Our water heater thingy packed up today. Or rather, it was boiling away, filling the cupboard with steam and splashed water and the top tank lid was bouncing around. My guess is a broken thermostat or something.
Anyway, I turned it all off and called a plumber, who will arrive tomorrow sometime.
In the mean time, no hot water 
At least my heating isn’t dependent on it 
Update: Plumber arrived, replaced several bits, cleaned up mess and then charged me £WTFOMG!
At least it’s working again.
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Ouch – I suspect that probably cost you a bit in electric