Thermal efficiency regulation of solar water heaters (NOM-027-ENER/SCFI-2018)

Last updated: 3 December 2019

The regulation establishes the thermal efficiency, gas savings and safety requirements of solar water heaters and solar water heaters backed by LPG (liquefied petroleum gas) or natural gas that are intended to be introduced into the Mexican market. Technical specifications, testing methods, and labeling are also considered by the regulation.

Technical conditions for solar water heaters:

Useful heat per day - 8 hours (Mega Joules) : >12.5

Useful heat per day - 24 hours (Mega Joules) : >8.7

Useful heat per year - 8 hours (Mega Joules) : >4550

Useful heat per year - 24 hours (Mega Joules) : >3170

LPG (Liquefied Petroleum Gas) savings per month in kg:

>16.5 for 17 Mega Joules/m2 of radiation

>17 for 19 Mega Joules/m2 of radiation

>17.5 for 21 Mega Joules/m2 of radiation

>18 for 23 Mega Joules/m2 of radiation

>18.5 for 25 Mega Joules/m2 of radiation

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End uses covered
  • Building end-uses
  • Building systems
  • Water heating