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Did I mean gate valve? It also gets called the by-pass valve. But it's not automatic. To be fair, the gate valve/by-pass valve in place is what's been in the property since I moved in 10 years ago. These people didn't put it in. Now, do I send the boyfriend up in the loft before or...

Yes, they are registered. I looked them up on the Gas Safe register along with their number. They came back yesterday and moved the pump back to it's original position in the airing cupboard. So I now have boiler, open vent, cold feed, pump. Then I think it goes to the 3 way valve & then...

I had a fully pumped open vented central heating system with a Glowworm 50FF conventional boiler and a separate hot water cylinder. Due to the flue incorrectly sloping back towards the boiler (which it wasn't meant to do with this conventional boiler), rain water had run through the boiler 3...