ProLine 540 Series Residential/Commercial Indoor Condensing Ultra-Low Nox Tankless Indoor Water Heater with X3 Technology, NG - 15 - 199 MBTU - 23-5/8" H x 17-3/4" W x 11-1/4" D

The Proline XE Condensing Ultra-Low NOx series with X3 Scale Prevention Technology is well suited for residential applications. A. O. Smith has combined water heating and treatment in a product designed to revolutionize tankless water heating. Our new condensing gas tankless line features X3 Scale Prevention Technology to last three times longer than other tankless models without X3 Technology. Complies with Ultra-Low NOx regulations. These tankless heaters utilize commercial grade copper alloy for the heat exchanger tubing and are approved to work with an external recirculation pump and cross-over valve. Certified up to 10,100 ft. altitude.

The ATI-540HX3-N tankless water heater uses up to 199,000 BTU/hr of natural gas to deliver an endless supply of hot water for a 3 bath home in northern climates and up to a 4 bath home in southern climates (one shower head per bath). Our new condensing gas tankless line features X3 Scale Prevention Technology to last three times longer than other tankless models without X3 Technology. This heater is extremely efficient with a Uniform Energy Factor of 0.93, and complies with Ultra-Low NOx regulations.. With an industry leading 15-year limited warranty, the ATI-540HX3-N tankless water heater provides years of hot water through innovation and quality.

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Condensing gas tankless water heaters with X3® Scale Prevention Technology are attached directly to the water line. When you open a hot water tap, the burner in your gas tankless water heater activates. As water flows through the unit, it quickly reaches the preset temperature by rapidly absorbing heat from both heat exchangers. Our patent pending X3 Scale Prevention Technology allows mineral particles to pass through harmlessly while also continually protecting the heat exchanger from scale buildup. This eliminates the need for regular descaling and extends the units life up to three times vs. a tankless model without X3 Scale Prevention Technology.

Due to this direct heat exchange, these condensing gas tankless water heaters provide long-lasting, on-demand hot water. When the water tap is turned off, the unit shuts down to conserve energy.