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how does a direct vent gas hot water heater work.

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How does a direct vent gas hot water heater work?
asked in Gas Water Heater by fritz425 (120 points)
edited by darekrudy
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1 Answer

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Hi Fritz425,
Basically the direct vent type appliance (water heater, furnace, fireplace, etc.) has an exhaust gases discharge pipe and a fresh air intake pipe installed in two configurations.
As a single assembly with double walls where the center section acts as an exhaust vent and a space between the two, inner and outer, pipes direct the combustion fresh air supply straight to the burner chamber.
Two pipe assemblies operate the same way, they just have a separate intake and exhaust pipe.
Since the combustion chamber is completely sealed, isolated from the interior of the house, a direct vent appliance (e.g. water heater) can be installed in areas where an appliance utilizing interior air for combustion cannot.
Let me know if you have more questions.
answered by darekrudy (21,730 points)