Venting A Gas Water Heater Through The Roof

Cut the hole with the jigsaw.

Venting a gas water heater through the roof.

This venting may either be dedicated to the water heater or can be shared with other atmospheric vent appliances such as a furnace. Tankless water heaters can vent through the roof or a side wall creating more flexibility and options for placement. Atmospheric venting refers to a system in which exhaust from the water heater naturally rises out of the appliance s combustion chamber then travels up through a standard chimney style flue that. In the attic use the plumb bob to mark the center of the hole to be cut for the roof.

Atmospheric gas water heaters vent their exhaust through a vertical or upward sloping metal duct vent to exit the home. The common rule is that the horizontal part of the single wall vent pipe must be equal or shorter than 75 of it s total developed height. Place the vent cap on the top end of the duct and tighten the set screws with a screwdriver. Mark the ceiling above the water heater to receive the pipe.

You will now insert the long portion of your duct through the hole in the roof from below until it s about 24 above the roof shingles. When installing a gas water heater building codes requires that they be ventilated out of the room through the attic and out through the roof. Standard water heaters the most common type often use a method known as atmospheric venting. Use a plumb bob to be sure the center of the tube at the.

One on the ceiling above the water heater and one that is the distance from the attic floor to the roof. In order to do this two critical measurements must be taken. The vent consists of a vertical or upward sloping vent duct that typically ties into a common vent. Tankless water heaters use fans to blow exhaust from the unit horizontally allowing vents to terminate on the side of a house.

Illustrations of proper gas fired water heater venting using type b double wall vent pipe through a roof above or through a chimney below include details for the flue vent connector such as the requirement of a minimum vent connector upwards slope of 1 4 per foot of horizontal run. With the exterior complete you can finish the rest of the job inside your garage. Atmospheric venting works on the principle of hot air rising. You ll need to measure the distance between the rafters where the duct will go through the roof.

Make the vent pipe section between the water heater and the chimney as short and as straight as possible. How to vent a gas water heater through the roof 1. Traditional gas tank water heater require venting through the roof.