How to add tankless water condensate drain and softer drain to existing plumbing?

Discussion in 'Plumbing Forum, Professional & DIY Advice, Tips & ' started by Killer95Stang, Apr 5, 2012.

  1. Killer95Stang

    Killer95Stang New Member

    Messages:
    46
    Location:
    Southern CA
    First.. let me start by saying the water supply plumbing is no longer like this. I ripped out all of the supply piping as part of my bathroom remodel, and will be re-plumbing everything from the attic. With that out of the way, the pic below shows the current layout of the drains and vents for the toilet and sink. Right behind the sink is a water heater closet where I will be removing the tanked water heater and installing a tankless unit. I will also be adding a water softer system a few months down the road.

    What I need to know is.. Can I cut the iron pipe above the sink drain tee, add a Sani-tee (abs with No-hubs) with trap and then a stand pipe in the water heater closet. I figure it will work like a washing machine drain stand pipe. If this can't be done, can someone lead me in the right direction? Thanks.

    [​IMG]
  2. jimbo

    jimbo Plumber

    Messages:
    8,997
    Location:
    San Diego
    Well, that will work ok, and makes sense...but strictly speaking under the California plumbing code you can't do it. The pipe above the sink arm is a vent, and you can't put waste into a vent line. Also, you can't wet vent a bathroom with an appliance like a softener. You could add revent the sink around the softener tie in.
  3. Killer95Stang

    Killer95Stang New Member

    Messages:
    46
    Location:
    Southern CA
    Thanks for responding Jimbo..

    I do want the drain to be done correctly! So... can you help me understand the proper layout for a separate drain for the softener? Is it something that I can handle? I've looked up "how to properly drain a water softer" but all I see are ways how not to drain it.

    Thanks... BTW.. I'm open to all suggestions.. even if that means hiring a plumber...
  4. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,636
    Location:
    Cave Creek, Arizona
    The softener drain, because it is a "pressure flow" item can be connected below the sink, but not above it.
  5. Killer95Stang

    Killer95Stang New Member

    Messages:
    46
    Location:
    Southern CA
    So I can put a Sani-tee below the sink drain, but then the water softener drain would have to be part of a sealed drain?... Or can I still configure a stand pipe in the water heater closet behind the sink?
  6. Killer95Stang

    Killer95Stang New Member

    Messages:
    46
    Location:
    Southern CA
    Found this picture.. is this a correct way?

    [​IMG]
  7. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,636
    Location:
    Cave Creek, Arizona
    conceptually yes, but your installation might be slightly different.
Similar Threads: tankless water
Forum Title Date
Plumbing Forum, Professional & DIY Advice, Tips & Two 50 gallon LP or one 199K tankless LP water heaters? Aug 14, 2013
Plumbing Forum, Professional & DIY Advice, Tips & Any way to have a gravity recirc loop with a tankless water heater? Jul 4, 2012
Plumbing Forum, Professional & DIY Advice, Tips & Tankless water heater, recirculation pump? Mar 25, 2012
Plumbing Forum, Professional & DIY Advice, Tips & Tankless Water Heater Relocation Nov 23, 2011
Plumbing Forum, Professional & DIY Advice, Tips & Noritz NR98-OD Gas Tankless Water Heater Nov 16, 2011

Share This Page