So here's the unit am thinking of. http://www.starbrickstoves.com/acatalog ... TU_s_.html
It absolutely expensive but I'd work with a good used unit if i can get the price down. I could use it in conjunction to heat the hot water reduce the use of the propane for the boiler. That is the dream am thinking, feedback welcome/suggestion welcome.
The summer is coming, this should drop to half of what he is asking , this is a hot air unit, but it should give you an idea of what's available outside the dealers network
This link is broken, either the page no longer exists or there is some other issue like a typo.