Hot water in the toilet tank can indicate a problem that needs to be fixed.
A few things can lead to a toilet filled with hot water, so take a little time to troubleshoot before you decide what to do next.
If you’re living in a new home, there’s a chance that hot water in the tank could mean the hot and cold water lines that run to the toilet were installed incorrectly. The plumber who installed your toilet to fix the problem.
If hot water in the toilet tank isn’t a problem from the get-go – meaning you’ve had a perfectly normal toilet until recently – chances are the problem is a malfunctioning flapper or a bad fill valve. In either of these cases, hot water can seep into the toilet tank.
Keep in mind lukewarm water in your tank is not the same as hot water. The mixing valve installed on toilets to prevent condensation causes water to be lukewarm. When there’s a problem, the water will be hot because too much hot is seeping into the toilet – there’s an imbalance.
Only a little hot water comes through the mixing valve during a regular flush. Still, a hot water leak will overpower the cold and steadily raise the temperature, so you eventually have a hot tank with a warm flush.
You might be able to fix the problem without calling a plumber if the problem is the flapper. Adjusting or replacing a flapper is pretty straightforward, but some people don’t want to bother with it. On the other hand, if the problem is the fill valve, you’ll need to call a plumber because it’s a more complicated repair.
Do I Need to Worry about a Toilet with Hot Water?
Hot water in and of itself will not damage the toilet. It might seem a little weird to have hot toilet water, but it doesn’t harm the plumbing or the toilet. However, the hot water indicates a problem you DO need to fix – a leak.
A hot toilet leak will consume hot water, forcing your water bill to skyrocket and your heating bill. Fixing it as soon as possible ensures you aren’t paying more for wasted water or wasted energy for your water heater to warm the water.