10 CFR 429.17 - Water heaters.

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§ 429.17 Water heaters.
Link to an amendment published at 81 FR 96235, Dec. 29, 2016.

(a)Determination of represented value.

(1) As of July 13, 2015, manufacturers must determine the represented value for each new basic model of water heater by applying an alternative efficiency determination method (AEDM) in accordance with 10 CFR 429.70 or by testing for the uniform energy factor, in conjunction with the applicable sampling provisions as follows:

(i) If the represented value is determined through testing, the general requirements of 10 CFR 429.11 are applicable; and

(ii) For each basic model selected for testing, a sample of sufficient size shall be randomly selected and tested to ensure that -

(A) Any represented value of the energy consumption or other measure of energy use of a basic model for which consumers would favor lower values shall be greater than or equal to the higher of:

(1) The mean of the sample, where:

and, x is the sample mean; n is the number of samples; and xi is the ith sample;
Or,

(2) The upper 95-percent confidence limit (UCL) of the true mean divided by 1.10, where

And x is the sample mean; s is the sample standard deviation; n is the number of samples; and t0.95 is the t statistic for a 95-percent one-tailed confidence interval with n-1 degrees of freedom (from Appendix A).

(B) Any represented value of energy efficiency or other measure of energy consumption of a basic model for which consumers would favor higher values shall be less than or equal to the lower of:

(1) The mean of the sample, where:

and, x is the sample mean; n is the number of samples; and xi is the ith sample;
Or,

(2) The lower 95-percent confidence limit (LCL) of the true mean divided by 0.90, where:

And x is the sample mean; s is the sample standard deviation; n is the number of samples; and t0.95 is the t statistic for a 95-percent one-tailed confidence interval with n-1 degrees of freedom (from Appendix A).

(C) Any represented value of the rated storage volume must be equal to the mean of the measured storage volumes of all the units within the sample.

(D) Any represented value of first-hour rating or maximum gallons per minute (GPM) must be equal to the mean of the measured first-hour ratings or measured maximum GPM ratings, respectively, of all the units within the sample.

(2) For basic models initially certified before July 13, 2015 (using either the energy factor test procedure contained in appendix E to subpart B of 10 CFR part 430 of the January 1, 2015 edition of the Code of Federal Regulations or the thermal efficiency and standby loss test procedures contained in 10 CFR 431.106 of the January 1, 2015 edition of the Code of Federal Regulations, in conjunction with applicable sampling provisions), manufacturers must:

(i) Determine the represented value for each basic model by applying an AEDM in accordance with 10 CFR 429.70 or by testing for the uniform energy factor, in conjunction with the applicable sampling provisions of paragraph (a)(1) of this section; or

(ii) Calculate the uniform energy factor for each test sample by applying the following mathematical conversion factors to test data previously obtained through testing according to appendix E to subpart B of 10 CFR part 430 of the January 1, 2015 edition of the Code of Federal Regulations or the thermal efficiency and standby loss test procedures contained in 10 CFR 431.106 of the January 1, 2015, edition of the Code of Federal Regulations. Represented values of uniform energy factor, first-hour rating, and maximum GPM rating based on a calculation using this mathematical conversion factor must be determined using the applicable sampling provisions in paragraphs (a)(1)(i) and (ii) of this section.

(A) Calculate the New First Hour Rating (New FHR) or New Max Gallons per Minute (New Max GPM), as applicable, using the equations presented in the table in this paragraph.

Product class Distinguishing criteria Conversion factor *
Consumer Gas-fired Water Heater Non-Condensing, Standard and Low NOX New FHR = 7.9592 0.8752 × FHRP.
Non-Condensing, Ultra-Low NOX New FHR = 25.0680 0.6535 × FHRP.
Condensing New FHR = 1.0570 × FHRP.
Consumer Oil-fired Water Heater N/A New FHR = 0.9102 × FHRP.
Consumer Electric Water Heater Electric Resistance New FHR = 9.2827 0.8092 × FHRP.
Heat Pump New FHR = −4.2705 0.9947 × FHRP.
Tabletop Water Heater N/A New FHR = 41.5127 0.1989 × FHRP.
Instantaneous Gas-fired Water Heater N/A New Max GPM = 1.1461 × Max GPMP.
Instantaneous Electric Water Heater N/A New Max GPM = 1.1461 × Max GPMP.
Grid-Enabled Water Heater N/A New FHR = 9.2827 0.8092 × FHRP.
Residential-Duty Commercial Gas-fired Water Heater N/A New FHR = −35.8233 0.4649 × Vm 160.5089 × Et.
Residential-Duty Commercial Oil-fired Water Heater N/A New FHR = −35.8233 0.4649 × Vm 160.5089 × Et.
Residential-Duty Commercial Electric Instantaneous Water Heater N/A New Max GPM = 0.0146 0.0295 × Q.

