Venting of a tankless water heater in accordance with the manufacturer s directions is very important in order to install the water heater.
How to install water heater vent through roof.
Go into your attic.
This will allow your water heater to operate efficiently and effectively and most significantly it will avoid any probability of danger and therefore the risk of carbon monoxide gas poisoning.
In the attic use the plumb bob to mark the center of the hole to be cut for the roof vent boot.
Mark the ceiling above the water heater to receive the pipe.
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.
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.
With the pipe in a vertical position trace around the pipe using a pencil.
Mark the ceiling above the water heater to receive the pipe.
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.
Cut the hole with the jigsaw.
The penetration will be oval to have a round pipe exit vertically through a pitched roof you need an oval hole in the roof.