replacing old oil fired water heater and oil fired furnace.

Discussion in 'Water Heater Forum, Tanks' started by quarry, Jan 3, 2012.

  1. quarry

    quarry New Member

    Jan 3, 2012
    Upstate NY
    furnace.jpg I have a 40 year + old Ford Oil Fired water heater and a 40 year+ williamson 5 in 1 furnace. So its time!!!. the furnace has a 6" flue and the old water heater has a 6" flue. They are both Tee'd in to an Amerivent Model FB 7" Factory Built all Fuel Chimney. The origional builder did a real nice job, see pic. I am looking at the Toyotomi OM148 instant hot water heater ( 148K BTU )and a new Generic oil furnace/AC unit of about 150K BTU/ 3.5 Ton. The million dollar question is can I Vent the new Toyo water heater ( 148K BTU ) and the new furnace ( 150K BTU ) through the existing 7" chimney. The Toyo stove has a 4" vent that has a 5" chimney adapter accessory and is a positive draft design and the furnace will be 6" natural draft. I know the rule smaller vent on top where entering main stack and also the Toyo pos draft Vent to be atached with Y pipe. Not sure how the positve draft and neutral draft work in harmony if they do at all.

    The NFPA31- 6.5.19 states, Connectors serving appliances operating under natural draft shall not be connected into any portion of a mechanical draft system operating under positive preasure.

    With that being said, i only have a hundred and one visions of what they mean. Any Plumber out there who really comprehend this stuff.

    Thanks Roy
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