condensation on cistern

you need to warm the room up,

 

Mines the same, no rad in my toilet.

 

What Phil!! You have a bendy wet pipe.

 

You could look at why there is so much moisture in the air couldn't you. Ventilation? Do you dry washing on your radiators? Etc. It's basic physics, warm air can hold a lot more moisture that cold air so when the warm moist air hits a cold surface the moisture condenses out. The end. If you aren't able to ventilate then you could look at a dehumidifier.

 

A common enough problem during the cold weather. Even if you warm the room up, every time you flush the cistern there's freezing cold water filling it up, so that's going to cause some condensation until it warms up a bit. There are some double walled cisterns out there that tend to negate this age old problem. Ventilating the bathroom will help, but during cold weather, who wants windows left open?

 

Perhaps it's time to warm the room LESS!

Mr. HandyAndy - Really

 

Ventilation is more effective than heating the air. When you heat the air, it holds more moisture - all that lovely sweat and hot breath from you peeps (as well as cooking, washing, showering, etc.)

That warm moist air then hits a very cold spot - the cistern. Condensation.

That's not to say you should make that room cold - that won't help at all, 'cos the warm moist air from the rest of the house will still go in there and condense even more...

During the day, I'd recommend leaving the bathroom window on the 'vent' setting and also leave the loo door open. That will help. Once you're home, I guess you'll want to close all the windows, so just warm the whole house evenly, and try to avoid creating excess moisture. When cooking, use the extractor hood. When bathing/showering, absolutely use the extractor and keep it running for a good 5 minutes after you've finished.

Don't dry clothes on horses or rads - at least not a full load at a time.

But, you will always get some condensation forming on these cold surfaces...