The ATM-199M-N Adapt® SC standard condensing tankless water heater uses up to 199,000 BTUs of Natural Gas to deliver a max flow rate of 10.5 GPM. A. O. Smith’s Adapt® SC tankless water heaters deliver robust, on-demand performance and the flexibility to install in virtually any residential setting.

Optional X3® Scale Prevention Technology helps maintain like-new performance by protecting the heat exchanger from build-up. Scale prevention protection can prolong the life of the heat exchanger by up to 300% as compared to an unprotected unit.

The Adapt® SC line features a built-in Control Display for setting and checking heater status and error codes.

All models are ENERGY STAR® certified with a Uniform Energy Factor of 0.95 and comply with Ultra-Low NOx regulations. All Adapt® SC models can be installed indoors or outdoors (outdoor vent cap kit sold separately).

Cascade up to 12 like heaters for larger applications requiring multiple water heaters to work in conjunction, cable included.