The AO Smith BTN Lo-NOx standard duty natural gas water heater delivers the increased BTU input and storage needed for mid-to-large volume commercial applications while complying with California SCAQMD and other regional Lo-NOx emissions standards. This category includes both non-ASME and ASME-rated versions to satisfy the pressure vessel code requirements of your jurisdiction. The BTN Lo-NOx is an ideal replacement when upgrading from older standard-efficiency gas models in regulated areas.

The Rheem GN series Lo-NOx commercial natural gas water heaters are engineered for compliance with California SCAQMD Rule 1146.2 and other strict air quality regulations governing NOx emissions from commercial water heaters. Available in both standard and ASME-rated configurations, GN series models deliver the fast recovery and reliable performance of the standard Rheem G line while meeting mandatory Lo-NOx emissions standards in regulated regions.