FHRP = prior first-hour rating.

Max GPMP = prior maximum GPM rating.

Q = nameplate input rate, in kBtu/h.

Et = thermal efficiency rating.

Vm = measured storage volume in gallons.

(B) Determine the applicable draw pattern as follows:

(1) For consumer gas-fired water heaters, consumer oil-fired water heaters, consumer electric water heaters, tabletop water heaters, grid-enabled water heaters, residential-duty commercial gas water heaters, residential-duty commercial oil-fired water heaters: Use the New FHR (as defined in paragraph (a)(2)(ii)(A) of this section) to select the applicable draw pattern from the table in this paragraph:

New FHR greater than or equal to: and new FHR less than: Draw pattern
0 gallons 18 gallons Very Small.
18 gallons 51 gallons Low.
51 gallons 75 gallons Medium.
75 gallons No upper limit High.

(2) For instantaneous gas-fired water heaters, instantaneous electric water heaters, and residential-duty commercial electric instantaneous water heaters: Use New Max GPM (as defined in paragraph (a)(2)(ii)(A) of this section) to select the applicable draw pattern from the table in this paragraph:

New max GPM greater than or equal to: And new max GPM rating less than: Draw pattern
0 gallons/minute 1.7 gallons/minute Very Small.
1.7 gallons/minute 2.8 gallons/minute Low.
2.8 gallons/minute 4 gallons/minute Medium.
4 gallons/minute No upper limit High.

(C) For consumer electric heat pump water heaters, use the draw pattern to determine the applicable drawn volume (DV) from the table in this paragraph:

Draw pattern DV
Very Small 10 gallons.
Low 38 gallons.
Medium 55 gallons.
High 84 gallons.

(D) For each class besides consumer electric heat pump water heaters, use the applicable equation to calculate: UEFWHAM (for consumer storage water heaters-except heat pumps), UEFmodel (for consumer instantaneous water heaters), UEFrd (for residential-duty commercial storage water heaters), and UEFrd, model (for residential-duty commercial electric instantaneous water heaters) as follows:

(1) For consumer storage water heaters (except consumer electric heat pump water heaters):

Where a, b, c, and d are coefficients based on the applicable draw pattern as specified in the table below; EF is the energy factor; ηr is the recovery efficiency in decimal form; and P is the input rate in Btu/h.

Draw pattern a b c d
Very Small 0.250266 57.5 0.039864 67.5
Low 0.065860 57.5 0.039864 67.5
Medium 0.045503 57.5 0.039864 67.5
High 0.029794 57.5 0.039864 67.5

(2) For consumer instantaneous water heaters:

Where ηr is the recovery efficiency expressed in decimal form and A is dependent upon the applicable draw pattern and fuel type as specified in the table in this paragraph.

Draw pattern A
Electric Gas
Very Small 0.003819 0.026915
Low 0.001549 0.010917
Medium 0.001186 0.008362
High 0.000785 0.005534

(3) For residential-duty commercial storage water heaters:

Where P is the input rate in Btu/h; Et is the thermal efficiency; SL is the standby loss in Btu/h; and F and G are coefficients as specified in the table in this paragraph based on the applicable draw pattern.

Draw pattern F G
Very Small 0.821429 0.0043520
Low 0.821429 0.0011450
Medium 0.821429 0.0007914
High 0.821429 0.0005181

(4) For residential-duty commercial electric instantaneous water heaters:

Where Et is the thermal efficiency expressed in decimal form and A is dependent upon the applicable draw pattern, as specified in the table in this paragraph.

