Tankless Hot Water Heater Exhaust

The exhaust fan is activated then the gas valve is opened and the burner is ignited.

Tankless hot water heater exhaust.

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

Tankless water heaters can be vented in two ways. Direct vent units pull in air from outside the house so they have two vents for intake and exhaust. Power vent units use indoor air for combustion and simply vent the exhaust to the outside. Tankless water heaters use fans to blow exhaust from the unit horizontally allowing vents to terminate on the side of a house.

Tankless water heaters with condensing technology are up to 95 more efficient than non condensing units and emit a comparatively cooler exhaust gas according to the propane education and research council. How water is heated in a tankless water heater when you turn on your hot water tap it begins to pull water through the intake pipe. Tankless water heaters can be vented in two ways. The exhaust is a gas condensate that is highly acidic and corrosive to the venting so they require the right material.

Condensing tankless water heaters lower the cost of installation. Direct vent units pull in air from the outside so they have two vents for intake and exhaust. All of them unpleasant and some quite dangerous.