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  1. Standing in my back door, looking at my utilities, hotair furnace on left, next to it is a bocke oil fired hot water tank.
    both units vented up and over to right and up through roof.furance starts with 4″ than goes into 6″ hot water heater 6″ right
    from the start. If I want to replace the hot water tank with an on demand unit, can I use the same 6″ vent that was used for the oil fired unit?

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