10 CFR 431.110 - Energy conservation standards and their effective dates.

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§ 431.110 Energy conservation standards and their effective dates.
Each commercial storage water heater, instantaneous water heater, unfired hot water storage tank and hot water supply boiler 1 must meet the applicable energy conservation standard level(s) as follows:

Footnote(s):
1 Any packaged boiler that provides service water, that meets the definition of “commercial packaged boiler” in subpart E of this part, but does not meet the definition of “ hot water supply boiler” in subpart G, must meet the requirements that apply to it under subpart E.

Product Size Energy conservation standard a (products manufactured on and after October 29, 2003) b
Minimum thermalefficiency Maximum standby loss c
Electric storage water heaters All N/A 0.30 27/Vm (%/hr)
Gas-fired storage water heaters ≤155,000 Btu/hr>155,000 Btu/hr 80%80% Q/800 110(Vr) 1/2 (Btu/hr)Q/800 110(Vr) 1/2 (Btu/hr)
Oil-fired storage water heaters ≤155,000 Btu/hr>155,000 Btu/hr 78%78% Q/800 110(Vr) 1/2 (Btu/hr)Q/800 110(Vr) 1/2 (Btu/hr)
Gas-fired instantaneous water heaters and hot water supply boilers <10 gal≥10 gal 80%80% N/AQ/800 110(Vr) 1/2 (Btu/hr)
Oil-fired instantaneous water heaters and hot water supply boilers <10 gal≥10 gal 80%78% N/AQ/800 110(Vr) 1/2 (Btu/hr)
Product Size Minimum thermal insulation
a Vm is the measured storage volume and Vr is the rated volume, both in gallons. Q is the nameplate input rate in Btu/hr.
b For hot water supply boilers with a capacity of less than 10 gallons: (1) the standards are mandatory for products manufactured on and after October 21, 2005, and (2) products manufactured prior to that date, and on or after October 23, 2003, must meet either the standards listed in this table or the applicable standards in subpart E of this part for a “commercial packaged boiler.”
c Water heaters and hot water supply boilers having more than 140 gallons of storage capacity need not meet the standby loss requirement if (1) the tank surface area is thermally insulated to R-12.5 or more, (2) a standing pilot light is not used and (3) for gas or oil-fired storage water heaters, they have a fire damper or fan assisted combustion.
Unfired hot water storage tank All R-12.5
[69 FR 61983, Oct. 21, 2004; 69 FR 63574, Nov. 2, 2004]

Title 10 published on 2015-01-01.

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.

  • 2015-03-06; vol. 80 # 44 - Friday, March 6, 2015
    1. 80 FR 12078 - Energy Conservation Program: Energy Conservation Standards for Walk-In Coolers and Freezers; Correction
      GPO FDSys XML | Text
      DEPARTMENT OF ENERGY, Office of Energy Efficiency and Renewable Energy
      Final rule; correction.
      This correction is effective March 6, 2015.
      10 CFR Part 431

Title 10 published on 2015-01-01

The following are ALL rules, proposed rules, and notices (chronologically) published in the Federal Register relating to 10 CFR Part 431 after this date.

  • 2015-05-20; vol. 80 # 97 - Wednesday, May 20, 2015
    1. 80 FR 28850 - Energy Conservation Program for Consumer Products and Certain Commercial and Industrial Equipment: Test Procedures for Consumer and Commercial Water Heaters
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      DEPARTMENT OF ENERGY, Office of Energy Efficiency and Renewable Energy
      Reopening of the public comment period and announcement of public meeting.
      Comments: The comment period for the NOPR for the Conversion Factor for Test Procedures for Consumer and Certain Commercial Water Heaters published on April 14, 2015 (80 FR 20116), is reopened. DOE will accept comments, data, and information regarding this NOPR before and after the public meeting, but no later than June 15, 2015. Meeting: DOE will hold a public meeting on Thursday, May 28, 2015 from 10:00 a.m. to 4:00 p.m., in Washington, DC. The meeting will also be broadcast as a webinar.
      10 CFR Parts 429, 430, and 431