Has anyone performed a tankless attic install in the Tri-state area? I currently have a commercial Rheem indoor tankless unit. One of the call center folks, after consulting with a tech for like five minutes, told me the freeze protection mechanism should make the attic install a viable option. Despite what the call center says, I'm under the impression that the freeze protection mechanism is a measure of last resort. I'm not sure it's made to operate on a continuous basis from late December through early March. My goal is to have no water heater in my basement. I'm not interested in saving the planet by consuming less energy or something. My CFLs are supposed to do that. What is a good solution to protect the Rheem unit from freezing temperatures?