Just about to have me dinner and get a call out to no hot water, kiss the kids goodnight and look forlornly at my plate as I leave the house, customer has pleaded for it to be sorted tonight as it’s only on off peak immersion and they must have hot water in the morning. Arrive at the house and go through the standard what happened and they tell me they heard the tank boiling so turned it off and haven’t had hot water since. Thermostat fried so simple fix but during the conversation they told me when they turned it off ......................2013!!!!!!!!!!!!! And I lost my dinner for this ????