430.3). For fossil fuel-fired pool heaters without a seasonal off switch, record the fossil fuel energy consumption during the off mode test, Qoff (= Qp), in Btu. (Milli-volt electrical consumption need not be considered in units so equipped.) Ambient temperature and voltage specifications in section 4.1 of this appendix shall apply to this off mode testing. Round the recorded off mode power (PW,OFF) to the second decimal place, and for loads greater than or equal to 10 W, record at least three significant figures.

5. Calculations.

5.1 Thermal efficiency.

5.1.1 Fossil fuel-fired pool heaters. Calculate the thermal efficiency, Et (expressed as a percent), as specified in section 2.10 of ANSI Z21.56 (incorporated by reference; see § 430.3). The expression of fuel consumption for oil-fired pool heaters shall be in Btu.

5.1.2 Electric resistance pool heaters. Calculate the thermal efficiency, Et (expressed as a percent), as specified in section 11.1 of ASHRAE 146 (incorporated by reference; see § 430.3).

5.1.3 Electric heat pump pool heaters. Calculate the COP according to section 11.1 of ASHRAE 146. Calculate the thermal efficiency, Et (expressed as a percent): Et = COP.

5.1.4 Hybrid pool heaters. [Reserved]

5.2 Average annual fossil fuel energy for pool heaters. For electric resistance and electric heat pump pool heaters, the average annual fuel energy for pool heaters, EF = 0.

For fossil fuel-fired pool heaters, the average annual fuel energy for pool heaters, EF, is defined as:

EF = BOH QIN + (POH−BOH) QPR + (8760 − POH) Qoff,R
Where:
BOH = average number of burner operating hours = 104 h,
POH = average number of pool operating hours = 4,464 h,
QIN = input capacity, in Btu/h, calculated as the quantity CF x Q x H in the equation for thermal efficiency in section 2.10.1 of ANSI Z21.56 (incorporated by reference; see § 430.3) and divided by 0.5 h (For electric resistance and electric heat pump pool heaters, QIN = 0.),
QPR = average energy consumption rate of continuously operating pilot light, if employed, = (QP/1 h),
QP = energy consumption of continuously operating pilot light, if employed, as measured in section 4.2 of this appendix, in Btu,
8760 = number of hours in one year,
Qoff,R = average off mode fossil fuel energy consumption rate = Qoff/(1 h), and
Qoff = off mode energy consumption as defined in section 4.3 of this appendix.

5.3 Average annual electrical energy consumption for pool heaters. The average annual electrical energy consumption for pool heaters, EAE, is expressed in Btu and defined as:

(1) EAE = EAE,active + EAE,standby,off
(2) EAE,active = BOH * PE
(3) EAE,standby,off = (POH−BOH) PW,SB(Btu/h) + (8760−POH) PW,OFF(Btu/h)
where:
EAE,active = electrical consumption in the active mode,
EAE,standby,off = auxiliary electrical consumption in the standby mode and off mode,
PE = active electrical power, calculated as:
= 2Ec, for fossil fuel-fired heaters tested according to section 2.10.1 of ANSI Z21.56 and for electric resistance pool heaters, in Btu/h,
= 3.412 PEaux,rated, for fossil fuel-fired heaters tested according to section 2.10.2 of ANSI Z21.56, in Btu/h,
= Ec,HP * (60/tHP), for electric heat pump pool heaters, in Btu/h.
Ec = electrical consumption in Btu per 30 min. This includes the electrical consumption (converted to Btus) of the pool heater and, if present, a recirculating pump during the 30-minute thermal efficiency test. The 30-minute thermal efficiency test is defined in section 2.10.1 of ANSI Z21.56 for fossil fuel-fired pool heaters and section 9.1.4 of ASHRAE 146 (incorporated by reference; see § 430.3) for electric resistance pool heaters. 2 = conversion factor to convert unit from per 30 min. to per h.
PEaux,rated = nameplate rating of auxiliary electrical equipment of heater, in Watts
Ec,HP = electrical consumption of the electric heat pump pool heater (converted to equivalent unit of Btu), including the electrical energy to the recirculating pump if used, during the thermal efficiency test, as defined in section 9.1 of ASHRAE 146, in Btu.
tHP = elapsed time of data recording during the thermal efficiency test on electric heat pump pool heater, as defined in section 9.1 of ASHRAE 146, in minutes.
BOH = as defined in section 5.2 of this appendix,
POH = as defined in section 5.2 of this appendix,
PW,SB (Btu/h) = electrical energy consumption rate during standby mode expressed in Btu/h = 3.412 PW,SB, Btu/h,
PW,SB = as defined in section 4.2 of this appendix,
PW,OFF (Btu/h) = electrical energy consumption rate during off mode expressed in Btu/h = 3.412 PW,OFF, Btu/h, and
PW,OFF = as defined in section 4.3 of this appendix.

