Why Your Toilet Sweats and How You Can Stop It

Why Your Toilet Sweats and How You Can Stop It


You may have noticed on occasion, water droplets on and around your toilet, and wondered what caused it. This is what is referred to as toilet sweating. It’s a damp, drippy, and all-too-common problem caused by fluctuation in humidity inside the bathroom. This dampness can be disturbing, especially on bathroom trips at night or during winter seasons. Did you know there are remedies for this? We will address how it happens and share solutions for eliminating it altogether.

Why Your Toilet Sweats

The main reason your toilet sweats is because the water that is coming into the tank is colder than the bathroom temperature. The difference in temperature causes humidity, which condensates the water and forms droplets on surfaces. These droplets settle on various parts of the toilet to give the impression of sweat. The good news is that toilet sweat is not a plumbing problem. However, when this process occurs for a prolonged period, the sweat can drip and accumulate on the toilet floor. It can cause floor damage in the long run.

 How to Stop Your Toilet from Sweating


  1. Turn on the fan in the bathroom to eliminate most of the sweat

A fan will draw in dry air from outside the bathroom, and exhaust the moisture from the bathroom, breaking the condensation cycle. Invest in a ventilation fan that can be fitted close to the bathroom window and this will solve your condensation problem. As a bonus, the ventilation fan will draw out stale air, improving the quality of air inside the bathroom.

  1. Wipe off the moisture in the bathroom after the shower

Hot showers tend to leave warm moisture droplets on the bathroom walls, contributing to humid temperatures after the shower. Since this contributes to toilet sweating, you should consider wiping down the moisture. This can be done with the help of a towel or dry sponge. Another approach that can work similarly, is opening the bathroom windows if the weather permits.

  1. Drain the tank, dry it out, and then insulate it

A more permanent solution to toilet sweating is to insulate the toilet water tank. This will help prevent the air/water temperature reaction of condensation. The process involves draining the tank, drying it, and wrapping the inside with a favorable insulator. There are various Anti-Condensation Liners that can be used to insulate the toilet. It’s an easy DIY project that can be done within minutes.

  1. Tempering water in the mainline

This is a more advanced and professional solution to reducing indoor condensation. Tempering water is a technique used to ensure that water flowing to the house is never too cold, by raising the water temperature. Eventually, water reaching the toilet tank will match the room temperature, so condensation won’t occur. This technique is highly recommended, especially in areas highly prone to cold weather.

  1. Have an anti-sweat valve installed

The anti-sweat valve concept is similar to the tempering technique, but more focused on the toilet tank. It works where hot water is redirected to the line, by using a special valve installed by a plumber. When installed, the cold water flowing to the tank will be warmed by the hot water, preventing condensation occurrences. It’s a great alternative to maintain a dry external toilet.


Sweating toilets can be a thing of the past by implementing these tips. Kalka Plumbing Heating & Air is here to help with all your plumbing and air conditioning needs.


Kalka Plumbing Heating & Air, located in Irvine and servicing all Orange County residents and businesses, for plumbing, heating, and air conditioning needs.

At Kalka Plumbing, Heating, and Air, our goal is to offer the most reasonably priced plumbing and HVAC work in Orange County and the surrounding cities. Because we value our customers, we do everything we can to keep service costs down without skimping on quality. We also pride ourselves on serving our customers for almost 3 decades!.

 Find us online or by phone – (949) 458-6600