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Posted by Joe Brix on February 08, 2006 at 15:09:36:
In Reply to: Re: Boiler question posted by Stephen on February 08, 2006 at 05:29:28:
: Thanks for the reply. Last weekend, when the weather was warm, the thermostat read between 69-71, even though we had the programmable thermostat set at 66. The radiators around the house were all warm.
: It seems more to the novice in me that the furnace is not insulated well, allowing the water temp to drop some 50 degrees regularly.
: Is that a reasonable observation or is there something else I am not understanding?
: Stephen
You're probably experienceing ghost flow. You have a circulator(s) but no flow checks. The warm water in the boiler continues to rise up into your heating zone pipes even though the circulator is not running. Does your boiler also make your domestic hot water? Since the boiler needs to stay hot, you should look into getting flow checks installed to prevent gravity flow.
Newer boilers are well insulated, but that flue pipe will always be sucking some heat out of the boiler.