[HereInTheHeartland]

Thats good first hand information, thanks.
Its contrary to what I have previously know about the technology; so its good to hear of your experience.

[palmer]

He heats with wood. Unless you have natural gas or wood heat in Iowa you are not going to save very much copying his small system. That's because your heat exchanger will continue to require grid electricity in winter. You may build up some grid credits in summer, but realize that's a subsidy from your neighbors.