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Old 11-29-2016, 07:34 PM   #1
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Basic Plumbing Question


My shower gets cold when someone flushes any toilet in the house or when someone is using the washer (cold wash). Why is this?

Shouldn't the shower gets hot if there's a demand for cold water elsewhere?
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Old 11-29-2016, 08:10 PM   #2
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Re: Basic Plumbing Question


If you have a pressure balancing valve on the shower the balancing spool is apparently malfunctioning. When it is working correctly you should only get 2 degree swing. Yours is going full cold.
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Old 11-29-2016, 08:19 PM   #3
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Re: Basic Plumbing Question


That's a very good question. Exactly; You would think the shower would get hotter. There are a couple things that come into play. I'm sure someone will come along and explain it.

Found a little article to read until some plumbers respond.

http://lifehacker.com/why-the-shower...-how-508252782
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Old 11-29-2016, 09:33 PM   #4
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Re: Basic Plumbing Question


The article doesn't explain why it would get colder in the shower; it only explains why the shower would get hotter.

The shower in question is quite new (installed maybe 5 years ago max). I'll check to see if I can gather the make and model through the trap door and post it here to see if it has one of those valves you're talking about.

Assuming it does, does this definitily means its malfunctionning?
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Old 11-29-2016, 10:12 PM   #5
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Re: Basic Plumbing Question


Do you by any chance have a re circulation line on your water heater?
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Old 11-30-2016, 12:03 PM   #6
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Re: Basic Plumbing Question


Quote:
Originally Posted by hkstroud View Post
Do you by any chance have a re circulation line on your water heater?

No, I do not.
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Old 11-30-2016, 05:12 PM   #7
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Re: Basic Plumbing Question


Quote:
Originally Posted by Solidify View Post
The article doesn't explain why it would get colder in the shower; it only explains why the shower would get hotter.

The shower in question is quite new (installed maybe 5 years ago max). I'll check to see if I can gather the make and model through the trap door and post it here to see if it has one of those valves you're talking about.

Assuming it does, does this definitily means its malfunctionning?
Yea it means you need a new cartridge.
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Old 11-30-2016, 10:46 PM   #8
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Re: Basic Plumbing Question


When I remove the existing cartridge, how can I confirm it's the culprit? Will there be any obvious indications? This is a single lever shower handle.
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Old 12-01-2016, 05:33 PM   #9
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Re: Basic Plumbing Question


Nope is it a name brand Delta or moen the cartridge is free. Call the warranty line.
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Old 12-01-2016, 06:25 PM   #10
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Re: Basic Plumbing Question


I'll do the work this weekend when I have some time. Just before however, if replacing the cartridge doesn't prove to correct the issue, what else can I look out then, since I'll have time...
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Old 12-01-2016, 08:07 PM   #11
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Re: Basic Plumbing Question


I will be curious to see if the new cartridge cures the problem. In a previous house we experienced the same, but it occurred without a balancing type shower valve. We dealt with it by not running water when someone else was in the shower.
The plumbing was your basic copper branch line plumbing.

Current house has pex plumbing with a manifold set up. Seems to work much better. No pressure drops or temp changes at the shower head, irregardless of any other usage.
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Old 12-02-2016, 08:49 PM   #12
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Re: Basic Plumbing Question


It's either the pressure balancing spool or bleed over from one of your single handle faucets. Moen cartridges sometimes go bad in a way that allows cold to cross over to the hot in the cartridge itself. So that can be eliminated by shutting off the cold under all your lavatory faucets and seeing if the problem is eliminated. If you have Moen faucets.
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Old 12-03-2016, 08:42 AM   #13
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Re: Basic Plumbing Question


Basic Plumbing Question-imageuploadedbydiy-chat1480776137.493715.jpg
Basic Plumbing Question-imageuploadedbydiy-chat1480776153.959242.jpg
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Old 12-03-2016, 08:45 AM   #14
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Re: Basic Plumbing Question


Basic Plumbing Question-imageuploadedbydiy-chat1480776302.299931.jpg
Basic Plumbing Question-imageuploadedbydiy-chat1480776312.912768.jpg
Basic Plumbing Question-imageuploadedbydiy-chat1480776322.581199.jpg
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Old 12-03-2016, 08:46 AM   #15
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Re: Basic Plumbing Question


It's a Danze make faucet.
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