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(d) Water heaters. The energy factor of water heaters shall not be less than the following for products manufactured on or after the indicated dates. ----------------------------------------------------------------------------------------------------------------
Energy factor as of Energy factor as of April
Product class Storage volume January 20, 2004 16, 2015----------------------------------------------------------------------------------------------------------------Gas-fired Storage Water Heater..... =20 gallons 0.67-(0.0019 x Rated For tanks with a Rated
and <=100 gallons. Storage Volume in Storage Volume at or below
gallons). 55 gallons: EF = 0.675-
(0.0015 x Rated Storage
Volume in gallons). For
tanks with a Rated Storage
Volume above 55 gallons:
EF = 0.8012-(0.00078 x
Rated Storage Volume in
gallons).Oil-fired Storage Water Heater..... <=50 gallons.......... 0.59-(0.0019 x Rated EF = 0.68-(0.0019 x Rated
Storage Volume in Storage Volume in
gallons). gallons).Electric Storage Water Heater...... =20 gallons 0.97-(0.00132 x Rated For tanks with a Rated
and <=120 gallons. Storage Volume in Storage Volume at or below
gallons). 55 gallons: EF = 0.960-
(0.0003 x Rated Storage
Volume in gallons). For
tanks with a Rated Storage
Volume above 55 gallons:
EF = 2.057-(0.00113 x
Rated Storage Volume in
gallons).Tabletop Water Heater.............. =20 gallons 0.93-(0.00132 x Rated EF = 0.93-(0.00132 x Rated
and <=120 gallons. Storage Volume in Storage Volume in
gallons). gallons).Instantaneous Gas-fired Water <2 gallons............ 0.62-(0.0019 x Rated EF = 0.82-(0.0019 x Rated
Heater. Storage Volume in Storage Volume in
gallons). gallons).Instantaneous Electric Water Heater <2 gallons............ 0.93-(0.00132 x Rated EF = 0.93-(0.00132 x Rated
Storage Volume in Storage Volume in
gallons). gallons).----------------------------------------------------------------------------------------------------------------Note: The Rated Storage Volume equals the water storage capacity of a water heater, in gallons, as certified by
the manufacturer.
Exclusions: The energy conservation standards shown in this paragraph do not apply to the following types of water heaters: gas-fired, oil-fired, and electric water heaters at or above 2 gallons storage volume and below 20 gallons storage volume; gas-fired water heaters above 100 gallons storage volume; oil-fired water heaters above 50 gallons storage volume; electric water heaters above 120 gallons storage volume; gas-fired instantaneous water heaters at or below 50,000 Btu/h.
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