furnace [RE-wrenches]

[Tom Simko]

on 4/21/02 11:14 PM, info at backwoodssolar.com at info at backwoodssolar.com
wrote:

> I have recommended a simple tank type gas water heater for in-floor heating.
> You avoid complex control systems, you avoid pumping water from and to a
> tank during the heating of the water.  You use a small pump and line voltage
> thermostat or thermostat and relay for each zone, not a large pump and zone
> valves.  This works if installed right, and I am not an expert in this
> installations or design.  I do know that many problems are avoided and these
> simple systems have worked well.
> Steve Willey
> Backwoods Solar Electric Systems
> ----- Original Message -----
> From: <sunwise at cheqnet.net>
> To: <RE-wrenches at topica.com>
> Sent: Sunday, April 21, 2002 10:13 PM
> Subject: Re: furnace [RE-wrenches]
> 
> 
>> Travis Creswell wrote:
>>> 
>>>> Watch out about trying to run new furnaces with inverters (even SW's).
>> 
>> Thanks to everyone who responded to my furnace inquire, espeically Windy
>> who posted the gas valve P-load work-around and all.  I think I may have
>> the client talked into an LP gas fired boiler and hydronic heating
>> system (in-floor in the basement ceiling suppling the uptairs and
>> baseboard in the basement itself).
>> 
>> If I could continue the thread, can anyone offer information on what LP
>> gas boiler's or hydronic heating systems that have worked well in
>> off-grid heating?
>> 
> 
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> 
 If going the gas heater route as the heat source for the radiant floor loop
you may want to consider using a dual purpose heater with a built in double
wall heat exchanger (Lochinvar and A.O. Smith both make them). This heat
exchanger is not to be confused with a solar thermal tank type heat
exchanger, which is designed to transfer heat INTO the tank, this is
configured and posistioned differently to EXTRACT heat from the tank.
Available in propane or natural gas, will provide DWH from the main tank
storage, while the radiant floor loop is linked to the heat exchanger loop,
its as simple as it gets and code legal. These units also have a high BTU
output burner, 65,000 and up, to provide rapid recovery. With a mixing valve
you can make and store 160 degree water, while running 120 through the DHW
loop, and 100 through the raidiant loop, this gives a larger thermal reserve
in times of heavy load.

Tom 

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