Combining condensate drains?

Discussion in 'Boiler Forum' started by CallmeJake, Apr 6, 2021.

  1. CallmeJake

    CallmeJake New Member

    Oct 23, 2018
    Ann Arbor, Michigan
    I have two boilers in the basement, one is a combi, between them I have 6 pipes to route to the drain. 3 relief valves, 2 condensate, and the backflow. The two condensate lines currently run over to floor drain, while the others dump on the floor. I've found that the floor doesn't really slope to the drain so if any of the relief valves pops it just puddles on the floor.

    Can I have all 6 dump into one line and run that over to the drain? I think it is OK if I maintain an air gap between the outlet of each unit and the line to the drain but I am not sure.
  2. fitter30

    fitter30 Well-Known Member

    Feb 2, 2020
    Retired service tech
    Peace valley missouri
    It will be ok the way you described.
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  4. Reach4

    Reach4 Well-Known Member

    Sep 25, 2013
  5. Splashoil

    Splashoil Retired!

    Apr 30, 2021
    Retired fitter
    Bellingham, WA
    I made a 6”x24” pvc riser and filled with marble chips. All condensate goes there where the marble helps neutralize
    The acid before it gets on the concrete lol. Actually I brought a 2” pvc line under the boiler floor with trap and a funnel
    Drain to carry away the acid. There are codes involved. A friend dumped his outside his garage and trashed the soil and landscaping before he got smart.
    Photo shows cheap neutralizer.

    Attached Files:

    Last edited: May 1, 2021
    breplum likes this.
  6. breplum

    breplum Member

    Oct 2, 2004
    Plumbing and heating contractor
    San Francisco Bay Area
    First, put actual condensate neutralizer sets on each condensate line.
    Then if you want to combine them to travel away, size the common drain to handle the load.
    I don't know what your backflow is, but they would like a bigger pipe if they ever blow. But, if you don't care about a wet floor....
    Relief valves are technically required to have the combined area accommodate full flow on all valves at once, which would be bizarre but, nevertheless, required.
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