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RESIDENTIAL GAS AND ELECTRIC WATER HEATER
SERVICE HANDBOOK
A.O. Smith Water Products Company Technical Training Department
©2005 Ashland City, TN
36
Residential Electric – continued
CERTIFICATION AND APPROVALS
UL – UL-174 applies to Residential Electric Water Heaters
The following paragraph describes the relationship between ASHRAE, NAECA and the
Department of Energy’s ENERGY FACTOR as it relates to the residential electric product lime.
All of the A.O. Smith residential electric water heaters meet this code.
The American Society of Heating, Refrigeration and Air Conditioning Engineer (ASHRAE)
guidelines follow the National Appliance Energy Conservationist Act (NAECA). NAECA follows
the Department of Energy (DOE) test procedures of the 1990 code of federal regulation, title 10,
part 430 (64) which establishes minimum Energy Factors (EF) for water heaters of 12 kilowatts
or less and a storage capacity of at least 20, but not more than 120 gallons.
Formula (as of January 2004) -The minimum EF allowed = .97 - .00132 x V (volume of storage)
Example (EES-52; 50 gal. x .00132 = .066 Then .97 - .066 = .904 minimum allowable energy
factor).