Which is more efficient a P38+ or a P61 ? Which is more efficient a big stove or a little stove ? I'd like to buy a P38+ ; many people have told me it is to small with our 2200 sq ft house. But we are a tight house with stress skip panels. Our 75K btu oil heater supplies domestic hot water and heat. And the P38 is actually 43,000 btus. So I'm thinking it is a wash. But if the P61 is more efficient I might as well go in that direction. Does anyone know or have experience with this ? Thank you kindly. Larry'