Tankless venting

Discussion in 'Tankless Water Heater Forum' started by chris mclt, Jul 6, 2020.

  1. chris mclt

    chris mclt New Member

    Joined:
    Jul 6, 2020
    Location:
    louisville, ky
    I just had a tankless water heater installed. The plumber that installed it got rude with my wife so she threw him out of the house so I can't call him to come back and fix the problem. The unit works fine with the front off. If you put the front on it with in a minute of it firing it shuts off. I believe that it is starving for air. The vent is threw the roof and I believe that it is too long of a pipe and not big enough diameter. Any ideas of how to remedy this problem?
     
  2. Terry

    Terry Administrator Staff Member

    Joined:
    Aug 17, 2004
    Occupation:
    Plumber
    Location:
    Bothell, Washington
    Do you have the model number and the paperwork for the tankless water heater?
    How about a picture of the installation 800 pixels or less uploaded as an attachment.
     
  3. Sponsor

    Sponsor Paid Advertisement

     
  4. chris mclt

    chris mclt New Member

    Joined:
    Jul 6, 2020
    Location:
    louisville, ky
    Not with me but it is a Rheem prestige 199,000 BTu indoor water heater
     
  5. Terry

    Terry Administrator Staff Member

    Joined:
    Aug 17, 2004
    Occupation:
    Plumber
    Location:
    Bothell, Washington
  6. chris mclt

    chris mclt New Member

    Joined:
    Jul 6, 2020
    Location:
    louisville, ky
    I do believe that is the one
     
  7. Bannerman

    Bannerman Well-Known Member

    Joined:
    Mar 19, 2014
    Location:
    Ontario, Canada
    The specification sheet (page 2) indicates with 2" venting (exhaust and combustion air), the maximum distance will be 60' with straight pipe and no elbows, or 42' with 6- 90° elbows. Factory default DIP switch settings allow only 22' maximum distance of straight pipe so the switch settings will likely need to be changed for your installation.

    With 3" venting, max 150' or 141' with 6 elbows.
     
  8. chris mclt

    chris mclt New Member

    Joined:
    Jul 6, 2020
    Location:
    louisville, ky
    how do you change the DIP switch settings?
     
  9. chris mclt

    chris mclt New Member

    Joined:
    Jul 6, 2020
    Location:
    louisville, ky
    He used 2" pipe with 3-90's with about 25 foot of pipe
     
  10. Bannerman

    Bannerman Well-Known Member

    Joined:
    Mar 19, 2014
    Location:
    Ontario, Canada
    I couldn't locate an Installation manual from the Rheem website, but did find this YT video which discusses this matter.

     
  11. fitter30

    fitter30 Active Member

    Joined:
    Feb 2, 2020
    Occupation:
    Retired service tech
    Location:
    Peace valley missouri
    Are there fittings outside like a elbow or maybe two?
     
Similar Threads: Tankless venting
Forum Title Date
Tankless Water Heater Forum Tankless Water Heater Venting through Attic Jun 11, 2020
Tankless Water Heater Forum Rinnai Tankless RC98HPi Venting using PVC vs concentric pipe Mar 9, 2020
Tankless Water Heater Forum Concentric venting for tankless water heater May 8, 2019
Tankless Water Heater Forum Venting Tankless Water Heater to Attic via existing vent Jan 15, 2018
Tankless Water Heater Forum Newer Tankless Technology - Venting & Condensate Dec 16, 2016

Share This Page