Working in an office block today; "our water heater doesn't work, could you have a look".
One of those instant 'make a cup of tea' things that delivers boiling water. Heatrae Sadia Supreme 140 - holds 2.5 litres of water.
Very helpful. Explained the situation to the guy on the phone. "Its scaled up" he said. Told me to take the top off the tank & remove the scale.
Never seen anything like it before, sheets of the stuff coming off.
Didn't realise until now they are around £570! Worth the repair cost.