Would like to thank all for their input. I've been away from the computer for a couple of days, but back again. Leak is getting worse, I may shut it down and see what I can do to glue it together till I can get off the fence and get another unit here and installed.
I am located in South West Washington and have not found any dealers for units that I would consider so I do not have the chance to look them over in person. So your help and comments are most appreciated.
We have lots of experience with hot water heat, had two in the house and now the leaking one outside, in floor heat in our shop with used oil boiler, and even had diesel Webesco unit a bus conversion with in floor heat. So I plan on staying with this type of heat, but I am getting old so if I can reduce the mass of wood that would be good.
Biggest concern I have with HeatMaster is stainless steel. I got burnt once. Concerned about the low water volume with the P&M.
Bob