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  1. #1
    Join Date
    May 2012
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    Upper Michigan
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    Don't see this much

    Oil fired wtr heater. Name:  ImageUploadedByTapatalk1349219457.801671.jpg
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  2. #2
    Join Date
    Jul 2009
    Location
    Columbia, MD
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    3,384
    why do oil furnaces always get freakin barometric dampers but, everyone is so dang scared to install a barometric on a gas appliance.

    geeeeeezzz!!

  3. #3
    Join Date
    Aug 2012
    Location
    NE wisconsin
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    392
    Quote Originally Posted by gravity View Post
    why do oil furnaces always get freakin barometric dampers but, everyone is so dang scared to install a barometric on a gas appliance.

    geeeeeezzz!!
    Because the gap between the water heater and the vent pipe serves that purpose and it doesn't need one.

  4. #4
    Join Date
    Feb 2010
    Location
    In a boiler room
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    Quote Originally Posted by philjafo View Post
    Because the gap between the water heater and the vent pipe serves that purpose and it doesn't need one.
    A draft hood (or gap as you put it) serves a completely different purpose than a barometric. According to ASHRAE a draft hood isolates the appliance from the flue allowing combustion to take place without venting action. Since it disconnects the appliance, draft and air through the burner is completely uncontrolled. Draft hoods are designed for a specific set of conditions, which are; a vent of not more than 5 ft in height with 1 or 2 elbows. How often do those conditions get met in the field???

    A barometric or draft regulator on the other hand allows for a consistent amount of air through the burner that does not change with changing conditions. Those of us who test for CO find draft hoods spilling quite often, either with higher than normal or lower than normal flue draft pressure. They are not safe under all conditions! A draft regulator is the only way to fix them. A spill switch added to the bottom of a double swing barometric will shut down the burner if the flue gets blocked.

  5. #5
    Join Date
    Aug 2012
    Location
    NE wisconsin
    Posts
    392
    Quote Originally Posted by chuckcrj View Post
    A draft hood (or gap as you put it) serves a completely different purpose than a barometric. According to ASHRAE a draft hood isolates the appliance from the flue allowing combustion to take place without venting action. Since it disconnects the appliance, draft and air through the burner is completely uncontrolled. Draft hoods are designed for a specific set of conditions, which are; a vent of not more than 5 ft in height with 1 or 2 elbows. How often do those conditions get met in the field???

    A barometric or draft regulator on the other hand allows for a consistent amount of air through the burner that does not change with changing conditions. Those of us who test for CO find draft hoods spilling quite often, either with higher than normal or lower than normal flue draft pressure. They are not safe under all conditions! A draft regulator is the only way to fix them. A spill switch added to the bottom of a double swing barometric will shut down the burner if the flue gets blocked.
    So your saying a 30 foot horizontal run is no good for a water heater
    Good point though on tje differnce between draft hood and barometric damper, ones powered and the others just natural drafted. Two totally different animals.

  6. #6
    Join Date
    Feb 2010
    Location
    In a boiler room
    Posts
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    Quote Originally Posted by philjafo View Post
    So your saying a 30 foot horizontal run is no good for a water heater
    Good point though on tje differnce between draft hood and barometric damper, ones powered and the others just natural drafted. Two totally different animals.
    Even natural drafted appliances work far better with a barometric than with a draft hood.

  7. #7
    Join Date
    Dec 2007
    Posts
    4,575
    Quote Originally Posted by philjafo View Post
    So your saying a 30 foot horizontal run is no good for a water heater
    Good point though on tje differnce between draft hood and barometric damper, ones powered and the others just natural drafted. Two totally different animals.

    what?

    both are natural draft!!

    barometric damper has not fan/power.

    I service 4 or 5 of these on maintenance policies. never had to clean one, but they probably should be done.
    The Food Stamp Program, administered by the U.S. Department of Agriculture, is proud to be distributing the greatest amount of free meals and stamps EVER.
    Meanwhile, the National Park Service, administered by the U.S. Department of the Interior, asks us to "Please Do Not Feed the Animals". Their stated reason for this policy "... the animals become dependent on handouts and will not learn to take care of themselves."
    from an excerpt by Paul Jacob in Sun City, AZ

  8. #8
    Join Date
    Feb 2010
    Location
    In a boiler room
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    Quote Originally Posted by gravity View Post
    why do oil furnaces always get freakin barometric dampers but, everyone is so dang scared to install a barometric on a gas appliance.

    geeeeeezzz!!

  9. #9
    Join Date
    May 2012
    Location
    Upper Michigan
    Posts
    3,585
    Quote Originally Posted by gravity View Post
    why do oil furnaces always get freakin barometric dampers but, everyone is so dang scared to install a barometric on a gas appliance.

    geeeeeezzz!!
    Not sure, we never install 80% up here so never thought of it lol.


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  10. #10
    Join Date
    Apr 2011
    Location
    Coastal Maine
    Posts
    773
    I wouldn't put this in the wall of shame. Other than the unsleeved oil line, these old Aero's worked fine. Bock's were the same. They can make more hot water than a family can use.

  11. #11
    Join Date
    May 2006
    Posts
    325
    might not have been code when it was installed in my area its grandfatherd untill you replace the line tank or valves

  12. #12
    Join Date
    May 2012
    Location
    Upper Michigan
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    Quote Originally Posted by meplumber View Post
    I wouldn't put this in the wall of shame. Other than the unsleeved oil line, these old Aero's worked fine. Bock's were the same. They can make more hot water than a family can use.
    Oil is very expensive is all


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  13. #13
    Join Date
    May 2012
    Location
    Upper Michigan
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    Quote Originally Posted by philjafo View Post
    Because the gap between the water heater and the vent pipe serves that purpose and it doesn't need one.
    I was thinking furnace for some dumb reason


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