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The 118,000 BTU burner on the Paloma PTG-42PVP LP Gas "On Demand" Tankless Water Heater is designed to supply continuous hot water at 4.2 gallons per minute allowing one to two major applications such as one shower and sink to be used simultaneously. The "On Demand" feature means the it heats water only when needed, which can save up to 30 percent on fuel costs compared to a standard gas water heater or up to 70% when compared to a standard electric water heater. It also includes a built-in digital control thermostat for precise temperature control.