Older water heater models may not have drain valves at the bottom of the tank making it harder to drain the water prior to replacing. If you cannot drain from the bottom through a valve, licensed plumbing specialists would suggest you drain the water from the top. Although a simple plumbing repair for plumbing contractors, a homeowner may need some assistance.
Remove all of the lines and lay the water heater near a floor drain. Attach a hose thread adapter to the top of the water heater pipe. Then after attaching a hose to the top of the water heater, lay the water heater down to drain. Leave the lead from the water heater open so air can get inside the tank for a faster drain. Also, push the open-end of the tank up so that it also draws the air.
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