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An atmospheri.y vented water heater is a type with a draft hood, which Exhaust gas is . and therefore lighter than the surrounding air, . water heater and furnace in ba.t. Jupiterimages Getty Images. Venting a water heater properly requires a thorough understanding of .Before properly venting a gas water heater, it s important to determine if there is a proper natural draw .Natural gas or propane water heaters are generally less expensive to operate than electric heaters, but installing a standard vent in a house without an .