> -----Original Message-----
> From: piclist-bounces@mit.edu 
> [mailto:piclist-bounces@mit.edu] On Behalf Of hgraf
> Sent: Thursday, September 21, 2006 8:14 AM
> To: Microcontroller discussion list - Public.
> Subject: Re: [OT] Building a house - help me brainstorm!
> 
> On Thu, 2006-09-21 at 09:49 -0300, Gerhard Fiedler wrote:
...

> The neat part is he has duel fuel. He has a
> wood furnace and a natural gas furnace. Whichever furnace is active
> heats water that circulates through a heat exchanger in the duct work,
> heating the house. 

Just a comment on a similar system, I needed a new furnace a few years
ago, and coincidently needed a new gas water heater at the same time.
So we installed a system that uses the water heater as the thermal
source, with a heat exchanger in the air handler.  Had it about five
years now and no complaints.  It cut the heating costs in half, but it's
hard to judge efficiency, since the furnace it replaced was crap.  We
bump up the water heater temp in the coldest part of the winter to get
enough heat out of it (dial-a-btu), but the domestic water is kept
constant by a tempering valve.

Gary

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