Welcome! Here are the website rules, as well as some tips for using this forum.
Need to contact us? Visit https://heatinghelp.com/contact-us/.
Click here to Find a Contractor in your area.

Gluing PVC

JackW Member Posts: 236
I'm using Schedule 40 PVC for my mini boilers input and exhaust. One 90 degree for the exhaust and two for the input, should those be glued together?


  • Alan (California Radiant) Forbes
    Yes, glue AND primer.
    8.33 lbs./gal. x 60 min./hr. x 20°ΔT = 10,000 BTU's/hour

    Two btu per sq ft for degree difference for a slab
    delta T
  • Intplm.
    Intplm. Member Posts: 2,009
    The pipe and the fittings need to be primered and glued. Primer first then glue. It's a two step process.
  • heathead
    heathead Member Posts: 234
    Make sure you can use schedule 40, is it listed in boilers installation manual as approved. Also most manufactures want a tappered end "chamfer" on male pipe before being glued.
  • delta T
    delta T Member Posts: 884
    Also, make sure the PVC pipe you use for the exhaust is solid core pipe. It will typically have a pressure rating written on it, the cellular core will not and will state explicitly 'Not for pressure'. Its okay to use cell core on the intake, but not the exhaust. As Heathead says, make sure the boiler manufacturer approves the use of PVC for the venting system.
  • JackW
    JackW Member Posts: 236
    Thanks for all your comments. The pipe I am using is Schedule 40 ASTM D1785 which is what the manufacture specifies.