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.
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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