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Blown fuses were the root of the problem that meant the stat needed replacing in the first place. We were using the immersion heater a lot in the summer to try and save on Gas bills - then the fuse blew. The vibe I'm getting is that I shouldn't be using it, someone put my mind at rest...

Thanks for the advice on the electrics and the vent. I've had a closer look, the pipe which comes out of the top of the tank branches into two pipes about half way down at the back. One goes right and is the same width as the pipe out of the top, one goes left and is thinner in...

This seems to be degenerating, but thanks for those replies which have been informative. So I'm gathering that; 1) the thing on the right isn't a vent? 2) I should leave both switches OFF and it won't impair my hot water supply when using the central heating to heat it 3) The whole...

I guess what I'm trying to get to the bottom of the setup as I'm unfamiliar with it. My basic quesiton is, in your opinion Should I leave the bottom switch on or off? If I leave the bottom switch ON will my immersion heater be running 24/7 and costing me a fortune? Its a switch...

Thanks for the replies so far, You're right, both switches are currently off, which is how the sparky left them when he finished. I've got a full Gas powered boiler & central heating system which is how we normally heat the water. Given that method of heating the water, does it matter...

Thanks Guys The guy who changed the internal stat was a qualified sparky but only had instructions to 'replace the faulty stat' hence why he's left it as is I presume. So should I leave that lower switch on, or off as it is in the pic? Does it being off make a difference to my hot water...

Hi - I'd appreciate some expert advice please. I've recently had the stat changed on my hot water tank. Upon looking at the tank, I've noticed that there are TWO switches on the wall. They were both there before the work was carried out, I just never noticed: the top one...