Venting A Gas Water Heater 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.

Venting a gas water heater through the roof.

Traditional gas tank water heater require venting through the roof. Cut the hole with the jigsaw. 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. You ll need to measure the distance between the rafters where the duct will go through the roof.

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. Atmospheric venting works on the principle of hot air rising. Atmospheric gas water heaters vent their exhaust through a vertical or upward sloping metal duct vent to exit the home. In the attic use the plumb bob to mark the center of the hole to be cut for the roof.

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. How to vent a gas water heater through the roof 1. Tankless water heaters use fans to blow exhaust from the unit horizontally allowing vents to terminate on the side of a house. Then add about 16 to this measurement.

The vent consists of a vertical or upward sloping vent duct that typically ties into a common vent. The system works solely through natural convection based on the principle that hot air rises. In order to do this two critical measurements must be taken. Tankless water heaters can vent through the roof or a side wall creating more flexibility and options for placement.

One on the ceiling above the water heater and one that is the distance from the attic floor to the roof. With the exterior complete you can finish the rest of the job inside your garage. 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. 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.

This venting may either be dedicated to the water heater or can be shared with other atmospheric vent appliances such as a furnace. Place the vent cap on the top end of the duct and tighten the set screws with a screwdriver. Use a plumb bob to be sure the center of the tube at the.