5.4 Integrated thermal efficiency.

5.4.1 Calculate the seasonal useful output of the pool heater as:

EOUT = BOH[(Et/100)(QIN + PE)]
where:
BOH = as defined in section 5.2 of this appendix,
Et = thermal efficiency as defined in section 5.1 of this appendix,
QIN = as defined in section 5.2 of this appendix,
PE = as defined in section 5.3 of this appendix, and
100 = conversion factor, from percent to fraction.

5.4.2 Calculate the annual input to the pool heater as:

EIN = EF + EAE
where:
EF = as defined in section 5.2 of this appendix, and
EAE = as defined in section 5.3 of this appendix.

5.4.3 Calculate the pool heater integrated thermal efficiency (TEI) (in percent).

TEI = 100(EOUT/EIN)
where:
EOUT = as defined in section 5.4.1 of this appendix,
EIN = as defined in section 5.4.2 of this appendix, and
100 = conversion factor, from fraction to percent.

5.5 Output capacity for electric pool heaters.

5.5.1 Calculate the output capacity of an electric heat pump pool heater as:

QOUT,HP = k * W * (Tohp−Tihp) * (60/tHP)
where k is the specific heat of water, W is the mass of water collected during the test, Tohp is the average outlet water temperature during the standard rating test, Tihp is the average inlet water temperature during the standard rating test, all as defined in section 11.2 of ASHRAE 146, and tHP is the elapsed time in minutes of data recording during the thermal efficiency test on electric heat pump pool heater, as defined in section 9.1 of ASHRAE 146.

5.5.2 Calculate the output capacity of an electric resistance pool heater as:

QOUT,ER = k * W * (Tmo−Tmi) * (60/30)
where k is the specific heat of water, W is the mass of water collected during the test, Tmo is the average outlet water temperature recorded during the primary test, and Tmi is the average inlet water temperature record during the primary test, all as defined in section 11.1 of ASHRAE 146, and 60/30 is the conversion factor to convert unit from per 30 minutes to per hour.
[80 FR 813, Jan. 6, 2015, as amended at 88 FR 34703, May 30, 2023]
Where:
TSH = typical average outdoor temperature at which a boiler starts operating, 65 °F
TOA,T = the typical outdoor design temperature, 5 °F
α = oversize factor, as defined in 11.4.8.2
QIN = steady-state nameplate maximum fuel input rate
QIN,R = steady-state reduced input fuel input rate
LS,SSR = average sensible heat loss at steady state, reduced input operation
LS,SS = average sensible heat loss at steady state, maximum input operation

10.2 National average burner operating hours, average annual fuel energy consumption, and average annual auxiliary electrical energy consumption for gas or oil boilers.

