Venting A Gas Water Heater Through The Roof

Atmospheric venting works on the principle of hot air rising.

Venting a gas water heater through the roof.

How to vent a gas water heater through the roof 1. Then add about 16 to this measurement. In the attic use the plumb bob to mark the center of the hole to be cut for the roof. Hot exhaust from the water heater naturally rises up through the vent and into the air outdoors creating a draw that promotes this upward airflow.

Traditional gas tank water heater require venting through the roof. Place the vent cap on the top end of the duct and tighten the set screws with a screwdriver. Make the vent pipe section between the water heater and the chimney as short and as straight as possible. 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. Atmospheric gas water heaters vent their exhaust through a vertical or upward sloping metal duct vent to exit the home. Standard water heaters the most common type often use a method known as atmospheric venting.

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. Tankless water heaters use fans to blow exhaust from the unit horizontally allowing vents to terminate on the side of a house. In order to do this two critical measurements must be taken. You ll need to measure the distance between the rafters where the duct will go through the roof.

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. Mark the ceiling above the water heater to receive the pipe. The vent consists of a vertical or upward sloping vent duct that typically ties into a common vent. 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.

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. Cut the hole with the jigsaw. With the exterior complete you can finish the rest of the job inside your garage.