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Posted by HeatPro on June 15, 2008 at 08:17:17:
In Reply to: New gas steam boiler posted by Bob Gare on June 14, 2008 at 21:06:06:
There are no condensing steam boilers, as the temperature has to be high enough to make steam on every cycle. The DOE test for boilers is done at an average temperature of 140F, thus steam boilers can never be tested compared to water boilers; the DOE AFUE test is done as if the steam boiler was to be used at 140F, like a hot water boiler; so steam boilers are far less efficient than rated.
If you are really serious about efficiency, it is time to fully insulate the home and change to a water baseboard system where each room can be individually zoned and stop fooling with antique steam technology for heating a home. You'll like paying 1/3rd the fuel cost. Houses that need a 120,000 btuh output now are 5000 square feet. The country is in serious need of conserving fuel.
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