Tankless Water Heater Exhaust

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.

Tankless water heater exhaust.

If a tankless water heater is not vented properly a number of things can happen. See the use and care manual for important information regarding the venting installation and materials for your tankless water heater. Direct vent units pull in air from outside the house so they have two vents for intake and exhaust. The exhaust is a gas condensate that is highly acidic and corrosive to the venting so they require the right material.

Tankless water heaters are ventilated in two ways. 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. 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.

Condensing tankless water heaters lower the cost of installation. Power vent and direct vent. Power vent units use indoor air for combustion and simply vent the exhaust to the outside. Tankless water heaters can be vented in two ways.

Power vent units use indoor air for combustion and simply vent the exhaust to the outside. All of them unpleasant and some quite dangerous.