My fully qualified ex apprentice had to change a storage heater element last year, the customer had forgotten to turn it off the night before but to give the lad his due, he was game. He folded his dust sheet over loads of times, took out two hot bricks, changed the element and put the heater back together. He then noticed his dust sheet had a brown square on it, so did the cream 100% wool dining room carpet! That cost me a new bosch washing machine and tumble dryer to the owner of he carpet shop next to mine. It was still cheaper than claiming on insurance.
The lad offered to pay for it himself.......untill he knew how much it would cost.