Hard to tell for sure without a close look, but the roofing / waterproofing material looks like TPO, a single-ply roofing membrance. It is not made for direct traffic, so appears someone has installe ... read more
Typically $750 - $1,000 is an acceptable range, based on specs for the heater, location of the unit and fuel source, with gas being more expensive in most localities. Some models with higher performan ... read more