What causes my toilet to fill up with hot water instead of room temperature water? Is it bad for my toilet and does it cost extra money when it fills with hot water?
The main reason you may have hot water in your toilet is a bad flapper in the toilet tank or a bad fill valve. Either one of these can allow the water to seep into the tank. When you have a mixing valve on your toilet to prevent condensation, some hot water is introduced into the cold water line to warm the water just a little, but when the water just seeps a little at a time the hot water dominates the cold and you get a tank of hot water. It’s not bad for your toilet, but it could be hazardous to your wallet. Just like every other utility that uses hot water, the hot water being heating and leaking into the toilet takes gas and/or electricity and will run up your utility bill.
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