Quote:
Originally Posted by ksa8907
The most efficient temperature differential would be where you get the most amount of heat rise in the air leaving the furnace with the same blower speed. Think bsfc. The most temperature rise with the two variables being heat exchanger temp and fuel consumption.
It may turn out that a higher temp in the exchanger is better and uses only a small amount more fuel to get there.
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Yes and no. The hotter the fire box and the cooler the exhaust is after it leaves the heat exchanger the more efficient the system is. The problem is the thermo switch in question has no effect that I know of on the fire box temperature. It's purpose is to cool the exhaust and heat the house. Which is the whole idea of getting it to turn on and not just let the flame burn for several minutes sending heat right out the chimney.