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NOM-027-ENER / SCFI-2018: Thermal performance, gas saving and safety requirements of solar water heaters and solar water heaters with the support of a water heater that uses L.P. gas as fuel or natural gas. Specifications, testing methods and labelling.

Last updated: 12 May 2021
This standard establishes the thermal performance specifications of solar water heaters for domestic and commercial use, thermosiphon type, that have a thermal tank with a maximum capacity of 500 liters; the gas saving of solar water heaters with the backing of a water heater that uses LP gas or natural gas as fuel. See the attachment for the minimum thermal efficiency levels.

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