10.2.1 National average number of burner operating hours.

10.2.1.1 For boilers equipped with single-stage controls, the national average number of burner operating hours is defined as:

BOHSS = 2,080 (0.77) (A) [(QOUT/1000)/(1+α)]−2,080 (B)
Where:
2,080 = national average heating load hours
0.77 = adjustment factor to adjust the calculated design heating requirement and heating load hours to the actual heating load experienced by the heating system
A = 100,000/[341,200 (yP PE + yIG PEIG + y BE) + (QIN−QP) EffyHS], for forced draft unit, indoors
= 100,000/[341,200 (yP PE (1−Effmotor) + yIG PEIG + y BE) + (QIN−QP) EffyHS], for induced draft unit, indoors, and
QOUT = value as defined in section 11.2.8.1 of ASHRAE 103–2017.
α = value as defined in section 11.2.8.2 of ASHRAE 103–2017.
B = 2 QP (EffyHS) (A)/100,000
Where:
Effmotor = nameplate power burner motor efficiency provided by the manufacturer,
= 0.50, an assumed default power burner efficiency if not provided by the manufacturer.
100,000 = factor that accounts for percent and kBtu
yP = ratio of induced or forced draft blower on-time to average burner on-time, as follows:
1 for units without post-purge;
1 + (tP/tON) for single stage boilers with post purge; or
PE = all electrical power related to burner operation at full load steady-state operation, including electrical ignition device if energized, controls, gas valve or oil control valve, draft inducer, and boiler pump, as determined in section 8.2 of this appendix.
yIG = ratio of burner interrupted ignition device on-time to average burner on-time, as follows:
0 for burners not equipped with interrupted ignition device;
(tIG/tON) for single stage boilers
PEIG = electrical input rate to the interrupted ignition device on burner (if employed), as defined in section 8.3 of this appendix
y = ratio of pump on-time to average burner on-time, as follows:
1 for boilers without a pump delay;
1 + (t +/tON) for single-stage boilers with pump delay;
BE = circulating water pump electrical energy input rate at full-load steady-state operation as defined in section 8.2 of this appendix.
tP = post-purge time as defined in section 8.5 of this appendix
= 0 if tP is equal to or less than 30 seconds
tIG = on-time of the burner interrupted ignition device, as defined in section 8.3 of this appendix
QIN = as defined in section 11.2.8.1 of ASHRAE 103–2017
QP = as defined in section 11.2.11 of ASHRAE 103–2017
EffyHS = as defined in section 11.2.11 (non-condensing systems) or section 11.3.11.3 (condensing systems) of ASHRAE 103–2017, percent, and calculated on the basis of:
indoor installation, for non-weatherized boilers; or outdoor installation, for boilers that are weatherized.
2 = ratio of the average length of the heating season in hours to the average heating load hours
t + = delay time between burner shutoff and the pump shutoff measured as defined in section 8.5 of this appendix.
tON = value as defined in Table 7 of ASHRAE 103–2017.

10.2.1.2 For boilers equipped with two-stage or step-modulating controls, the national average number of burner operating hours at the reduced operating mode (BOHR) is defined as:

BOHR = XR (2080)(0.77)[(QOUT/1,000)/(1+α)](AR)−2080(BR)
Where:
XR = as defined in section 11.4.8.6 of SHRAE 103–2017
2080 = as defined in section 10.2.1.1 of this appendix
0.77 = as defined in section 10.2.1.1 of this appendix
QOUT = as defined in section 11.4.8.1.1 or 11.5.8.1.1 of ASHRAE 103–2017
α = as defined in section 11.4.8.2 of ASHRAE 103–2017
AR = 100,000/[341,200(yP,RPER + yIG,RPEIG + yRBER) + (QIN,R−QP) EffyU,R] for forced draft unit, indoors; and
= 100,000/[341,200(yP,RPER (1−Effmotor) + yIG,RPEIG + yRBER) + (QIN,R−QP) EffyU,R] for induced draft unit, indoors
BR = 2QP (EffyU,R) (AR)/100,000
100,000 = conversion factor accounting for percent and 1,000 Btu/kBtu
341,200 = conversion factor accounting for percent and 3412 Btu/h/kW
yP,R = 1 + (tp/tON,R) for two-stage and step modulating boilers with post purge
PER = as defined in section 8.2 of this appendix and measured at the reduced fuel input rate
yIG,R = tIG/tON,R
PEIG = as defined in section 8.3 of this appendix
yR = 1 + (t +)/tON,R for two-stage and step modulating boilers with fan delay
BER = as defined in section 8.2 of this appendix and measured at the reduced fuel input rate
QIN,R = as defined in section 11.4.8.1.2 of ASHRAE 103–2017
QP = as defined in section 11.4.12 of ASHRAE 103–2017
EffyU,R = as defined in section 11.4.11.1 or 11.5.11.1 of ASHRAE 103–2017, and calculated on the basis of:
indoor installation, for non-weatherized boilers; or
outdoor installation, for boilers that are weatherized.
Effmotor = nameplate power burner motor efficiency provided by the manufacturer,
= 0.50, an assumed default power burner efficiency if not provided by the manufacturer.

