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Glam Journal

What causes shower temperature to fluctuate?

Author

Matthew Shields

Updated on April 06, 2026

What causes shower temperature to fluctuate?

If your water temperature fluctuates, the pressure-balancing valve might be to blame. Your pressure-balancing valves open and close depending on your water flow in your plumbing system. This drop in pressure sends scalding hot or freezing cold water to your shower head.

What happens if shower is too hot?

Hot showers and baths can inflame the skin, causing redness, itching, and even peeling — similar to a sunburn — and can disrupt the skin’s natural balance of moisture, robbing you of the natural oils, fats, and proteins that keep skin healthy.

What happens when the temperature of the shower goes up?

Unpredictable water temperature fluctuations can cause personal injury. Scalding hot water can destroy lipid layers of your skin. Young children can get severe burns if there’s an unexpected hot water surge out of your shower head.

Is the hot water heater in my shower too hot?

This temperature is warm enough to stem the growth of bacteria in the hot water heater, and also warm enough to reach a perfect hot temperature in your shower. In homes with young children or elderly occupants, 120 degrees may be too hot.

Is there a way to regulate the water temp in a shower?

While there are water temperature regulators installed on your water heater, many modern showers also come complete with an anti-scald ring. This is another layer of defense designed to ensure you don’t suffer accidental burns when showering. These devices work by regulating the maximum hot water to cold water mixture in your faucet.

Why does my toilet water get cold when I Turn on the shower?

If a nearby toilet starts to draw cold water, increasing the risk of scalding, the pressure-balancing valve responds by simultaneously regulating the hot water input, thus maintaining the cold and hot water balance that is delivering your desired water temperature.

Why does the water temp in my shower fluctuate?

The most obvious cause of fluctuating water temperatures, according to Abrams, is simply “running low on hot water from the water heater.” He says, “This happens if you’re last in line for a shower at your house, or if you have an undersized water heater.

This temperature is warm enough to stem the growth of bacteria in the hot water heater, and also warm enough to reach a perfect hot temperature in your shower. In homes with young children or elderly occupants, 120 degrees may be too hot.

What should the temperature of my shower be?

For example, if your water heater produces water that is 140 degrees F, you can set your shower temperature to never hit above 105 degrees F. This keeps you and other guests safe from scalding temperatures. Complete control over water flow. With a control dedicated to water flow,…

Why does my shower get hot and cold at the same time?

Inadequate heater size: For example, when a toilet flushes, it will pull cold water to fill up the tank. This can often cause a shower to become suddenly hot. On the other hand, if a dishwasher begins cycling to use hot water, it can cause a shower to become cold.