UL (Underwriters Laboratories)
Establishes the minimum requirements for electric water heater safety.
ANSI (American National Standards Institute)
Establishes the safety and construction standards for gas products.
DOE (Department of Energy)
EPCA was enacted in 1975, which then led to the first NAECA (National Appliance Energy Conservation Act) in 1987. The Energy Policy Act of 1992 (EPACT92) covers commercial products.
ASHRAE (American Society of Heating Refrigeration and Air Conditioning Engineers)
Sets the minimum requirements for overall efficiency of buildings with the exception of low-rise buildings.