10.2.1.3 For boilers equipped with two-stage controls, the national average number of burner operating hours at the maximum operating mode (BOHH) is defined as:

BOHH = XH (2080)(0.77)[(QOUT/1,000)/(1+α)](AH)—2080(BH)
Where:
XH = as defined in section 11.4.8.5 of SHRAE 103–2017
2080 = as defined in section 10.2.1.1 of this appendix
0.77 = as defined in section 10.2.1.1 of this appendix
QOUT = as defined in section 11.4.8.1.1 or 11.5.8.1.1 ofASHRAE 103–2017
α = as defined in section 11.4.8.2 of ASHRAE 103–2017
AH = 100,000/[341,200(yP,HPEH + yIG,HPEIG + yHBEH) + (QIN,H—QP) EffyU,H] for forced draft unit, indoors; and
= 100,000/[341,200(yP,HPEH (1—Effmotor) + yIG,HPEIG + yHBEH) + (QIN,H—QP) EffyU,H] for induced draft unit, indoors
BH = 2QP (EffyU,H) (AH)/100,000
100,000 = conversion factor accounting for percent and 1,000 Btu/kBtu
341,200 = conversion factor accounting for percent and 3412 Btu/h/kW
yP,H = 1 + (tp/tON,H) for two-stage and step modulating boilers with post purge
PEH = as defined in section 8.2 of this appendix and measured at the maximum fuel input rate
yIG,H = tIG/tON,H
PEIG = as defined in section 8.3 of this appendix
yH = 1 + (t +)/tON,H for two-stage and step modulating boilers with fan delay
BEH = as defined in section 8.2 of this appendix and measured at the maximum fuel input rate
QIN,H = as defined in section 11.4.8.1.1 of ASHRAE 103–2017
QP = as defined in section 11.4.12 of ASHRAE 103–2017
EffyU,H = as defined in section 11.4.11.2 or 11.5.11.2 of ASHRAE 103–2017, and calculated on the basis of:
indoor installation, for non-weatherized boilers; or
outdoor installation, for boilers that are weatherized.
Effmotor = nameplate power burner motor efficiency provided by the manufacturer,
= 0.50, an assumed default power burner efficiency if not provided by the manufacturer.

10.2.1.4 For boilers equipped with step-modulating controls, the national average number of burner operating hours at the modulating operating mode (BOHM) is defined as:

BOHM = XH (2080)(0.77)[(QOUT/1,000)/(1+α)](AM)—2080(BM)
Where:
XH = as defined in section 11.4.8.5 of ASHRAE 103–2017
2080 = as defined in section 10.2.1.1 of this appendix
0.77 = as defined in section 10.2.1.1 of this appendix
QOUT = as defined in section 11.4.8.1.1 or 11.5.8.1.1 of ASHRAE 103–2017
α = as defined in section 11.4.8.2 of ASHRAE 103–2017
AM = 100,000/[341,200(yP,HPEH + yIG,HPEIG + yHBEH) + (QIN,M—QP) EffyU,M] for forced draft unit, indoors; and
= 100,000/[341,200(yP,HPEH (1—Effmotor) + yIG,HPEIG + yHBEH) + (QIN,M—QP) EffyU,M] for induced draft unit, indoors
BM = 2QP (EffyU,M) (AM)/100,000
100,000 = conversion factor accounting for percent and 1,000 Btu/kBtu
341,200 = conversion factor accounting for percent and 3412 Btu/h/kW
yP,H = 1 + (tp/tON,H) for two-stage and step modulating boilers with post purge
PEH = as defined in section 8.2 of this appendix and measured at the maximum fuel input rate
yIG,H = tIG/tON,H
PEIG = as defined in section 8.3 of this appendix
yH = 1 + (t +)/tON,H for two-stage and step modulating boilers with fan delay
BEH = as defined in section 8.2 of this appendix and measured at the maximum fuel input rate
QIN,M = (100)(QOUT,M/EffySS,M)
QOUT,M = as defined in section 11.4.8.9 or 11.5.8.9 of ASHRAE 103–2017
EffySS,M = value as defined in section 11.4.8.7 or 11.5.8.7 of ASHRAE 103–2017
QP = as defined in section 11.4.12 of ASHRAE 103–2017
EffyU,M = as defined in section 11.4.9.2.3 or 11.5.9.2.3 of ASHRAE 103–2017, and calculated on the basis of:
indoor installation, for non-weatherized boilers; or
outdoor installation, for boilers that are weatherized.
Effmotor = nameplate power burner motor efficiency provided by the manufacturer,
= 0.50, an assumed default power burner efficiency if not provided by the manufacturer.