Draw pattern A
Very Small 0.003819
Low 0.001549
Medium 0.001186
High 0.000785

(E) Calculate the “New UEF” (i.e., the converted UEF) using the applicable equation in the table in this paragraph.

Product class Distinguishing criteria Conversion factor
Consumer Gas-fired Water Heater Non-Condensing, Standard and Low NOX New UEF = −0.0002 0.9858 × UEFWHAM.
Non-Condensing, Ultra-Low NOX New UEF = 0.0746 0.8653 × UEFWHAM.
Condensing New UEF = 0.4242 0.4641 × UEFWHAM.
Consumer Oil-fired Water Heater N/A New UEF = −0.0033 0.9528 × UEFWHAM.
Consumer Electric Water Heater Electric Resistance New UEF = 0.4774 0.4740 × UEFWHAM.
Heat Pump New UEF = 0.1513 0.8407 × EF 0.0043 × DV.
Tabletop Water Heater N/A New UEF = −0.3305 1.3983 × UEFWHAM.
Instantaneous Gas-fired Water Heater N/A New UEF = 0.1006 0.8622 × UEFmodel.
Instantaneous Electric Water Heater N/A New UEF = 0.9847 × UEFmodel.
Grid-Enabled Water Heater N/A New UEF = 0.4774 0.4740 × UEFWHAM.
Residential-Duty Commercial Gas-fired Water Heater N/A New UEF = −0.0022 1.0002 × UEFrd.
Residential-Duty Commercial Oil-fired Water Heater N/A New UEF = −0.0022 1.0002 × UEFrd.
Residential-Duty Commercial Electric Instantaneous Water Heater N/A New UEF = UEFrd, model.

New UEF = converted UEF.

EF = Energy Factor.

(b)Certification reports.

(1) The requirements of 10 CFR 429.12 apply; and

(2) Pursuant to 10 CFR 429.12(b)(13), a certification report must include the following public, product-specific information:

(i) For storage-type water heater basic models previously certified for energy factor pursuant to § 429.17(a) of the January 1, 2015 edition of the Code of Federal Regulations, and for which uniform energy factor is calculated pursuant to 10 CFR 429.17(a)(2)(ii): The energy factor (EF, rounded to the nearest 0.01), the uniform energy factor (UEF, rounded to the nearest 0.01), the rated storage volume in gallons (gal, rounded to the nearest 1 gal), the uniform energy factor test procedure first-hour rating in gallons (gal, rounded to the nearest 1 gal) as determined under paragraph (a)(2)(ii)(A) of this section, the previously certified first-hour rating under the energy factor test procedure in gallons (gal, rounded to the nearest 1 gal), and the recovery efficiency in percent (%, rounded to the nearest 1%);

(ii) For storage-type water heater basic models rated pursuant to 10 CFR 429.17(a)(1) or 10 CFR 429.17(a)(2)(i): The uniform energy factor (UEF, rounded to the nearest 0.01), the rated storage volume in gallons (gal, rounded to the nearest 1 gal), the first-hour rating in gallons (gal, rounded to the nearest 1 gal), and the recovery efficiency in percent (%, rounded to the nearest 1%);

(iii) For instantaneous-type water heater basic models previously certified for energy factor pursuant to § 429.17(a) of the January 1, 2015 edition of the Code of Federal Regulations, and for which uniform energy factor is calculated pursuant to 10 CFR 429.17(a)(2)(ii): The energy factor (EF, rounded to the nearest 0.01), the uniform energy factor (UEF. rounded to the nearest 0.01), the rated storage volume in gallons (gal, rounded to the nearest 1 gal), the uniform energy factor test procedure maximum gallons per minute (gpm, rounded to the nearest 0.1 gpm) as determined under paragraph (a)(2)(ii)(A) of this section, the previously certified maximum gallons per minute (gpm, rounded to the nearest 0.1 gpm) under the energy factor test procedure, and the recovery efficiency in percent (%, rounded to the nearest 1%);

