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  1. KOHLER
  2. Toilets and Seats
  3. Troubleshooting

Condensation on the Outside of a Toilet Tank

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Condensation on the outside of a toilet tank is the result of humid air in the room coming in contact with the cold tank. Similar to what happens on a glass filled with a cold drink. Condensation on a toilet tank is most often a problem in the summer time in humid climates, but can also be a problem in the winter. In addition, houses on well water suffer a great deal from this problem. Houses built in the 70's are more air-tight and energy efficient, consequently humidity is easily trapped indoors.

KOHLER offers several two-piece toilets fitted with an Insuliner® tank liner. The factory-installed tank liner minimizes condensation on the outside of the tank when exposed to high humidity. The Insuliner® tank liner is not available on one-piece toilets.  Visit us.kohler.com for more information.

Causes and solutions for condensation on toilet tanks:

  • Condensation may mask a leaking toilet. A constant exchange of fresh cold water in the tank will cause condensation to form on the outside of the tank when the humidity is high in the bathroom. Check the toilet for leaks.
  • Is there enough ventilation in the bathroom? An exhaust fan in the bathroom may be needed.
  • In the winter, the condensation may be caused by using a humidifier on your heating system. If this is the case, adjust the humidifier.
  • Position a drip tray under the tank. One type has sponges that absorb the condensation and another type has a tube that drains accumulated condensation into a container that sits on the floor under the toilet.  KOHLER does not offer drip trays. Check local hardware stores or online retailers.
  • Install a toilet tank liner kit to the inside of the tank liner. Follow the directions carefully regarding cementing the foam to a clean, dry surface. The foam may loosen after a few years. Check local hardware stores or online retailers for the kit. 

 

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