10.2.2 Average annual fuel energy consumption for gas or oil fueled boilers.

10.2.2.1 For boilers equipped with single-stage controls, the average annual fuel energy consumption (EF) is expressed in Btu per year and defined as:

EF = BOHSS (QIN − QP) + 8,760 QP
Where:
BOHSS = as defined in section 10.2.1.1 of this appendix
QIN = as defined in section 11.2.8.1 of ASHRAE 103–2017
QP = as defined in section 11.2.11 of ASHRAE 103–2017
8,760 = total number of hours per year.

10.2.2.2 For boilers equipped with either two-stage or step modulating controls, EF is defined as follows. For two-stage control:

EF = (BOHH)(QIN) + (BOHR)(QIN,R) + [8760 − (BOHH + BOHR)]QP

For step-modulating control:

EF = (BOHM)(QIN,M) + (BOHR)(QIN,R) + [8760 − (BOHH + BOHR)]QP
Where:
BOHH = as defined in section 10.2.1.3 of this appendix
BOHR = as defined in section 10.2.1.2 of this appendix
BOHM = as defined in section 10.2.1.4 of this appendix
QIN = as defined in section 11.2.8.1 of ASHRAE 103–2017
QIN,R = as defined in section 11.4.8.1.2 of ASHRAE 103–2017
QIN,M = as defined in section 10.2.1.4 of this appendix
8,760 = total number of hours per year
QP = as defined in section 11.2.11 of ASHRAE 103–2017.

10.2.3 Average annual auxiliary electrical energy consumption for gas or oil-fueled boilers.

10.2.3.1 For boilers equipped with single-stage controls, the average annual auxiliary electrical consumption (EAE) is expressed in kilowatt-hours and defined as:

EAE = BOHSS (yP PE + yIG PEIG + yBE) + ESO
Where:
BOHSS = as defined in section 10.2.1.1 of this appendix
yP = as defined in section 10.2.1.1 of this appendix
PE = as defined in section 10.2.1.1 of this appendix
yIG = as defined in section 10.2.1.1 of this appendix
PEIG = as defined in section 10.2.1.1 of this appendix
y = as defined in section 10.2.1.1 of this appendix
BE = as defined in section 10.2.1.1 of this appendix
ESO = as defined in section 10.7 of this appendix.

10.2.3.2 For boilers equipped with two-stage controls, EAE is defined as:

EAE = BOHR (yP,R PER + yIG,R PEIG + yRBER) + BOHH (yP,H PEH + yIG,H PEIG + yHBEH) + ESO
Where:
BOHR = as defined in section 10.2.1.2 of this appendix
yP,R = as defined in section 10.2.1.2 of this appendix
PER = as defined in section 8.2 of this appendix and measured at the reduced fuel input rate
yIG,R = as defined in section 10.2.1.2 of this appendix
PEIG = as defined in section 10.2.1.1 of this appendix
yR = as defined in section 10.2.1.2 of this appendix
BER = as defined in section 8.2 of this appendix and measured at the reduced fuel input rate
BOHH = as defined in section 10.2.1.3 of this appendix
PEH = as defined in section 8.2 of this appendix and measured at the maximum fuel input rate
yP,H = as defined in section 10.2.1.3 of this appendix
yIG,H = as defined in section 10.2.1.3 of this appendix
BEH = as defined in section 8.2 of this appendix and measured at the maximum fuel input rate
yH = as defined in section 10.2.1.3 of this appendix
ESO = as defined in section 10.7 of this appendix.

