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What is the difference between a direct vent water heater and a power direct vent water heater and how do you know if you need one or the other?

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Generally, a direct vent must be next to an outside wall or be connected to a chimney that extends 2-4 feet above roof peak (all gases and fumes from the burner will vent naturally). A power vent is used when the unit is put inside the home in a closet or on an interior wall. It must have venting to an outside wall and must have a blower fan to remove gases from the water heater so they don't back up into the house.
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