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Yeti_Chaser
Member since Nov 2017
3049 posts

Water pressure issues in shower

The shower closest to my water heater has low water pressure and the hot and cold water only work one at a time. It's either scorching or freezing. None of the other showers in the house have any issues. I was reading online about mixing valves but it sounds like those are only in single handle showers. This one has two handles for the hot and cold which are labeled backwards btw. What should I check first?



This post was edited on 1/11 at 8:52 pm


RichJ
LSU Fan
The land of the CoonAss
Member since Nov 2016
2238 posts

Maybe check the shower head inlet screen for trash/rust/scale, and clean out the shower head sprayers with torch tip cleaning tool. Screen could have trash impeding flow…


PSU2LSU
Penn State Fan
Baton Rouge LA
Member since Apr 2011
3057 posts

New showers heads have a water saving feature. Take it apart and get a needle nose pliers to remove it.


Unobtanium
LSU Fan
Baton Rouge
Member since Nov 2009
1098 posts

ETA - should have asked this first - new or ongoing problem?

If ongoing, the problem could be due to the way the shower valve and water heater are plumbed and their proximity to each other (as shown in pic #3).

My guess is that the pressure drop across the shower valves is fighting against the pressure drop across the (tankless?) water heater. Flow follows the path of least resistance.

Not sure how to fix this short of relocating the take-offs for your shower.
This post was edited on 1/12 at 10:39 am


idlewatcher
Houston Astros Fan
County Jail
Member since Jan 2012
60149 posts

Get some CLR and go to town on the showerhead.


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fatboydave
LSU Fan
Fat boy land
Member since Aug 2004
17235 posts

Check the cartridge. Same thing happened to me. Changing cartridge helped. The tube in water heater disintegrated and clogged the bathroom fixtures.


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TBoy
Notre Dame Fan
Kalamazoo
Member since Dec 2007
18397 posts

From what you describe, I would suspect the diverter valve.

This post was edited on 1/12 at 1:55 pm


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Yeti_Chaser
Member since Nov 2017
3049 posts

quote:

new or ongoing problem?

unknown, new house

quote:

tankless?)

yes

Thanks for all the suggestions. This will give me a good starting point for this weekend


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YeastExtract
Member since Jul 2021
43 posts

quote:

New showers heads have a water saving feature. Take it apart and get a needle nose pliers to remove it.


I had to do this when I moved in to a new place


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LazloHollyfeld
LSU Fan
Steam Tunnel at UNC-G
Member since Apr 2009
1073 posts

This. Tankless water heaters need to have enough water pulled through to keep them on. The water saver BS in new shower heads makes it so not enough water is being pulled from the water heater. To check if this is your problem, run the hot water in the bathroom sink while you shower. If that fixes the problem, it’s the stupid water saver. There are YouTube videos on how to remove.


Yeti_Chaser
Member since Nov 2017
3049 posts

quote:

To check if this is your problem, run the hot water in the bathroom sink while you shower.

Didn't work. Gonna try cleaning out the head and replacing the diverter valve


TBoy
Notre Dame Fan
Kalamazoo
Member since Dec 2007
18397 posts

Thanks for keeping us updated. Please let us know when you solve the mystery.


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