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.

Tankless gas hot water heater venting.

Tankless water heaters can be vented in two ways. Tankless water heaters are ventilated in two ways. Power vent units use indoor air for combustion and simply vent the exhaust to the outside. 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.

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. However it doesn t have to be an expensive hassle to vent. Tankless water heaters can vent through the roof or a side wall creating more flexibility and options for placement.

The gases contain carbon monoxide. It doesn t matter if the gas is natural gas or propane this fact remains the same. The reason is because like a standard water heater they create dangerous combustion gases when they fire. But if you have an outdoor unit then you don t need a vent as the exhaust is already outside.

Power vent and direct vent. Electric tankless water heaters do not need to be vented but gas tankless heaters do.