We have lived in this house for almost 32 years. The heating consisted of 4 large night-storage radiators, which, even then, looked like older models.
About 20 years ago, I discovered that one of our radiators was cold...I had a look at it, expecting to see a break in the element but couldn't see a fault. There was a phone number on it, so just out of curiosity, I phoned them
I explained to the lady, giving the model number. She said that they were quite an old model, but spare parts were still available. She also asked, had I checked that the 'cut-out' (safety button) had been deployed...
I pressed a component that could be a button and I heard a 'click'...
It's been working fine ever since and the other three are all O.K.
They must be about 40 years old by now....
My wife wants me to change them for modern ones.....
Malc.