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The US gallon is legally defined as 231 cubic inches, which is exactly 7000378541178400000â 3.785411784 liters. A US liquid gallon of water weighs about 8.34 pounds or 3.78 kilograms at 62 Â°F (17 Â°C), making it about 16.6% lighter than the imperial gallon. There are four quarts in a gallon, two pints in a quart and 16 US fluid ounces in a US pint, which makes the US fluid ounce equal to 1â128 of a US gallon.
An empty forty gallon electric water heater weighs between 110 and 130 lbs. depending on make. Fresh water weighs 8.333 lbs per gallon so if the tank was full it would weigh 443.32 to 463.32 lbs. Jill, The answer is: 130 lbs for the water heater Plus 40 gallons of water @ 7.58 lbs per pound of water = 433.2 total lbs.