I have a small home. Less than 1000 s.f. I just got rid of the hot water tank with a tankless system. Now I'm thinking about tearing out the existing heater and either reinstalling it in the attic or a new one altogether. It's an upflow but not sure if it's horizontal compatible. Kenmore Power Miser 80. Just looking for anyones thought on the furnace in the attic and or if that model is horizontal ready. For me it just makes sense to get more room in the basement. Any thoughts.