In seven easy steps, you will remove your old water heater.
However, keep in mind that your tank might be heavy.
Sediment build-up during many years of its operation made it heavy. This is why you need help.
Removing an old water heater - Instructions
Turn the gas supply OFF to the gas heater.
Turn the water supply OFF to the unit.
Disconnect the electrical power if applicable.
Disconnect the gas pipe that leads to the gas control valve.
Draining. Open the nearest hot water tap and let it run until the temperature is lower than 100 F, so you don't burn yourself or damage the property. Draining all the water will help you remove the old unit as it would weigh much less. Connect the hose to the drain valve and terminate the other end of the hose to an adequate drain, away from people and your property. Open the drain valve and empty the tank.
Disconnect the vent pipe from the top of the gas heater. The vent pipe is usually connected to the draft hood with sheet metal screws. This applies to atmospheric-vent units. Disconnecting a power vent and a direct vent is maybe a bit harder but is not complicated.
Find the two pipes at the top of the unit. These are an incoming supply of cold and outgoing hot water. If pipes are made of copper, use the hacksaw and cut them approximately four inches from the unit. If the pipes are galvanized and use unions, use the pipe wrench and loosen them to disconnect the heater from the plumbing completely. Now you can remove an old hot water heater completely.
Removing an old electric water heater is even easier as you don't have to deal with the gas supply.
The only thing you have to make sure of is to disconnect the wiring from the heater and mark them for later installation.
The total time to remove the old water heater is approximately 2-3 hours. If you have the necessary tools, have some basic electrical, gas, and plumbing skills, including soldering pipes and the help of one or two friends, you can remove the old hot water heater relatively fast. Draining takes the longest, and it depends on the size of the tank.
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