7 Ways to Fix a Sweating Toilet

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condensation on bottle

What’s cold on the inside, warm on the outside and sweating bullets all over the bathroom floor? You guessed it: a sweating toilet tank. A toilet repair plumber can help you. But before you call a professional, consider your options for a DIY repair. Some fixes are easy and cheap.

A sweaty toilet is caused by condensation.
Moisture condenses on cold bottles when the exterior air is warmer than the interior liquid. The same thing happens when a toilet tank sweats.

What Causes a Toilet to Sweat?

Condensation or sweat forms on the outside of a toilet when the tank is cooler than the surrounding air. When a toilet tank fills with cold water, the outside of the tank cools down or drops in temperature. When the warm air in your home makes contact with the cold tank, sweat or condensation can form on the outside of your tank.

To get technical. Water entering the tank is generally between 50-60 degrees Fahrenheit. Your home may be 10-20 degrees warmer than that. Moisture in the surrounding air condenses and collects on the outside of the toilet. It’s the same phenomenon that causes water to form on a glass holding a cold beverage.

How to Fix a sweating toilet?

When left untreated, a sweating toilet can cause water damage on the floor. You’ll definitely want to take care of this problem.

There are a number of ways to take care of a toilet that sweats too much. Here’s how to stop a toilet from sweating:

1. Get a mixing valve: An anti-sweat valve is an antiperspirant for your toilet. The valve lets a little bit of hot water mix with the cold. This repair will nearly always work, but if you don’t have easy access to the hot water line, it can be a rather involved project. Hiring a toilet repair plumber may be the best option if you plan to install a mixing valve.

2. Install a new toilet: Sometimes it makes more sense to replace than repair. A low-flow toilet uses less water, which means the tank will have less of the stuff that makes it cold and clammy. Models with built-in installation are available.

3. Replace the tank: You may be able to replace only the tank on your toilet. Choose a tank with insulation.

4. Keep the tank warmer: Buy and install a kit to insulate the tank.

5. Repair a running toilet: If the toilet is running, it’s more likely to sweat because it’s continually refilling with cool water.

6. Reduce humidity: Install and use a bathroom fan, take shorter showers or leave the bathroom door open. Crank up the AC while the showers in use.

7. Get a drip pan: Place a tray under the tank as a stopgap until you can work a more elegant repair.

Water running down the toilet tank isn’t really a leak, but it’s still a nuisance. To troubleshoot a leaking toilet, read our blog post on that topic.

Hire an Experienced Vancouver Toilet Repair Plumber

At Simpson Plumbing, we repair all kinds of toilets with all kinds of problems. Searching for an experienced professional plumber in Vancouver WA and beyond? Give us a call at (360) 834-5311. We’ll find a way to fix your toilet!

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