Bosch 520 HN NG Indoor Natural Gas Tankless Water Heater
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The Therm 520 HN NG Indoor Tankless Natural Gas Water Heater incorporates an evolutionary hydro-powe ignition system which allows this tankless water heater to work without a standing pilot, grid connection or battery! A small turbine inside the water heater uses the energy from the flowing water to ignite the burner. The modulating gas valve then maintains a constant temperature at varying flow rates.