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Posted by Heatpro on December 27, 2005 at 18:32:26:
In Reply to: BOILER RUNNING posted by Joe on December 27, 2005 at 17:43:26:
Ordinarily installers design the systems expecting that the burner will run constantly when the weather gets to about -10F or so. When it is 20F outside that is 40 of the 80F that the weather will get to from 60F or about 1/2 the way to -10F, so the burner would be running about half the hour. That is a rough estimate of the time, depending on whether it is day or night, and whether people are at home cooking or not.
I designed my heat so the burner is on constantly when it is 20F outside and the house will drop to 60F inside when it is 10F outside. I use a room electric radiant heater to be comfortable where I sit in the living room then. My heat bills are lower than most due to that as the burner uses about 25,000 btuh at most when it runs constantly; but a designer can't guess that someone else would like that, so they install heaters with bigger burners to make sure the house can stay at 70F when it is zero or so out.
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