Instead both systems typically expel exhaust through a pipe that runs outside through an exterior wall.
Water heater wall vent.
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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.
Direct vent water boiler.
Water heater vent pipe clearances and restrictions.
Fip x 24 in.
Push to connect x 1 in.
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.
In that installation separate intake and exhaust vent pipes are run between the water heater and interior wall and only the wall penetration and.
The difference is that a power vent water heater pulls in combustion air from the space.
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Such installation could create pyrophoric conditions and a fire hazard.
With a direct vent system air for combustion is drawn from a vent pipe that runs through an exterior wall or the roof.
A concentric vent termination may be used on a power direct vent tank or tankless water heater to get the same benefit of a single wall or roof penetration with an aesthetic vent termination.