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INSTALLING THE NEW HEATER
Move your new heater to its location by "walking" it or by using an appliance cart, dolly, or hand truck. Position the new heater so you’re piping–particularly a gas vent pipe–will reach easily.
For a gas heater, install the heater's new draft hood. Many heaters have legs that insert into holes on the heater's top. Every gas water heater needs proper venting that's no smaller than the draft hood collar of the new heater. It's a good idea to use new vent pipe elbows, since the old ones are probably corroded at their present angles. The vent should go straight up as far as possible. Any horizontal run in the vent should slope upward at least 1/4" per foot, as shown. Connect the vent pipe with short sheet metal screws.
Now you can make the hot and cold water connections. The type of materials you use will depend on your local code and the type of material used in the existing system.
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