Tankless Gas Hot Water Heater Venting

The reason is because like a standard water heater they create dangerous combustion gases when they fire.

Tankless gas hot water heater venting. Direct vent units pull in air from outside the house so they have two vents for intake and exhaust. See the use and care manual for important information regarding the venting installation and materials for your tankless water heater. If you have a gas fueled tankless water heater that is installed inside the house it needs to be vented to the outside. Traditional gas tank water heater require venting through the roof.

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 use fans to blow exhaust from the unit horizontally allowing vents to terminate on the side of a house. Power vent units use indoor air for combustion and simply vent the exhaust to the outside.

Tankless water heaters can vent through the roof or a side wall creating more flexibility and options for placement. It doesn t matter if the gas is natural gas or propane this fact remains the same. 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 are ventilated in two ways.

Power vent and direct vent. But if you have an outdoor unit then you don t need a vent as the exhaust is already outside.