10.2.3.3 For boilers equipped with step-modulating controls, EAE is defined as:

EAE = BOHR (yP,R PER + yIG,R PEIG + yR BER) + BOHM (yP,H PEH + yIG,H PEIG + yHBEH) + ESO
Where:
BOHR = as defined in section 10.2.1.2 of this appendix
yP,R = as defined in section 10.2.1.2 of this appendix
PER = as defined in section 8.2 of this appendix and measured at the reduced fuel input rate
yIG,R = as defined in section 10.2.1.2 of this appendix
PEIG = as defined in section 10.2.1 of this appendix
yR = as defined in section 10.2.1.2 of this appendix
BER = as defined in section 8.2 of this appendix and measured at the reduced fuel input rate
BOHM = as defined in 10.2.1.4 of this appendix
yP,H = as defined in section 10.2.1.3 of this appendix
PEH = as defined in section 8.2 of this appendix and measured at the maximum fuel input rate
yIG,H = as defined in section 10.2.1.3 of this appendix
yH = as defined in section 10.2.1.3 of this appendix
BEH = as defined in section 8.2 of this appendix and measured at the maximum fuel input rate
ESO = as defined in section 10.7 of this appendix.

10.3 Average annual electric energy consumption for electric boilers. For electric boilers, the average annual electrical energy consumption (EE) is expressed in kilowatt-hours and defined as:

EE = 100 (2,080) (0.77) [QOUT/(1+α)]/(3412 AFUE) + ESO
Where:
100 = to express a percent as a decimal
2,080 = as defined in section 10.2.1.1 of this appendix
0.77 = as defined in section 10.2.1.1 of this appendix
QOUT = as defined in section 11.2.8 of ASHRAE 103–2017
α = as defined in section 11.2.8.2 of ASHRAE 103–2017
3412 = conversion factor from kilowatt-hours to Btu
AFUE = as defined in section 11.1 of ASHRAE 103–2017, in percent, and calculated on the basis of:
indoor installation, for non-weatherized boilers; or
outdoor installation, for boilers that are weatherized.
ESO = as defined in section 10.7 of this appendix.

10.4 Energy factor.

10.4.1 Energy factor for gas or oil boilers. Calculate the energy factor, EF, for gas or oil boilers defined as, in percent:

EF = (EF − 4,600 (QP))(EffyHS)/(EF + 3,412 (EAE))
Where:
EF = average annual fuel consumption as defined in section 10.2.2 of this appendix
4,600 = as defined in section 11.4.12 of ASHRAE 103–2017
QP = pilot fuel input rate determined in accordance with section 9.2 of ASHRAE 103–2017 in Btu/h
EffyHS = annual fuel utilization efficiency as defined in sections 11.2.11, 11.3.11, 11.4.11 or 11.5.11 of ASHRAE 103–2017, in percent, and calculated on the basis of:
indoor installation, for non-weatherized boilers; or
outdoor installation, for boilers that are weatherized.
3,412 = conversion factor from kW to Btu/h
EAE = as defined in section 10.2.3 of this appendix.

10.4.2 Energy factor for electric boilers. The energy factor, EF, for electric boilers is defined as:

EF = AFUE
Where:
AFUE = annual fuel utilization efficiency as defined in section 10.3 of this appendix, in percent.

10.5 Average annual energy consumption for boilers located in a different geographic region of the United States and in buildings with different design heating requirements.

