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The A. O. Smith Tankless Condensing Ultra-Low NOx 540P series integrates a recirculation pump to provide instant hot water in residential applications with dedicated recirculation lines. The pump is easily controlled with a simple user interface and multiple pump settings allow you to customize pump operation to meet needs while maximizing heater efficiency. The onboard computer modulates combustion to yield an up to 0.95 Uniform Energy Factor (UEF) while meeting the strictest gas emissions standards. As part of the high efficiency tankless family, the 540P series uses up to 199,000 BTU/hr to deliver endless hot water while being environmentally friendly.