Condensate draining

Discussion in 'Plumbing Forum, Professional & DIY Advice, Tips & ' started by rharrington, Jan 30, 2006.

  1. rharrington

    rharrington New Member

    Messages:
    3
    Location:
    Allentown, PA
    I am going to be installing a weil-mclain ultra-80 gas boiler and have worked out all the issues except how to deal with the condensate. I have a 1920's twin with cast iron DWV and no drain in the basement. Any suggestions on how to get rid of the condensate from the boiler?

    Thanks
  2. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    21,994
    Location:
    New England
    If you haven't got someplace to gravity drain the stuff, then you'll need a condensate pump. This could go to the washing machine drain, if it has enough slope, or could be pumped there with the pump.
  3. rharrington

    rharrington New Member

    Messages:
    3
    Location:
    Allentown, PA
    More info

    I don't have a place to gravity drain it, and my wahing machine is on the 1st floor. Does this mean I am going to have to cut into the cast iron pipe and install a drain trap, etc?
  4. finnegan

    finnegan New Member

    Messages:
    250
    Location:
    CT
    You can cut into the case iron or just pump it outside.
  5. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    21,994
    Location:
    New England
    Pumping outside in freezing weather is often not a good solution...you could pump it upstairs to the washing machine standpipe, or you'd have to make a connection into the sewer someplace convenient (is that an oxymoron?).
  6. plumber1

    plumber1 Plumber

    Messages:
    1,423
    Location:
    Florida
    boiler

    I'm not sure exactly what you mean, but why cant you drain the steam line gravity back to the bottom of the the boiler?

    Guess I don't know what: twin with cast iron DWV....is.

    What did the old boiler do with condensate?
  7. Bob NH

    Bob NH In the Trades

    Messages:
    3,317
    Location:
    New Hampshire
    There are lots of little condensate pumps that will pump through a flexible tube or anything else to get rid of 20 gallons per hour against 15 ft of head. They cost in the range of $40 to $60.
  8. rharrington

    rharrington New Member

    Messages:
    3
    Location:
    Allentown, PA
    So I should get a condensate pump, and then just tap it into the cast iron sewer pipe? Do I need to install a trap for that, or just punch a hole big enough for the tube from the pump to fit in and then seal it off with caulk?
  9. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    21,994
    Location:
    New England
    The high efficiency boilers (and furnaces) cool the exhaust so much that the water component of combustion condenses...it needs to be disposed of. Punching a hole in the drain is not goingto cut it...you'd probably need a trap, but since it is being pumped, I'm not sure if you need a vent. One of the pros will have some ideas on what meets code, and what would be the easiest. If you could pump it to your washing machine stand pipe, it might be the easiest, even if it is on the floor above.
  10. dubldare

    dubldare Plumber/Gasfitter

    Messages:
    286
    Location:
    MN/ND
    All traps require vents. All connections to the sanitary sewer system require traps.

    Simple logic would deduce that a trap receiving 'pumped' discharge would need venting much more than semi-continuous low volume discharge: higher discharge velocity makes for a greater siphon than a semi-continuous drip.

    If the pipe you plan on attatching to receives waste from above, you most definately need a vent.
  11. Bob NH

    Bob NH In the Trades

    Messages:
    3,317
    Location:
    New Hampshire
    You're looking at a trickle of water. Can you find a way to put a 3/8" Tygon tube into the top of a toilet tank, or into the same drain that a washing machine discharges to, or a laundry sink? If you have a sump pump you can dump it into the sump. I would do everything possible to avoid making it a plumbing project.
  12. finnegan

    finnegan New Member

    Messages:
    250
    Location:
    CT
    Many inspectors will allow you to just drill a hole in a cleanout and insert the condensate tube. I know that is not an option for you here, but it is an example of how inspectors will often tolerate creativity with condensate pumps. As far as a trap, code would require a vent, including an AAD, but the pump would work with no trouble without the vent. It really is not a large volume of water. The way traps are constructed for these pumps is usually to use a 1 1/2" trap and then a 2" - 1 1/2" reducer fitting so that the 2" side is up. The condensate pump tube is hung above the bell so that it drips in and creates an air gap to avoid a siphon effect. I still say the easiest way is to just pump it outside. As long as you are not running it onto a sidewalk or your driveway, you should have no trouble.
  13. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    21,994
    Location:
    New England
    The block of ice could be pretty messy, but if you can live with that, it may be the easiest. The colder it is, the bigger it will be and the more chance of it freezing up. Hassle is, if you run it away from the foundation, it might freeze up. If you don't, you might end up with some of it back in the basement.
  14. dubldare

    dubldare Plumber/Gasfitter

    Messages:
    286
    Location:
    MN/ND

    Show me an inspector, properly schooled in the ways of plumbing, who would allow that.

    While yes, it may be creative, it is most definately not sanitary.

    How detrimental may such a use be is unknown, but it is most definately not sanitary. Such talk/advise should not be allowed.
  15. finnegan

    finnegan New Member

    Messages:
    250
    Location:
    CT
    It has worked in Northern NJ. I don't ask for an inspector's education background, just if he is ok with it.
  16. dubldare

    dubldare Plumber/Gasfitter

    Messages:
    286
    Location:
    MN/ND
    Show me a plumber, properly educated in his craft, that would do such a thing.

    I have a 48" pipe wrench that would like to meet him....lol
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