10.5.1 Average annual fuel energy consumption for gas or oil-fueled boilers located in a different geographic region of the United States and in buildings with different design heating requirements. For gas or oil-fueled boilers, the average annual fuel energy consumption for a specific geographic region and a specific typical design heating requirement (EFR) is expressed in Btu per year and defined as:

EFR = (EF − 8,760 QP) (HLH/2,080) + 8,760 QP
Where:
EF = as defined in section 10.2.2 of this appendix
8,760 = as defined in section 10.2.2 of this appendix
QP = as defined in section 11.2.11 of ASHRAE 103–2017
HLH = heating load hours for a specific geographic region determined from the heating load hour map in Figure 1 of this appendix
2,080 = as defined in section 10.2.1.1 of this appendix.

10.5.2 Average annual auxiliary electrical energy consumption for gas or oil-fueled boilers located in a different geographic region of the United States and in buildings with different design heating requirements. For gas or oil-fueled boilers, the average annual auxiliary electrical energy consumption for a specific geographic region and a specific typical design heating requirement (EAER) is expressed in kilowatt-hours and defined as:

EAER = (EAE−ESO) (HLH/2080) + ESOR
Where:
EAE = as defined in section 10.2.3 of this appendix
ESO = as defined in section 10.7 of this appendix
HLH = as defined in section 10.5.1 of this appendix
2,080 = as defined in section 10.2.1.1 of this appendix
ESOR = as defined in section 10.5.3 of this appendix.

10.5.3 Average annual electric energy consumption for electric boilers located in a different geographic region of the United States and in buildings with different design heating requirements. For electric boilers, the average annual electric energy consumption for a specific geographic region and a specific typical design heating requirement (EER) is expressed in kilowatt-hours and defined as:

EER = 100 (0.77) [QOUT/(1+α)] HLH/(3.412 AFUE) + ESOR
Where:
100 = as defined in section 10.2.3 of this appendix
0.77 = as defined in section 10.2.1.1 of this appendix
QOUT = as defined in section 11.2.8.1 of ASHRAE 103–2017
α = as defined in section 11.2.8.2 of ASHRAE 103–2017
HLH = as defined in section 10.5.1 of this appendix
3.412 = as defined in section 10.2.3 of this appendix
AFUE = as defined in section 10.2.3 of this appendix
ESOR = ESO as defined in section 10.7 of this appendix, except that in the equation for ESO, the term BOH is multiplied by the expression (HLH/2080) to get the appropriate regional accounting of standby mode and off mode loss.

10.6 [Reserved]

10.7 Average annual electrical standby mode and off mode energy consumption. Calculate the annual electrical standby mode and off mode energy consumption (ESO) in kilowatt-hours, defined as:

ESO = (PW,SB (4160−BOH) + 4600 PW,OFF) K
Where:
PW,SB = boiler standby mode power, in watts, as measured in section 8.9.1 of this appendix
4,160 = average heating season hours per year
BOH = total burner operating hours as calculated in section 10.2 of this appendix for gas or oil-fueled boilers. Where for gas or oil-fueled boilers equipped with single-stage controls, BOH = BOHSS; for gas or oil-fueled boilers equipped with two-stage controls, BOH = (BOHR + BOHH); and for gas or oil-fueled boilers equipped with step-modulating controls, BOH = (BOHR + BOHM). For electric boilers, BOH = 100(2080)(0.77)[QOUT/(1+α)]/(Ein 3412(AFUE))
4,600 = as defined in section 11.4.12 of ASHRAE 103–2017
PW,OFF = boiler off mode power, in watts, as measured in section 8.9.2 of this appendix
K = 0.001 kWh/Wh, conversion factor from watt-hours to kilowatt-hours
Where:
100 = to express a percent as a decimal
2,080 = as defined in section 10.2.1.1 of this appendix
0.77 = as defined in section 10.2.1.1 of this appendix
QOUT = as defined in section 11.2.8 of ASHRAE 103–2017
α = as defined in section 11.2.8.2 of ASHRAE 103–2017
Ein = steady-state electric rated power, in kilowatts, from section 9.3 of ASHRAE 103–2017
3412 = as defined in section 10.3 of this appendix
AFUE = as defined in section 11.1 of ASHRAE 103–2017 in percent.
[88 FR 15547, Mar. 13, 2023]

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