I just moved into a house with no place to put all tanks. I had to build a room in my basement that is 500sqft , it cost me over 1000 dollars to build it but it was well worth it. I heat the whole room instead of the tanks its much cheaper that way. It would cost me a arm and a leg to heat all of my tanks. I have 2 225s 2 75s 1 120 and 50