20 degreeF, therefore don"t think your 250,000 Btu heater is to run properly even on a100# tank. In ~ 20 degree F, you must manifold at least three 100# tanksfor maximum output.Tank sizing for heaters is very hard to know if you room not familiarwith it. To do it a tiny easier to understand, just figure 75,000 Btuper 100# tank. Therefore if you have actually a 150,000 Btu heater, you must use two100# tanks manifold together. If you have actually a full 20# tank and want to runa heater, the biggest heater you have the right to run correctly at 20 degrees F is 45,000Btu"s.As you see in the graph below, in ~ 0 degree F, you only get 113,000 Btuwhen the 100# tank is full. When the tank is at 50% full you gain 64,000Btu. As soon as you have a heater that appears to be functioning great, however you can not feel lot heat, the is because the tank is short on fuel. You can sometimestell by looking at the tanks frost line.

You are watching: Btu in 20 lb propane tank

Vaporization Rate100 LB Propane Cylinders (approximate)Maximum continuous Draw In BTU every Hour At miscellaneous TemperaturesIn degrees F.
 Lbs. The Propane in Cylinder 0 level F1 Tank 20 level F1 Tank 0 degree F2 Tanks 20 degree F2 Tanks 0 level F3 Tanks 20 degree F3 Tanks 100 113,000 167,000 248,000 367,000 545,000 807,000 90 104,000 152,000 228,000 334,000 501,000 734,000 80 94,000 137,000 206,000 301,000 400,000 662,000 70 83,000 122,000 182,000 268,000 363,000 589,000 60 75,000 109,000 165,000 239,000 310,000 453,000 50 64,000 94,000 141,000 206,000 260,000 382,000 40 55,000 79,000 121,000 174,000 217,000 319,000 30 45,000 66,000 99,000 145,000 217,000 319,000 20 36,000 51,000 79,000 112,000 174,000 246,000 10 28,000 38,000 62,000 84,000 136,000 184,000
Hose Sizing
For high pressure heaters that use 1/4" hose, you can use 1/4" hoseup to 25 ft,you should use every 3/8" hose up to 75 ft, you need to use every 1/2" hosefrom 100 come 150 ft.For low pressure heaters that usage 3/8" hose, usage 3/8" approximately 50 ft,and usage 1/2" for 75 ft to 150 ft.for short pressure herbal Gas Heaters 150k and smaller, usage 1/2" hoseup to 50 ft, 3/4" hose up to 150 ft..LP Conversion8.547 cu. Ft. Every pound4.24 lbs. In gallon36.45 cu.

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Ft. Per gallon
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