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 2014-01-01

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.

  • 2014-07-11; vol. 79 # 133 - Friday, July 11, 2014
    1. 79 FR 40542 - Energy Conservation Program for Consumer Products and Certain Commercial and Industrial Equipment: Test Procedures for Residential and Commercial Water Heaters
      GPO FDSys XML | Text
      DEPARTMENT OF ENERGY, Office of Energy Efficiency and Renewable Energy
      Final rule.
      The effective date of this rule is July 13, 2015. Compliance will be mandatory starting one year after the publication in the Federal Register of a mathematical conversion factor to convert from the existing efficiency ratings to efficiency ratings under the test procedure adopted by this final rule, or December 31, 2015, whichever is later. The incorporation by reference of certain publications listed in this rule is approved by the Director of the Federal Register as of July 13, 2015. Other publications referenced were approved on March 23, 2009, and May 16, 2012.
      10 CFR Parts 429, 430, and 431

Title 10 published on 2014-01-01

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

  • 2014-09-16; vol. 79 # 179 - Tuesday, September 16, 2014
    1. 79 FR 55538 - Energy Conservation Program: Energy Conservation Standards for Packaged Terminal Air Conditioners and Packaged Terminal Heat Pumps
      GPO FDSys XML | Text
      DEPARTMENT OF ENERGY, Office of Energy Efficiency and Renewable Energy
      Notice of proposed rulemaking (NOPR) and public meeting.
      DOE will hold a public meeting on Wednesday, October 29, 2014, from 9 a.m. to 4 p.m., in Washington, DC. The meeting will also be broadcast as a webinar. See section VII, “Public Participation,” for webinar registration information, participant instructions, and information about the capabilities available to webinar participants. DOE will accept comments, data, and information regarding this notice of proposed rulemaking (NOPR) before and after the public meeting, but no later than November 17, 2014. See section VII, “Public Participation” for details.
      10 CFR Part 431