Re: hmm
fail to understand the devastation that it can cause
We've had years of the (usually very reliable) central heating/hot water controllers blowing. I think I've replaced them about 5 times in the 20+ years we've been there.
Two years back, we had an extra spur added to power an outside all-weater double socket (on its own RCD and a switch) which involved having the fuse box replaced as the original 1997-vintage one was no longer compliant with the electrical codes.
The sparky went slightly pale when he took the lid off the box.. Apparently, the original person that had fitted it hadn't been particularly scrupulous about how well they linked to wires to the fuse box and at least one of the bare cable-ends wasn't securely fastened into the back of the fuse.
We haven't had any electrical oddities since.
(Unlike the water - you can't use the main bathroom hand taps at the same time as our en-suite taps otherwise all the happens in the en-suite is that no water comes out and air gets sucked into the pipework, creating a bubble that blocks any more water coming out.. The only way to get rid of the bubble is to put your hand over the mixer outflow and turn both taps on. After a while, you'll hear loud bubbling from the header tank and the bubbles are forced out by the hot water going the wrong way up the cold water pipes. At which point, everything starts working again).