How Do I Vent My Water Heater Through The Roof

Vent adapter is needed to connect the water heater which is tankless to the exhaust hose.

How do i vent my water heater through the roof.

The penetration will be oval to have a round pipe exit vertically through a pitched roof you need an oval hole in the roof. Select either an adapter of three inch or an adapter of four inches depending on what water heater model you decide. Once you determine the size you need to calculate the length of duct needed. The vent consists of a vertical or upward sloping vent duct that typically ties into a common vent.

To make venting easiest install your tankless water heater on an outside wall. With the pipe in a vertical position trace around the pipe using a pencil. Tankless water heaters can vent through the roof or a side wall creating more flexibility and options for placement. Mark the ceiling above the water heater to receive the pipe.

To do this you need a duct that is the same size diameter as the vent flange on your heater. Position the vent pipe up to the bottom of the roof. In the attic use the plumb bob to mark the center of the hole to be cut for the roof vent boot. Use the plumb bob to be certain the center of the pipe at the ceiling and the center or the boot on the water heater are lined up.

If it is a natural vent type water heater you can not vent it through the side wall it has to vent above the roof. Tankless water heaters use fans to blow exhaust from the unit horizontally allowing vents to terminate on the side of a house. Other issue is the bathroom installation which isn t permitted as well unless the water heater closet is sealed from the bathroom area air tight doors and it has a separate fresh air supply from exterior or other areas of the house that can be used for this purpose. If the unit is installed on a basement wall the vent pipe can be run up just a few feet and then vented out the side with the use of a 90 degree elbow.

Whenever we are installing a gas water heater building codes require that there should be a ventilator out of the room through the attic and out through the roof. The system works solely through natural convection based on the principle that hot air rises. All emission of liquid or gas water heaters which are tankless needs vent pipes made of stainless steel and approved by ul. 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.

Installing your tankless water heater for easier venting. One of the most common methods of venting your garage heater is by running the vent through the roof. To do this two critical measurements must take one on the ceiling above the water heater and one that is the distance from the attic floor to the roof. Traditional gas tank water heater require venting through the roof.

Standard water heaters the most common type often use a method known as atmospheric venting.