Rule 1121 - Control of Nitrogen Oxides from Residential-Type, Natural Gas-Fired Water Heaters

Click below for a list of products certified by the South Coast AQMD as compliant with the requirements of Rule 1121 (PDF):

Residential-Type, Natural Gas-Fired Water Heaters (Last Updated 12/15/2023) (PDF, 493kb)

Note: The South Coast AQMD does not endorse or warrant any specific product or manufacturer.


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South Coast Air Quality Management District

21865 Copley Dr, Diamond Bar, CA 91765



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