(206) 949-5683, Top Rated Plumber, Seattle
Results 1 to 2 of 2

Thread: Shower Valves and Tankless water heater

  1. #1
    DIY Junior Member morpho's Avatar
    Join Date
    Mar 2012
    British Columbia

    Default Shower Valves and Tankless water heater

    Okay, first I'll say I am aware of the shortcomings of Tankless units. But I have lived with one for 7 years and not had a problem with it at all.
    I love the stupid thing!

    BUT! I have been using it in a cabin/makeshift setting where I simply had Cold water pumping into it and out to a shower head. (no valve and no cold to mix into it)

    Well I am about to do the plumbing to the bathroom in my new house and it's going to be a right proper shower with hot and cold runnin' water!
    My concern is what effect a pressure regulating or thermostatic valve will have on the Tankless.

    (my preference would be to have old school manual valves hot and cold and the two simply meet and mix but these are no longer allowed by code....the tankless already serves as the scald protector as it is set to a specific temp and never fluctuates)

    Anybody have some advice?
    Some experience?

    Thanks a bunch.

  2. #2
    DIY Junior Member StillGoing's Avatar
    Join Date
    Sep 2012
    Los Angeles


    I'm not sure why you didn't get an answer on this earlier but I think the answer is pretty basic.

    Your hot water heater is the start of all of your hot water piping. You already have it to the shower, so you are half done. Now run a separate coldwater pipe to the shower and connect them to your pressure-balancing valve to the shower. The fact is you don't have a right proper shower with hot and cold water unless you do.

    You still want the pressure balancing valve in case someone flushes a toilet or the automatic icemaker comes on. The valve has a separate anti-scald protection in case some joker fiddles with your temp setting on the heater. You didn't say what temperature you have it set at.

    If you use the hottest setting the valve will be passing all the water from the hot water heater most of the time but it needs both inputs connected to water at similar pressure to work.

Similar Threads

  1. Delta Monitor Shower Valves and Takagi tankless heater problems
    By hptulsa in forum Shower & bathtub Forum & Blog
    Replies: 0
    Last Post: 10-27-2011, 11:56 AM
  2. Should a Water heater have two check valves?
    By wombat in forum Water Heater Forum, Tanks
    Replies: 5
    Last Post: 08-21-2011, 01:25 PM
  3. in shower tankless water heater
    By bbsux in forum Tankless Water Heater Forum
    Replies: 6
    Last Post: 08-17-2009, 10:46 PM
  4. Tankless Water Heater for Tub
    By BlackNoir in forum Shower & bathtub Forum & Blog
    Replies: 0
    Last Post: 03-23-2009, 08:12 PM
  5. Tankless Water Heater
    By shall in forum Shower & bathtub Forum & Blog
    Replies: 13
    Last Post: 04-11-2007, 08:40 AM


Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts