Page 2 of 2 FirstFirst 12
Results 14 to 21 of 21
  1. #14
    Join Date
    Dec 2012
    Location
    columbus, OH
    Posts
    2,184
    Quote Originally Posted by philjafo View Post
    Better, but you've still got a power vented furnace and a naturally vented water heater sharing a flue.
    Who doesnt? Its still venting at negative pressure.

  2. #15
    Join Date
    May 2013
    Location
    STP, MN
    Posts
    159
    So why didn't the H/O have you do #'s 2-5?

  3. #16
    Join Date
    Feb 2010
    Location
    In a boiler room
    Posts
    7,220
    Quote Originally Posted by JKopp View Post
    We learned that securing only the top of w/h allowed them to walk so code dictates two straps now.

    Fau has inducer fan for combustion gases not power vented, this combo venting is allowed.
    It is allowed but not safe.

  4. #17
    Join Date
    Aug 2012
    Location
    NE wisconsin
    Posts
    403
    If the vent becomes blocked, the furnace can force exhaust out of the vent hood for the water heater. As chuck said its allowed but not safe.

  5. #18
    Join Date
    Dec 2012
    Location
    columbus, OH
    Posts
    2,184
    Quote Originally Posted by chuckcrj View Post
    It is allowed but not safe.
    Huh:? 99% of homes around here are vented in this fashion

  6. #19
    Join Date
    Dec 2012
    Location
    columbus, OH
    Posts
    2,184

    Five things wrong with this water heater install

    Makes sense if the pressure switch is bypassed as well.

  7. #20
    Join Date
    Feb 2010
    Location
    In a boiler room
    Posts
    7,220
    Quote Originally Posted by Core_d View Post
    Huh:? 99% of homes around here are vented in this fashion
    If the flue gets restricted or plugged the furnace will vent out the water heater draft hood, there is no safety to shut it down.

    It's the most dangerous code approved installation. And if someone gets CO poisoned it won't matter if you followed the code. The installer has final responsibility for safe operation.

  8. #21
    Join Date
    Aug 2008
    Location
    San Clemente, CA
    Posts
    1,240
    Our area requires fau to breath outside air and in this case the w/h too. The w/h vent was spilling regardless of the fau combo vent as it was not vented correctly. I will let the plumber fix his issues as I am not a licensed plumber, only a C20 licensed HVAC contractor.

Page 2 of 2 FirstFirst 12

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Comfortech Show Promo Image

Related Forums

Plumbing Talks | Contractor Magazine
Forums | Electrical Construction & Maintenance (EC&M) Magazine
Comfortech365 Virtual Event