Furnace propane ussage
We have a 2012 Cougar 327RES fifth and last night I had to stay in it to prevent the water lines from frizing since it got down to 24F. I used what I thought was a full propane bottle and this mornin...
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A typical furnace is in the 30-40KBTU/Hr range. Propane IIRC has about 80KBTU/gallon. so figure between 1/3 and 1/2 gallon of propane per hour of furnace running. Same goes for the WH.
and, here is a tip. when using the furnace in near freezing weather, more than likely the propane switchover will switch tanks before the tank is empty.
What happens is that as the tank is near empty in cold weather the tank pressure drops low enough to signal an "empty tank" with around 1 gallon of propane left. Propane boils at -40F and the vapor pressure drops to low with high draw to keep the required flow.
I have a light than flashes indicating tank switchover in my trailer. The first time it switches, I wait till late morning early afternoon after the furnace is done running and switch the tank back to the "empty" tank. It will usually run on the "empty" tank till late evening before switching again. By then the tank is really empty.
and, here is a tip. when using the furnace in near freezing weather, more than likely the propane switchover will switch tanks before the tank is empty.
What happens is that as the tank is near empty in cold weather the tank pressure drops low enough to signal an "empty tank" with around 1 gallon of propane left. Propane boils at -40F and the vapor pressure drops to low with high draw to keep the required flow.
I have a light than flashes indicating tank switchover in my trailer. The first time it switches, I wait till late morning early afternoon after the furnace is done running and switch the tank back to the "empty" tank. It will usually run on the "empty" tank till late evening before switching again. By then the tank is really empty.
