Can a Rinnai external tankless water heater be used in cold climates?
Yes, the Rinnai unit provides freeze protection for the unit down to -30 degrees F, as long as you have both power and gas to the appliance. The pipes feeding the unit MUST be heat traced and insulated to provide freeze protection to them. Rinnai strongly recommends the installation of an optional drain down system on units installed outside in cold climates. This system, if installed, will allow all water inside the unit to drain out if there’s a power and/or gas outage or a component failure in the product. See the owner’s manual for optional drain down system piping.
