Hot water in the toilet tank: How to deal with this problem?

A toilet tank is supposed to clean the human waste from the toilet bowl to the sewer system. This tank stores water for use to flush the toilet. But this tank is used to store normal room temperature water, not hot water. But when you flush warm water, you feel something is wrong with the tank system. The hot water in the toilet tank indicates the toilet fill valve or flapper is not working correctly. However, there are some other reasons behind this problem. To find the main issue with this, you need to know how the bathroom works.

How does a toilet work?

To find the main issue with the toilet, you need to know how this works. At first, a flushing system attaches with a flapper, so when you lift this, a rubber slab is typically used to seal the toilet bowl inlet. So when the water forces out, the float ball descends after opening the valve that refills the water tank again. A mixing valve often introduces a small amount of hot water in upgraded toilets when every tank is full. This is the reason to raise the heat of the water for a little bit. That also prevents sweating in the water tank.pouring hot water in toilet

Why is there hot water in the toilet tank?

At first, the problem with hot water is not for only a single reason. So before you fix the reason, scrutinize the issue. Then you take the next step and what to do next to solve the problem. If you move into a new home, there is a chance that hot and cold water means the two temperature water lines running the toilet are installed incorrectly. You need to call the plumber to fix the issue of who installed the bathroom.

After that, the hot water in the toilet tank isn’t a problem from the get-go, and you have a normal toilet until you notice the problem related to a malfunctioning flapper or any bad fill valve—that’s why you also get hot water in the toilet tank. Keep in mind that this is not a problem if you get lukewarm water in the toilet. But if you get hot water, then the mixing valve is installed in the bathroom that prevents the cause of lukewarm water; when the water is hot, too much hot seeping into the toilet’s water tank creates this imbalance.

If the hot water leaks, it overpowers the cold water for a little bit when little water leaks from the valve. So it causes the hot water into the tank with a warm flush.

How to fix this issue?

If you don’t know how toilets work, don’t try to fix the issue by yourself. Just call the plumber to solve this issue. Otherwise, you end up with another problem. 

The hot water mainly results from the disturbance of the visceral level, but you get used to it after a while. This heat doesn’t damage your toilet, and you can easily use this regularly. So the hot water is not a problem, but why this is happening is the main thing to consider. Because if it happens continuously, then your water and heating bills rise for the leak in the toilet.

Finding the leakage of the flapper is not easy work. And plugging the gap is more complex than that. So instead of repairing this thing, replacement is an easy and safe option for you. This is a little bit expensive but saves some time.

Final Thought

The hot water problem does not create a big issue with using the flushing toilet daily. But the reason behind this problem may not be a good sign for the future. You can use the bathroom as usual, which doesn’t mean you won’t repair this issue. So if you can, solve this issue as soon as possible.

More Fixes: The toilet bowl is empty, but the toilet tank is full: How to fix it?

Hi, this is Robert Crossan, the owner of this website, has 17 years of experience in the installation, maintenance, and repair of toilets and plumbing systems. After completing the Level 2 Basic Plumbing course in 2005, I started working in both domestic and commercial buildings as a professional plumber. So I can figure out the core difference between different toilet models and brands. It also helped me monitor their work performance and setbacks.

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