Direct vent gas water heaters are a type of gas water heater best suited for use when there is insufficient ventilation within the installation space in your home.
Direct vent tankless gas hot water heater.
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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.
For most direct vent systems two pipes are used.
Direct vent tankless water heaters require no extra power the exhaust gas is drawn out vertically through separate vent duct.
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But many manufacturers now adopt concentric vents only.
One is for intake while the other for exhaust.
For pricing and availability.
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The exhaust gases and excess heat produced by your water heater are then vented back outdoors.
Tankless water heaters are ventilated in two ways.
Power vent and direct vent.