my friend told me he got a card from a guy at a show. that had a american energy countryside magum making hot water.So I checked to see if he could do the same to my harman .Instead of replacing my old propane boiler I purchased a boiler system from Crosslinkconversions.com and had it installed. Since I already had a pellet/corn stove it was cheaper than replacing the boiler in my old house. It was only $2000.00 for the kit and installation and hooked into my existing system. It has already saved me $1,500.00 this year because I am not using as much propane. And I burned just about the same amount of pellets as I did before. It's still hard to believe that little stove is doing so much more.