That's understandable Ray. I've ribbed Mike for years about not offering a heat exchange option, but I don't think he can. I suspect he has an agreement with a few of his big market suppliers not to offer an exchange unit other than theirs.
I don't think it's a long drive to South Carolina for you, is it?
Personally, for me, I'm growing tired of slide-in units. I hate having to clean the walls all the time for smoke residue. I want a clean burning, no soot, option.
Problem is, that only comes in a direct drive, and that burns more gas.