panel heater

Hello, I have a far infrared glass panel heater which is mounted on the wall. Over the last few days I have noticed it has started to become marked on the inside under the glass. What could this be? The unit isn’t wet or anything, still works and no smells. I’m a bit worried however that it’s...

I moved into a flat in May this year, can't figure out the heating and hot water system. I've tried the FAQ's and searching but can't find anyone posting a question in exactly the same scenario. The letting agent has been useless. The flat has a Dimplex RXPW4 pilot wire controller in the...