Tankless Gas Hot Water Heater Venting

Traditional gas tank water heater require venting through the roof.

Tankless gas hot water heater venting.

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 use fans to blow exhaust from the unit horizontally allowing vents to terminate on the side of a house. Electric tankless water heaters do not need to be vented but gas tankless heaters do.

Tankless water heaters are ventilated in two ways. Power vent and direct vent. However it doesn t have to be an expensive hassle to vent. The reason is because like a standard water heater they create dangerous combustion gases when they fire.

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. The gases contain carbon monoxide. Tankless water heaters can be vented in two ways. Tankless water heaters can vent through the roof or a side wall creating more flexibility and options for placement.

Direct vent units pull in air from outside the house so they have two vents for intake and exhaust. But if you have an outdoor unit then you don t need a vent as the exhaust is already outside.