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Re: Propane furnace in COLD weather
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Propane begins to boil at minus 43.7 degrees F, at that temperature the pressure in your tank will measure zero psi. At minus 20 degrees F the tank pressure will be approximately 10.3 psi and at minus 30 degrees F 5.3 psi. Conversely at 100 degrees F the tank pressure will measure approximately 175.3 psi. The tank pressure is proportional to temperature - the gas company cannot pressurize your tank.
Typically propane furnaces will specify a gas pressure requirement at the furnace manifold. My furnace requires 10" H20 (inches of water). Since 10"H20 is equal to approximately 0.361 psi there should be sufficient pressure in your tank even at minus 30 degrees. There are likely three pressure regulators in your system, a high pressure at the tank, low pressure at the house and finally the manifold pressure on the furnace.
I would suggest the regulators be checked and adjusted as required and also have the furnace checked/cleaned as others have posted.
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