Install an antisweat valve in the water-supply line leading to the toilet. An anti-sweat valve adds a little hot water to the toilet water line, which raises the water temperature in the toilet enough to warm up the tank and bowl. That’s all it takes to keep condensation from forming, even in the most sultry weather.
Why does my toilet look like it’s sweating?
This is why most toilets sweat in the spring and summer (just like us); the cold water in your toilet tank causes the surface of the tank to cool down. When this cold surface comes in contact with the warm, humid air in your bathroom, condensation – or “sweat” – forms.
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