How does cold weather affect my tankless water heater?
A Rinnai tankless water heater features built-in freeze protection. You must have both power and gas run to the unit. The water heater will not freeze when the outside air temperature is as cold as -22°F (-30°C) for indoor models or as cold as -4°F (-20°C) for outdoor models, when protected from direct wind exposure. Because of the “wind-chill” effect, any wind or circulation of air on the unit will reduce its ability to protect itself from freezing. That is why the pipes into the tankless water heater must be heat traced and insulated to protect them from freezing.
A Professional plumber will follow installation recommendations so your unit can operate optimally, even in cold weather.