Had a call out yesterday (saturday). New tenants moved in Friday, switched immersion and boiler on. That evening the landing was full of steam and water dripping off the ceiling, doorways etc. The neighbour had popped in and torn off some boxing in revealing the CWST which has been boiling. This is sat above the stairs on chipboard then on 3 steel bars - the heat of the water had flexed the tank, not so visible in the photos. No prizes for working out the cause....
Took ages to find the cold water feed to the cylinder, that too was expertly boxed in, almost invisibly. The box also houses the circ pump - a good find. Sadly I had already drained off the CWST and cylinder as it was leaking badly from the immersion.
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