Shower temp starting to fluctuate

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Old 05-31-17, 06:06 AM
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Shower temp starting to fluctuate

I have lived in this for 25 years, and repiped it with copper soon after I moved in. I have never had a problem with the kitchen sink affecting the shower pressure/temp until about 4 months ago. Can anyone think of a reason, other than city water pressure changing, which we have not noticed any change in pressure in any faucets around the house?
40 gallon water heater is about 3 years old, and seems to be working fine.
 
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Old 06-01-17, 04:14 PM
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I would get a pressure tester. They connect to the hose bib & read the pressure. Connect it there, turn on the shower then the sink watch the gauge. If the pressure isn't dropping, my guess is that it would have to do with the hot water heater. Test it with cold & hot separately.
 
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Old 06-01-17, 07:31 PM
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Does your shower have an anti-scald valve ?
Those type valves use pressure and temperature sensitive parts to eliminate scalding.
 
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Old 06-02-17, 06:44 AM
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Does your shower have an anti-scald valve ?
Even if it has an anti scald valve, why would it start to work 4 months ago?
 
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Old 06-02-17, 08:21 AM
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Exactly, donoli2016. Nothing has been changed. Could a wearing out washer in one of the supply faucets cause this? No drips, but Cold side feels slightly different.
 
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Old 06-02-17, 08:39 AM
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What about my pressure tester suggestion in post #2?
 
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Old 06-02-17, 08:43 AM
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donoli2016,
Haven't looked into that yet. Water pressure/volume seems to be normal at all faucets, but obviously something has changed. What could be going on with the water heater? It's fairly new.
 
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Old 06-02-17, 04:33 PM
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What water heater do you have? Have you googled it, for problems?
 
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Old 06-02-17, 04:36 PM
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I am at a loss.... I know it happened four months ago.... do you feel that the anti scald valve is definitely NOT the cause of any of your problems ?
 
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Old 06-03-17, 06:29 AM
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Water heater

My water heater is a Rheem PROG38-38U RH60, 38 gallon, installed in 2014. Thermostat is set to 130'. As far as I can see, there is no anti-scald valve.
 
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Old 06-03-17, 06:44 AM
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We have a Symmons Temptrol Anti-Scald Valve/Faucet in our shower, which serves to keep the balance or proportions of hot and cold water exactly the same . . . . even if the water pressure varies.

It works fine EXCEPT when it gets a build up of mineral deposits in it which gums up the free movement of the proportional balancing valve, so that we'll begin to experience a change in the shower temperature when someone begins to draw hot water elsewhere in the house (makes it cold) or draws cold water elsewhere in the house (makes it hot).

The result is that I then know it's time to disassemble the Temptrol and soak it in vinegar for a couple days to dissolve the mineral deposits. I now have two of the Temptrol internals (valve spindle) so that our shower isn't put out of commission for days while I perform this function.

Maybe you have something similar going on ?
 
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Old 06-03-17, 06:54 AM
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My plumbing does not have anti-scald valve.
 
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Old 06-03-17, 08:07 AM
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Originally Posted by Robs10
". . . My plumbing does not have anti-scald valve . . ."
Then do you have separate controls for the hot and cold water in the shower, or is it still some form of single-handle mixing faucet ?
 
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Old 06-03-17, 08:46 AM
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Yes, separate faucets for Hot and Cold.
 
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Old 06-03-17, 09:12 AM
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I googled that heater for problems, no results. I still say that you should make the pressure tests that I mentioned before.
 
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Old 06-03-17, 09:31 AM
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I haven't noticed any change in line pressure, and have lots of pressure at all my faucets. Yesterday, I pulled the flow restrictor out of the showerhead, and pressure is now very good, just that the temp drops when the kitchen sink is used, a relatively new phenomenon. Nothing has changed in my house plumbing. Could it be a faucet washer issue? They are a PITA to open up, so not inclined to if I don't have to
 
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Old 06-03-17, 04:33 PM
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The temperature drop is normal. The only strange thing that makes your situation different is that it just started to happen 4 months ago. It's clear that you don't want to buy a pressure tester but I still think that it's a good idea.
 
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