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Why Does My Shower Lose Hot Water When Someone Turns On A Tap?

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When you turn on the shower taps you are expecting hot water to come out of the showerhead. Nothing is more frustrating than waiting a long time for a shower to heat up or trying to have a relaxing hot shower and suddenly being hit by cold water.

There are many different working parts of a shower including the drain, faucet, taps and pipelines. The water pipes and fixtures in your property are all connected. Sometimes when someone uses another tap in your kitchen or laundry or even flushes the toilet, you may experience loss of heating to your shower.

Why Does My Shower Lose Hot Water When Someone Turns On A Tap? Photo

This is due to the water supply from the hot water tank and the water pipes working together at the same time.

It is important to know how your plumbing system works. Pipes carry water through different channels that all originate from one big pipe. This is connected to the hot water heater and other branches of pipes that go to various other fixtures such as taps, toilets and sinks.

Water is continuously being pumped around the property simultaneously. When you turn on your hot water tap in the kitchen, whilst the shower is running, the flow of hot water to the showerhead is interrupted and given to the pipe leading to that tap. That is why you have a sudden burst of cold water, as the hot water line is being used. This works in reverse also.

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How Do You Keep Water Hot When Someone Turns On A Tap?

To preserve heat and pressure when you are having a shower, there are a few adjustments you can make with your plumbing system in the house.

Water Efficient Taps

You can install a water-efficient tap set in your bathroom. The function of the water-efficient tap is to slow down the speed of water travelling through your household pipes.

You may not want to replace the taps in your shower, so you can just have an aerator fitted instead. An aerator is an attachment on the tip of the tap head. It works by adding air to the water stream which limits the water flow through the faucet.

Water-Saving Showerhead

A water-saving showerhead works similar to a water-efficient faucet system. It reduces the pressure of water through air bubbles. It is attached to the top of the showerhead and can be removed when needed.

Water-saving showerheads and faucets are an ideal plumbing solution and they are relatively easy to achieve in your home. The combination of regulated water pressure, which helps to maintain running water temperature as well as looking after the environment and your wallet, might be the most viable solution.

Correct Pipework

A plumbing problem such as inconsistent hot and cold water temperatures can be due to pipework that is incorrectly installed or the sizing may be insufficient for the supply and demand. The size and condition of piping can be checked by a licenced plumber.

Only Use One Fixture At A Time 

The easiest and most cost-effective way of ensuring you don't lose hot water when you are using the shower is to refrain from using more than one faucet or toilet at the same time.

It may sound simple enough but it is the most effective method to prevent heat from escaping a fixture, such as a showerhead.

Why Does My Shower Lose Hot Water?

There will come a time where you are going to encounter a problem with your water temperature. Whether it is when you are cooking in the kitchen or washing up in the bathroom. It is a common issue that can be easily repaired.

The cause might not be down to one reason alone. It may be a combination of various factors. Troubleshooting the problem will be the first step in getting your flow of water running in your home efficiently.

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No Hot Water In Your Shower

If you are getting hot water to every fixture except for your showerhead, the issue may lie in the shower itself. You will need to check the shower valve or fix a worn-out washer or O-ring. The cartridge could possibly be broken and these valves will need to be replaced.

The problem could also be further down in the line. Inspect the pipework to ensure there is not a leak or possible corrosion.

No Hot Water Throughout The Property

If you are experiencing a loss of heated water throughout your whole house, it is worth inspecting the hot water tank. Depending on the condition and the age of the unit, you could need a replacement.

The type and size of the water heater you currently have may not be keeping up with the demand for the number of showers being taken. Check the piping and valve on the tank as there may be a leak to fix.

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The 8 Causes (And Fixes) Of Low Hot Water Pressure

Below are some different common reasons why you are experiencing a drop in water pressure. From finding the source, you can determine the appropriate steps in finding the best solution for your flow of water and heating issue.


A tempering valve is a safety mechanism to stop water from heating too much where it can cause severe burns. It regulates the temperature to a safe level. With all valves, they need to be replaced over a period of time to prevent accidents. A plumber will help to inspect the condition of the tempering valve and replace it with a new one.


Blocked and cracked pipes are a big cause of low water pressure. Many items and materials can get lodged in between the hot and cold pipes creating a barrier against water. A pipe and drain specialist can unclog the pipe system and repair pipes that are corroded or blocked.


A hot water system may have a filter that can get clogged with debris. These filters are found on the inlet and outlet valve. The water pressure would be affected if the filter is not regularly cleaned. Just like with any filter found around your home, regular cleaning is required to ensure there are no blockages.


Leaks can cause major issues in household plumbing systems. If you are experiencing a leak in your hot water system, you will need to contact a plumber to get the correct part repaired or replaced. You may also encounter a leak in one of your pipes, which may be preventing high-pressure hot water to flow through. It is important to determine where the leak is coming from so it can be fixed correctly.

Shower Head And Taps

Low pressure with hot water may be isolated to one fixture like a bathroom tap or showerhead. It is recommended to open the fixture and replace any worn-out washers or O-rings. You should clean the showerhead of any built-up debris. Older style taps could have a water-saving device attached to them however, you can remove that to increase the water pressure.

Sediment Inside Hot Water Tank

Over time, minerals and sediment can build up inside your water heating system. The longer you leave the unit in this condition, the worse the build-up is. Too much Sediment and debris can create blockages and corrode the pipework and valves. A licensed plumbing team can flush out and service your water heater. A good internal clean will extend the life of the unit.


Correct installation of a water heater is crucial in the performance of the hot water supply. A licenced and experienced plumbing team will be able to install your hot water tank correctly and safely. If the piping and valves are not installed and connected correctly, the tank will not work. A professional water heater plumber will use the right tools and material and inspect the unit to ensure it is running perfectly.

Hot Water Tank

Your water heater is the heart of your hot water in your household. It dictates the pressure and temperature coming to your fixtures. The tank does have a lifespan of around 10 years and once it reaches that time, you may want to start looking at a new system. A plumber will help you in finding the best tank for your needs. Whether you are wanting a gas or electric run unit. Finding the perfect size and type of tank will make the difference in providing hot water in your household.

Alternatively, if the unit is relatively new but is leaking or not performing at its best, repair works can be made to prolong its shelf life. A professional will know what will work.

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Hot baths reduce inflammation, improve glucose metabolism

Call A Plumber

To determine the cause of low water pressure and issues with temperature, it is recommended that you contact a reputable plumbing company. The plumbing system in your home needs the right care and attention that only an experienced team can provide.

With the correct inspection, your water system problem will be sorted out and you can run cold water in the home without interrupting showers. Let the experienced professionals take care of it so you can have your hot water running in no time!

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