The toilet mixing valve is a part of your toilet that you probably don’t spend a lot of time thinking about. In fact, you may not have even known that such a thing existed or what it does. And that is fine because the mixing valve for the toilet is not something that you really need to spend a lot of time thinking about in this all-to-busy life. However, if the water in your toilet is hot, it is probably time to get to know the toilet mixing valve.
What the toilet mixing valve does is pretty simple and basically self explanatory. The toilet mixing valve mixes hot and cold water together to achieve a desirable water temperature for your toilet tank. The reason why you want to mix hot and cold water is to eliminate toilet condensation (sweat) from appearing on the side of your tank. It may not seem like a major issue but toilet condensation can become a real headache if not properly addressed.
One of the biggest issues with the toilet mixing valve malfunctioning actually has very little to do with the toilet mixing valve itself. If the toilet flapper is not creating a proper seal or the fill valve is not completely closing, a small and steady supply of water will continually fill your toilet tank. This is not only wasteful but, because of the small supply of water, it will generally pull from the warm water supply instead of the cold water supply. This is something of a double whammy of wasting water and energy.
If repairing your toilet flapper or fill valve does not fix your toilet water temperature, call a licensed plumber to diagnose the problem. Some toilet mixing valves are located outside of the toilet tank and can be difficult to work with if you do not understand what you are doing.