Venting Tankless Water Heater Through Wall

The heating appliance vents directly out through a building side wall powered by natural draft provided by the heating equipment typically using a single wall metal flue or chimney or a b vent.

Venting tankless water heater through wall.

Tankless water heaters use fans to blow exhaust from the unit horizontally allowing vents to terminate on the side of a house. The direct vent water boiler is another type of water heater venting that you should know about. All water heater venting systems use a vent duct or pipe also called a chimney or flue to bring exhaust gases from the water heater to the outdoors. If the unit is installed on a basement wall the vent pipe can be run up just a few feet and then vented out the side with the use of a 90 degree elbow.

By contrast tankless water heaters vents can terminate on a side wall because their combustion fan blows exhaust from the units horizontally. Tankless water heaters are ventilated in two ways. Traditional tank gas water heaters vent through the roof using galvanized steel b vents because they work through natural draft allowing the hot exhaust air to rise up and out of the house. This vent also allows for off gasses to be unleashed outside too.

Technically you can vent your tankless heater through the chimney but only in certain circumstances. Tankless water heaters can vent through the roof or a side wall creating more flexibility and options for placement. Traditional gas tank water heater require venting through the roof. The duct may be metal or plastic depending on the type of vent system.

The air that is used for combustion will come from the water vent this vent will either through the roof or from the outside of the wall. All solid liquid or gas fueled water heater whether they are tank type or tankless must vent through the roof unless they are direct vent. 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. It really is not a good idea.

A blower or power vent draws combustion air in to the heater and a power vent pushes exhaust gases out through a separate or dedicated exhaust flue. The biggest issue is that the condensate is very acidic and will corrode the masonry of a chimney. Tankless water heaters allow for either horizontal venting out a side wall or up through the roof.