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PROPANE, BTUS, Watts

Propane tanks come in 100lb, 30lb (~7.1 gallons), 20lb ("~5 or =4.7 gallon") and 1 lb sizes. Table at $2.75/gallon

Tank (lbs) Empty Weight Cost gallons Fill Cost BTUs Btu's per hour for a month
100 lb 70 lbs $137 23.6 gals $65 2,159,400 BTUs 3000
30 lb 23.5 lbs $63 7.1 gals $19.50 649,650 BTUs 903
20 lb 17 lbs $30 4.7 gals $12.93 430,050 BTUs 597 BTUs
11 lb 13.1 lbs $57 2.6 gals $7.15 237,900 330 BTUs
1 lb 3 lbs (come filled) $3.5 0.23 gallons $3.50 21,045 29 BTUs

1 gallon of propane weighs 4.2 lbs. Or, 1 lb of propane is 1/4 of a gallon.

1 pound of propane has 21,548 BTUS of energy. That's 861 BTUS for 24 hours.