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Conservationist® high efficiency gas boilers are designed for indoor use in installations requiring higher inputs (up to 670,000 Btu). They are rust-proof because water comes in contact with nothing but copper, brass or bronze. These Conservationist models feature a patented burner design that maximizes combustion efficiency.

A. O. Smith offers the largest commercial product selection available, including the most specified commercial unit in the U.S. We offer more than 500 different commercial models, including gas fired, oil-fired and electric configurations, ranging in capacities from 5 to 10,000 gallons, with input range from 50,000 BTU to the equivalent of 4,000,000 BTU. Our comprehensive line is the natural fit for spec jobs requiring everything from the smallest commercial installation up to the largest multi-structure complex.