Venting a hot water heater through the wall atmospheric water heater.
Venting a gas water heater through wall.
Direct vent water heaters with a direct vent system air for combustion is drawn from a vent pipe that runs through an exterior wall or the roof.
The only other option is an electric water heater which requires no vent.
Direct vent water boiler.
The atmospheric water heater is very common.
This water heater is found in different homes.
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.
The direct vent water boiler is another type of water heater venting that you should know.
Instead both systems typically expel exhaust through a pipe that runs outside through an exterior wall.
The difference is that a power vent water heater pulls in combustion air from the space.
Exhaust gases are vented outdoors through a separate vent duct or through a separate chamber of the same pipe this requires a double wall vent duct.