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 (7/31/20 version)(PDF, 224 kb)

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


You may also like ...

More Information



Newsletter Sign Up
Periodic newsletter updates via Email on a variety of air quality-related topics

South Coast Air Quality Management District

21865 Copley Dr, Diamond Bar, CA 91765



© 2021 South Coast Air Quality Management District