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  1. #1
    Join Date
    Dec 2013
    Posts
    1

    Default In shower: Hot water initially, followed by luke warm to warm water

    We had a new hot water heater put in about eight months ago. Initially, hot water from the new water heater was almost immediate, even in our most distant shower and stayed hot. However, after a couple of weeks, we started to notice that the water would quickly turn to luke warm or warm after initially being hot. Water from all of our faucets that have a hot and cold valve runs hot. However, water from any faucet that has a single mixing valve behaves as described. Moreover, if you are taking a shower and run hot water from any other faucet in the house, the shower goes from the luke warm or warm state to ice cold and stays that way for a long time, as though the hot water line has filled with cold water. Checked the pipes coming from the water heater and their temp does not fluctuate -- feels hot the whole time. Does anyone have any bright ideas?

  2. #2
    Join Date
    Dec 2010
    Location
    Houston Texas
    Posts
    2,969

    Default Re: In shower: Hot water initially, followed by luke warm to warm water

    Sounds like you have shower valves that have built in thermostatic controls which alters the temperature to prevent scalding. These may be adjusted too low for your HWH setting.

    Have you checked the HWH? Is it set at a normal operating temperature?

  3. #3
    Join Date
    Sep 2012
    Location
    Boston
    Posts
    1,004

    Default Re: In shower: Hot water initially, followed by luke warm to warm water

    one thing that comes to mind which happens in my house. if you turn on just the cold water after having not have turned on any faucet for about a half hour or so, the water comes out cool. after 30 seconds to a minute, the water gets cooler. which happens because the water in the basement pipes has warmed up from being 4-6 feet below ground level outside to being in the warmer basement. after the warmer water goes down the drain it gets cooler, considerably so during the winter months. if the water in the mixing valve is mixing 112 degree hot water with 60 degree cold water then the cold water temp drops to 45-50 degrees (which could take anywhere from 30 seconds to about 2 minutes), the valve will have to be adjusted to add more hot water to keep the temp constant.

    not sure if that's the case, i'm just offering it as a possibility.

  4. #4
    Join Date
    Jul 2010
    Location
    SoCal
    Posts
    6,736

    Default Re: In shower: Hot water initially, followed by luke warm to warm water

    If you don't have your faucet manual, get it on line. Then follow the trouble shooting guide and adjust the temperature limits.

  5. #5
    Join Date
    Jan 2008
    Posts
    2,203

    Default Re: In shower: Hot water initially, followed by luke warm to warm water

    The condition of your water may have a role here, but I've never heard of anything getting clogged up this fast before. More likely is that some debris from the re-plumbing found it's way into the wrong place. Dismantle and clean all parts of the valve, flushing the lines when it's all apart (two-person job, one at shower with towels etc. in direct communication with another at the supply valves or you'll have water going everywhere). Stopper the drain so you can see if any debris came out and what it is. That will give you a hint at what you night need to do in the future to prevent a recurrence.

    Phil

  6. #6
    Join Date
    Dec 2013
    Location
    Montreal Canada
    Posts
    211

    Default Re: In shower: Hot water initially, followed by luke warm to warm water

    You might have a by pass some where. what that means is that the hot is connected directly to the cold.,check all water connections to see if this the problem you might need a plumber to do this. an example of this is a mixer in the garage that mixes hot and cold water to give warm water at hose connection. when you turn on your shower faucet the cold water runs into the hot water pipe at the mixer and cause warm water at the shower.

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