I am building our new house right now. After my 2 years of research, I decided to purchase the Garn. It is here!! but I have a question about backup system. Since I am building new construction I do not have any old heating unit to backup my Garn. Do you have any suggestion? I may crazy but can I install LP hwh tank and heat the Garn? or Is it possible to heat with LP tank less HWH? As long as my new house and Garn wont freeze I am happy with it.