NOM-003-ENER-2011: Thermal efficiency of water heaters for domestic and commercial use. Limits, testing method and labeling

Last updated: 18 July 2019
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. See the attachment for the minimum thermal efficiency levels.

The standard NOM-003-ENER-2011 supersedes the standard NOM-003-ENER-2000. The 2011 version sets the energy performance requirements for the minimum energy efficiency by type and by volume (L); and sets the same temperature of the hot water for high temperature storage as the superseded version.

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End uses covered
  • Building end-uses
  • Building systems