I am considering going "tankless" with a Rheem RTG-66XN, which is an outdoor gas-powered tankless water heater. I live in Minnesota, and I'm interested in the outdoor unit primarily so that the unit won't consume the indoor air that I paid to heat or cool, I'd rather it consume outdoor air and so I don't need to run new venting.

  • What is the typical installation cost for an outdoor tankless unit?
  • Where would people typically install the tankless unit? Is it built to be directly exposed to the elements?
  • Rheem says their heaters are safe to -30F. Can anyone comment how it's freeze protection works?