Tankless water heater. Abandoned by plumber

Discussion in 'Tankless Water Heater Forum' started by Tony Fowler, Apr 17, 2021.

  1. Tony Fowler

    Tony Fowler New Member

    Joined:
    Apr 17, 2021
    Location:
    Tomball, TC
    We just had a Navien 240A tankless water heater installed to replace 2 conventional water heaters. Plumber said he would be connecting recirculating line to help speed hot water to far end of house that used to be on its own tank water heater.
    After he got all the piping done he said he still needed to come back and program the system.
    Now it’s been over a week and I can’t get him to respond to me either txt or picking up the phone.
    If all that is needed is programming, maybe I can do it with some help from this forum?
    I’ve attached pictures of plumbing coming into Navien. It does not look like an external line is coming in like I’ve seen in other pics. Although there is a T-connection returning to the hot water line and I don’t know what that is (3rd pic).
    Reviewing the manual I turned the internal pump on with valve to internal and 1st dip on. However, this only circulates water in Navien so still long wait (3min or so) to get even warm water to far end. Did plumber pipe this right?

    BC795081-018E-4D0E-AB68-C29DDB22420F.jpeg A3FA9A48-B29B-4D03-89DF-1E376A4E29BA.jpeg 35864451-99EF-4E50-96B8-A24FB5924768.jpeg
     
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  2. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Joined:
    Sep 2, 2004
    Occupation:
    Retired Systems engineer for defense industry.
    Location:
    New England
    For home hot water recirculation to work, there must be a return path back to the WH. That means either a dedicated line coming back in, or special cross-0ver valve(s) at the furthest points that then use the cold line as the return. When using hot water, that return path needs a check valve, otherwise, you'll be pulling water through both the return and the main hot supply.

    There's not enough detail shown to know what type of system you have.
     
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    Sponsor Paid Advertisement

     
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  4. Reach4

    Reach4 Well-Known Member

    Joined:
    Sep 25, 2013
    Location:
    IL
    I suspect that was not done by a plumber. Most plumbers don't use the Sharkbites so much.
     
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  5. Bannerman

    Bannerman Well-Known Member

    Joined:
    Mar 19, 2014
    Location:
    Ontario, Canada
    The Recirculation Water Supply fitting on the bottom of the NPE240A remains capped, signifying there is no recirculation return line currently connected to the WH. Here is the diagram showing Navien's recommended connections for a dedicated return line:

    [​IMG]

    Below is the diagram showing Navien's recommended connection when using Navien's NaviCirc thermostatic recirculation cross-over valve which will allow the home's cold water plumbing to be utilized as a return line when there is no dedicated return line possible. Notice the placement of the check valve located on the Domestic Water Supply inlet.

    [​IMG]

    Once a return line is installed, the appropriate settings for External Recirculation are as follows:
    [​IMG]
    [​IMG]
     
    Last edited: Apr 17, 2021
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  6. Tony Fowler

    Tony Fowler New Member

    Joined:
    Apr 17, 2021
    Location:
    Tomball, TC
    Thanks for the replies. Ugh... sounds like I have been left with more than just programming not complete.
     
  7. Tony Fowler

    Tony Fowler New Member

    Joined:
    Apr 17, 2021
    Location:
    Tomball, TC
    That does not make me feel good. Maybe just not a very good plumber or one predisposed to short cuts.
    ]
     
  8. FDNY/RETIRED

    FDNY/RETIRED Member

    Joined:
    Sep 3, 2020
    Occupation:
    Retired Lt FDNY/EMS
    Location:
    NY
    My thoughts exactly though I can't say anything bad about them. I used ball cock shark bites and a couple of 90's ant T's to add a slant/fin to my 2nd zone. From another room upstairs into to my garage. To keep some pipes warm for the winter. Also thought it would help with short cycle in that zone, by adding more element. Just seems like someone didn't like or know how to solder. I bet you paid in full and he said he be back?
     

    Attached Files:

  9. plumber69

    plumber69 In the Trades

    Joined:
    Jun 20, 2014
    Location:
    Prince Rupert, British Columbia
    Why he used CPVC instead copper? Id like to see the venting inside and outside termination. if outside termination is done wrong your unit may survive 5 years
     
  10. maxauthor18

    maxauthor18 New Member

    Joined:
    Nov 24, 2021
    Location:
    Texas. Houston
    Are you sure the plumber who installed this system was a professional? It seems that he did something wrong. The problem with heating in the far rooms is a weak pump, which does not have enough power to create the correct pressure. Replacing the pump with a more powerful one will help you fix this problem. But be prepared for the pump to become more energy-consuming. In general, the problem is that there are very few good plumbers these days. I recently learned on this site https://www.howtobecomeaplumber.org/how-long-to-become-a-plumber/ that it takes much time to become an expert in this field. Because of this, we have to deal with inexperienced artisans.
     
    Last edited: Nov 26, 2021
  11. taylorjm

    taylorjm Active Member

    Joined:
    Dec 18, 2019
    Location:
    Saginaw, Michigan
    Yup, except usually your only talking about 15psi for most boiler systems compared to 60psi for potable water. I know lots of people use sharkbites but with the ease of pex now, unless you can't get a clamp tool in a spot, pex is the better way to go.
     
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