print logo
Main Content Anchor

Water Heaters

​On March 25, 2010, the Sac Metro Air District Board of Directors approved amendments to Rule 414 - Water Heaters, Boilers, and Process Heaters Rated Less Than 1,000,000 BTU Per Hour. These amendments establish lower NOx emission limits for water heaters sold and/or installed in Sacramento County. As of January 1, 2011, a person shall only distribute, offer for sale, sell, or install a water heater, boiler, or process heater with certified NOx and CO emissions less than or equal to Rule 414 limits.

Heat Input Range and TypeNOx Limit Nanograms per Joule of Heat Output (ppm @ 3% O2)​​CO Limit ppmv @ 3% O2 ​

​< 75,000 Btu/hr

Mobile Home

All Others


40 (55)

 10 (15)


No Limit

No Limit​

75,000 to < 400,000 Btu/hr


All Others


​40 (55)

14 (20)


No Limit

No Limit

400,000 to < 1million Btu/hr

All Types


​​14 (20)



 Anyone who sells offers for sale, supplies, or installs equipment not meeting the requirements of Rule 414 is subject to a Notice of Violation and penalties as specified in California Health and Safety Code Section 42402.

If you have any questions concerning these requirements, email or call 279-207-1122 ext. 14.

Supporting Page
Back to Top