Comments on: what is the difference between a condensing boiler &amp;amp;amp;amp;amp;amp;amp;amp;amp; a gas boiler? http://www.boilershq.com/gas-boiler/what-is-the-difference-between-a-condensing-boiler-a-gas-boiler All About Boilers Sun, 18 Apr 2010 16:59:59 +0000 hourly 1 http://wordpress.org/?v=3.3.1 By: James M http://www.boilershq.com/gas-boiler/what-is-the-difference-between-a-condensing-boiler-a-gas-boiler/comment-page-1#comment-1812 James M Sun, 04 Oct 2009 09:19:59 +0000 http://www.boilershq.com/gas-boiler/what-is-the-difference-between-a-condensing-boiler-a-gas-boiler#comment-1812 Remember that Pulse furnace a few years back? That was a true condensing unit. A regular boiler operates at a HIGH exhaust temperature, thereby exhausing all condensate products up the flue. Natural gas or coal have a byproduct of combustion of water and Co2 and some Co A condensing furnace has MORE And LONGER tubes in it and it allows the gasses inside the boiler to reach a much much LOWER exhaust temp up the stack. Thus CONDENSING takes place. This is a much more efficient process as more heat is extracted from the fuel and less goes up the chimney. Problem is that the CONDENSATE forms on the inside tubes of the furnace, it is acidic and eats away at the tubes. The new furnaces are designed to take that corrosion. An old boiler or furnace is about 75 to 80 % eff. A condensing new boiler or furnace is about 92% efficient. These new ones have longer tubes and more of them and can take corrosion and they of course cost a lot more.<br><b>References : </b><br> Remember that Pulse furnace a few years back? That was a true condensing unit.

A regular boiler operates at a HIGH exhaust temperature, thereby exhausing all condensate products up the flue. Natural gas or coal have a byproduct of combustion of water and Co2 and some Co

A condensing furnace has MORE And LONGER tubes in it and it allows the gasses inside the boiler to reach a much much LOWER exhaust temp up the stack. Thus CONDENSING takes place. This is a much more efficient process as more heat is extracted from the fuel and less goes up the chimney.

Problem is that the CONDENSATE forms on the inside tubes of the furnace, it is acidic and eats away at the tubes. The new furnaces are designed to take that corrosion. An old boiler or furnace is about 75 to 80 % eff. A condensing new boiler or furnace is about 92% efficient. These new ones have longer tubes and more of them and can take corrosion and they of course cost a lot more.
References :

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