Hastings, Nebraska

Why Flushing a Toilet Makes Your Shower Water Hotter February 11, 2019

Hastings, Adams
Why Flushing a Toilet Makes Your Shower Water Hotter, Hastings, Nebraska

If you have ever been in the shower while someone in your household flushed a toilet, you may have experienced the shock of a sudden temperature increase. It usually lasts only a few seconds, but it can be uncomfortable and startling. Below, you'll find an explanation for this plumbing phenomenon and a solution to the problem.

Why Does Your Shower Blast Hot Water After a Toilet Flushes?

To achieve a comfortable shower temperature, you must adjust the faucet to mix appropriate amounts of cold water and hot water from your heater tank. The plumbing lines feeding your shower often feature a main "trunk" line from each source—hot and cold—as well as smaller "branch" pipes that lead to different rooms in the house.

PlumbingWhen someone flushes a toilet, cold water is diverted down a separate branch pipe, leaving less available to feed your shower. The reduced flow of cold water upsets the delicate temperature mix and causes a sudden blast of hotter-than-normal spray.

What Can You Do About It?

To address the sudden temperature fluctuation, you can have a plumbing professional install a thermostatic mixing valve. This simple device senses a reduction in the amount of available cold water and adjusts the flow of hot water equally to maintain a constant temperature. While you may notice a slight decrease in water pressure, this is only temporary and usually much preferred to the alternative.


To hire a reliable, experienced plumber at affordable rates, contact Furrow Plumbing in Hastings, NE. They specialize in both residential and commercial plumbing as well as sewer and drain cleaning. They've been serving clients in and around Adams County for more than 30 years and have developed a reputation for excellent workmanship and superior customer service. Visit their website to message them online or call (402) 469-7071 to schedule a consultation.

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