(iv) For instantaneous-type water heater basic models rated pursuant to 10 CFR 429.17(a)(1) or 10 CFR 429.17(a)(2)(i): The uniform energy factor (UEF, rounded to the nearest 0.01), the rated storage volume in gallons (gal, rounded to the nearest 1 gal), the maximum gallons per minute (gpm, rounded to the nearest 0.1 gpm), and the recovery efficiency in percent (%, rounded to the nearest 1%);

(v) For grid-enabled water heater basic models previously certified for energy factor pursuant to 10 CFR 429.17(a) of the January 1, 2015 edition of the Code of Federal Regulations, and for which uniform energy factor is calculated pursuant to 10 CFR 429.17(a)(2)(ii): The energy factor (EF, rounded to the nearest 0.01), the uniform energy factor (UEF, rounded to the nearest 0.01), the rated storage volume in gallons (gal, rounded to the nearest 1 gal), the uniform energy factor test procedure first-hour rating in gallons (gal, rounded to the nearest 1 gal) as determined under paragraph (a)(2)(ii)(A) of this section, the previously certified first-hour rating under the energy factor test procedure in gallons (gal, rounded to the nearest 1 gal), the recovery efficiency in percent (%, rounded to the nearest 1%), a declaration that the model is a grid-enabled water heater, whether it is equipped at the point of manufacture with an activation lock, and whether it bears a permanent label applied by the manufacturer that advises purchasers and end-users of the intended and appropriate use of the product; and

(vi) For grid-enabled water heater basic models rated pursuant to 10 CFR 429.17(a)(1) or 10 CFR 429.17(a)(2)(i): The uniform energy factor (UEF, rounded to the nearest 0.01), the rated storage volume in gallons (gal, rounded to the nearest 1 gal), the first-hour rating in gallons (gal, rounded to the nearest 1 gal), and the recovery efficiency in percent (%, rounded to the nearest 1%), a declaration that the model is a grid-enabled water heater, whether it is equipped at the point of manufacture with an activation lock, and whether it bears a permanent label applied by the manufacturer that advises purchasers and end-users of the intended and appropriate use of the product.

[81 FR 96232, Dec. 29, 2016]

Title 10 published on 2015-12-04

The following are ALL rules, proposed rules, and notices (chronologically) published in the Federal Register relating to 10 CFR Part 429 after this date.

  • 2017-01-05; vol. 82 # 3 - Thursday, January 5, 2017
    1. 82 FR 1426 - Energy Conservation Program: Test Procedures for Central Air Conditioners and Heat Pumps
      GPO FDSys XML | Text
      DEPARTMENT OF ENERGY, Office of Energy Efficiency and Renewable Energy
      Final rule.
      The effective date of this rule is February 6, 2017. The final rule changes of appendix M will be mandatory for representations of efficiency starting July 5, 2017. Representations using appendix M1 will be mandatory starting January 1, 2023. The incorporation by reference of certain publications listed in Appendix M1 is approved by the Director of the Federal Register on February 6, 2017 February 6, 2017. The incorporation by reference of certain publications listed in Appendix M was approved by the Director of the Federal Register as of July 8, 2016.
      10 CFR Parts 429 and 430

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Title 10 published on 2015-12-04.

The following are only the Rules published in the Federal Register after the published date of Title 10.

For a complete list of all Rules, Proposed Rules, and Notices view the Rulemaking tab.

  • 2017-01-05; vol. 82 # 3 - Thursday, January 5, 2017
    1. 82 FR 1426 - Energy Conservation Program: Test Procedures for Central Air Conditioners and Heat Pumps
      GPO FDSys: XML | Text
      DEPARTMENT OF ENERGY, Office of Energy Efficiency and Renewable Energy
      Final rule.
      The effective date of this rule is February 6, 2017. The final rule changes of appendix M will be mandatory for representations of efficiency starting July 5, 2017. Representations using appendix M1 will be mandatory starting January 1, 2023. The incorporation by reference of certain publications listed in Appendix M1 is approved by the Director of the Federal Register on February 6, 2017 February 6, 2017. The incorporation by reference of certain publications listed in Appendix M was approved by the Director of the Federal Register as of July 8, 2016.
      10 CFR Parts 429 and 430