magicheater, I envy you and alot of people that have your type of unit. I'm talking about the cheapest heat for the buck, but payback time in my lifetime, and a shorter time return considering my age . (versus lifetime expectancy of the unit and also me ((to face reallity)) is limited. this is what I'm really looking at and also being able to try different products. if I were still younger I would def. have hydrosil and a heat pump. at this time I'm just trying to get by without a lot of initial cost. and yes, it's hoping for the impossible. lot's of good info though.