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Re: Preheat boiler return water from stack exhaust?


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Posted by HeatPro on November 20, 2007 at 11:49:35:

In Reply to: Re: Preheat boiler return water from stack exhaust? posted by Sean on November 20, 2007 at 11:06:38:

So you'd have to use logic to use the clues in the above statement. You'd need a fan to take the exhaust, as there would be less heat for a chimney. If the boiler has a fan assist exhaust, then that's there. However, you'd have to provide for condensation of the exhaust gases inside the cast iron exchanger, or rust it away, as well as compensate for water in the exhaust to rust the stack, or use stainless steel or plastic that won't rust away from the acid water. You'd also have to have drains to take the water away, which condensing boilers include. You would convert the non-condensing boiler to a condensing boiler.




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