Why Does My Shower Go Cold When I Turn Another Tap On–What to Do?

When it is your relaxation time at the bath, the shower just starts releasing ice-cold water!  Nothing can be worse than this moment. 

I think you have faced the issue recently and come to us to find an easy solution. 

Why does my shower go cold when I turn another tap on? 

To fix this problem, firstly you have to know why the shower water gets cold. The unexpected flow reduction is one of the most common reasons behind shower water temperature problems.

Now, let us know the answer to your question: exactly why does my shower go cold when I turn another tap on? 

Why Does My Shower Go Cold When I Turn Another Tap On? Possible Reasons Why Does My Shower Go Cold When I Turn Another Tap On

There are several things responsible for such an issue.

The shower goes cold when you turn another tap on because it is interconnected to the water supply chain. Generally, A central water system supplies water to you, when another tap is open, it creates extra demand. So, the lately opened tap receives hot water, and the shower does not. However, another reason could be the water mixing valve inside of your shower.

Other possible reasons behind this issue are-

1. Accumulation of Mineral in the Tank

Most of our heating systems contain a tank for water storage. After a while of using the heater, minerals can accumulate in the tank. As a result, the water capacity gets decreased. So, the warm water runs out quickly, and your shower goes cold.

2. Pipelines are leaky

If you have old bathrooms, leakage in the water pipeline can be another cause for the shower receiving cold water. Due to the water leakage, the air gets confined inside the pipeline and cools the water.

3. Shower Valve doesn’t work

Although water valves getting damaged is not very common. But, after using it for a long time it could get degraded. To identify your issue, you have to check everything and if you don’t find anything wrong, there is probably a water valve leakage behind the wall. A damaged valve can’t mix cold and hot water properly to supply the showerhead.

4. The Thermostat is Tripped

A tripped thermostat can also cause the water heater to go wrong. If the thermostat seems to be faulty, you should check it thoroughly by below steps: 

Step 1: Check the shower water temperature. If it seems excessively hot, then the thermostat tripped. 

Step 2: Now, again set the thermostat and check. If it is still hot as before, then you will need to fix the old thermostat with a new one. If you don’t feel confident enough to fix it on your own, call the professionals. 

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5. The Circuit Breakers are Tripped

Circuit breakers cause the water heater and shower water temperature problems. Follow below checking processions to check tripped circuit breakers:  

Step 1: Reboot the heater by turning over the breaker’s backside. This way, the water temperature may change

Step 2: Check the shower again whether it is producing hot water. If you find that the circuit breakers are still tripping, you had better seek professional help. 

Also, you may love to purchase a water heater for the shower to keep your shower water hot. 

How To Keep Your Shower Warm? Easy Solution How To Keep Your Shower Warm

Most people experience temperature fluctuations once in their life. There are several techniques to deal with this issue. These tricks vary from simple to extreme. Getting the correct balance for your house is the solution.

1. Decrease Water Flow to Your Toilets

Usually, in toilets, people face the worst temperature fluctuations problem. Toilets only need a cold water supply to work.  When you flush the toilet, cold water refills the toilet tank. This cold water demand at the toilet steals the hot water flow and can lessen the hot water flow to the shower.  That is how you suddenly get an unpleasant fall of water temperature in the shower.

2. Utilize the Supply Valve

Closing the water supply valve in the toilet might be a useful solution to your water temperature variation issue.  Decreasing the water flow to the toilet can affect your toilet like:

  • Refilling the tank will create noise
  • The refilling process may be longer
  • You may still face some water temperature variations issue in your shower

3. Reduce the Water Amount of Your Toilet Using

In case you are wondering: why does the shower water get cold when you flush the toilet, this trick can be a solution. You can use this trick to lessen the water amount of toilet uses for all flush. It is a very useful trick, followed by many people for many years. You can put a brick, a small filled water bottle, or something else in the water tank. And it will consume space inside the tank and reduce the volume of water your toilet tank contains.

This process won’t solve your water flow problems but it will make the toilet tank take a short time to refill. Reducing the refill time decreases the impact on your water heater and shower.

Decreasing the water amount in the toilet tank can negatively affect the water flow to the toilet. The most notable effect may be trouble excluding solids from the toilet bowl because of the less water available for every flush. 

4. Keeping water at a constant temperature

Though your shower water temperature is supposed to be constant, it won’t happen every time. Particularly when any other tap is turned on. For example, while taking a shower if someone flushes the toilet, shower water will become cold. To get rid of this problem, the best thing you can do is; not turn on other taps.

If hot water becomes cold in the shower all the time, your mixing valve inside the shower might be a culprit. If the valve is broken or the seal inside it is damaged, the water temperature ranges in the shower. Initially, you could replace the sealing with a plumber putty. If the damage is really bad, you have to change the shower valve.

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Frequently Asked Questions:

  • How to test water temperature in the shower?

Checking water temperature in the shower is very simple to do. Just turn on the water of the shower for a minimum of three minutes to drain out cold water from the pipe. Now keep the water flowing and fill a bowl with water holding it under the showerhead. Fill the bowl enough as you can place an instant-read thermometer inside it. Now put the thermometer inside the bowl and record the temperature. 

  • Why does my shower suddenly go cold?

A broken water heater or a faulty shower valve may cause the shower to suddenly go cold. For both situations, you have to check these components manually and repair/replace them. If you got a new and active water heater, the valve in the shower might be faulty. Either the valve has leakage, or it is broken.

  • Why is my water getting cold so fast?

If the water heater doesn’t function accurately, water in the shower can go cold quickly. Especially, if trash accumulates in the water heater tank, it will take up space inside the tank. As a result, there won’t be enough space for a warm heater and the heater won’t provide hot water for longer. We recommend maintaining the water heater regularly by cleaning debris to get a constant supply of warm water.

Final Thoughts

After going through the article, now you know why the shower goes cold when someone turns on another tap in the house. 

Hope you won’t have to wonder again about the shower water fluctuation problem, as we tried to note down all details here. 

Fixing shower temperature fluctuation is not so difficult. By following proper guidelines, you can repair it all by yourself without any plumbing experience. It also saves you from plumbing costs.

But if the situation gets too troublesome to handle yourself, you should appoint a professional plumber. He can help you with what to do and how to fix the issue.

If you have any further related queries, please let us know. You can write your thoughts and questions about this article in the comment box below.

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