State Water Heaters’ 540P Series Condensing Tankless with Integrated Recirculating Pump provides instant hot water while being environmentally friendly with a UEF of up to 0.95. The pump is controlled with a simple user interface and multiple pump settings, which allow for customized operation to both meet hot water needs and maximize efficiency. As part of the condensing tankless family, it uses up to 199,000 Btu/h, and can be paired with a recirculating system. The product is Energy Star qualified and built with commercial-grade materials such as marine-grade 316L stainless steel, giving it an industry-leading 15-year limited warranty, the company notes. 

State Water Heaters.