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How to Install a Storage Water Heater After shutting off the water or power supply to the tank, connect a hose to the drain valve at the bottom of the tank, open the valve, and run it to a nearby drain or to the outdoors. Use two wrenches to unscrew the inlet and outlet fittings from the top of the tank. For a water heater, shut off the inlet valve and use two wrenches to disconnect the union and the inlet valve. Also remove the flue hat that expels into the flue at the top of the tank.
After removing the old unit, set the new one in place with the controls and burner accessible. Allow at least 6 inches of clearance around its perimeter, and keep it away from flammable materials. Use a level to check it for plumb; shim the base with pieces of asphalt shingles or plastic wedges as needed.
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