Tankless Gas Hot Water Heater Venting

Tankless water heaters use fans to blow exhaust from the unit horizontally allowing vents to terminate on the side of a house.

Tankless gas hot water heater venting.

If you have a gas fueled tankless water heater that is installed inside the house it needs to be vented to the outside. Electric tankless water heaters do not need to be vented but gas tankless heaters do. The gases contain carbon monoxide. See the use and care manual for important information regarding the venting installation and materials for your tankless water heater.

All indoor tankless gas water heaters must be vented vertically or horizontally to the outdoors using factory approved venting material no other venting material is permitted. Tankless water heaters can be vented in two ways. Power vent and direct vent. Direct vent units attract outside air from the house or building while power vent units solely need an exhaust vent and should be installed in a larger area for receiving sufficient air amount for combustion.

Direct vent units pull in air from outside the house so they have two vents for intake and exhaust. Tankless water heaters can vent through the roof or a side wall creating more flexibility and options for placement. The reason is because like a standard water heater they create dangerous combustion gases when they fire. However it doesn t have to be an expensive hassle to vent.

Power vent units use indoor air for combustion and simply vent the exhaust to the outside. Traditional gas tank water heater require venting through the roof.