Use screws to secure it well to the outside wall and seal them with silicone. Then, insert the flange into the vent hole. Place silicone caulk around the edge of the flange.To allow the flange thimble to be flush against the outside wall, remove siding and shingles from around the vent hole.Use a reciprocating saw to cut out the vent hole. Near the top of the circle, bore a 1-inch hole, using a spade bit. Use a vent thimble to outline a circle on the outside wall.At the chosen spot, drill a hole from the inside Choose a point on the joist or wall to be the center of the vent hole for venting outside.Point the opening in the direction where the unit will vent to the outside. Place a section of stainless steel vent pipe on top.Then, place a connector on it and secure it with a hose clamp. Apply heat-resistant silicone sealant to the vent shaft of the new unit.You’ll need a vent kit, depending on the manufacturer. Only use pipes that are rated for this type of venting. There’s a good chance that you can vent the water heater directly through your home’s rim joist. Use the manufacturer’s instructions as a guide for venting the unit properly.Use a gas pressure test gauge before turning on the gas. After you finish making all the gas line connections, test the line.Use thread sealant designed for gas lines when making gas pipe connections.
Use two wrenches to assemble the connections towards the heater, starting at the tee.
You can use a black pipe or flexible gas supply line.
If you’re removing the down pipe for the old unit, remember to turn off the main gas line beforehand. If your current gas line is the appropriate size and you can connect to the existing tee, use a threaded black iron pipe to continue the gas line to the unit location.Unless you have strong experience with gas pipe connections, hire a licensed contractor.
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