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Use of Rinnai tankless water heater in NH
thinking of changing my 13 year old water tank (propane heated) with a Rinnai tankless water heater (wood floors next to it in basement, dont want to chance a failure/flood). Are there any concerns of using this type of heater in the North East with our cold winters, etc...? (someone mentioned more popular in southern states due to weather not so cold...is this a valid concern?)...are there other down sides to this type of heater vs a typical water tank system?