about 150 lbs. Click to see full answer. Regarding this, how heavy is an empty 40 gallon hot water heater?An average 40-gallon water heater is going to weigh around 120 pounds. can I flush my own water heater? To flush your hot water tank, simply turn on the cold water spigot leading into your hot water tank. Let it run for a few minutes until the water exiting your hose runs clear. As you can see, I still had some sediment (can be seen at the bottom) coming out. Moreover, how much does a 50 gallon water tank weigh full? SMALL AQUARIUMS Tank Size L x W x H Filled Weight 50 gallon 36″ x 18″ x 19″ 600 lbs 55 gallon 48″ x 13″ x 21″ 625 lbs 65 gallon 36″ x 18″ x 24″ 772 lbs How can you tell when a hot water heater is full?Open a faucet with the water pump ‘on’, or connected to city water, and when water runs out the hot faucet without ‘belching’ air, the water heater is full. When you turn the faucet on/off and it acts like your home water faucet, it’s OK.
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