NOM-003-ENER-2000: Thermal efficiency of water heaters for domestic and commercial use. Limits, testing method and labeling

This standard applies to water heaters for domestic and commercial use using L.P. gas or natural gas that produces only hot water. Likewise, it applies only to the following types of heaters: (1) storage; (2) rapid recovery; and (3) instantaneous ; and heaters with maximum thermal loads of 35 kW for domestic heaters and thermal loads of 35 to 108 kW in commercial heaters.
The standard establishes the thermal efficiency that the heaters must achieve based on the lower calorific power as well as the temperature of the hot water. See the attachment for the minimum thermal efficiency levels.
The standard NOM-003-ENER-2000 superseded the standard NOM-003-ENER-1995. The 2000 version includes the same energy performance requirements for the minimum energy efficiency but sets the temperature of the hot water for high temperature storage.

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