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Posted by HeatPro on September 01, 2004 at 18:20:22:
In Reply to: Residential Combination Gas/Oil Boiler posted by Glenn on September 01, 2004 at 13:56:42:
For a somewhat poorly insulated houue of 5000 square feet, a combination boiler for heat loads over 220,000 btuh can be handled by a combination burner.
http://www.smithboiler.com/html/series19.html
A choice can be made between using a combination burner or two separate burners for gas and oil, as the switching requires burner combustion testing to assure clean combustion.