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15mm pipe between the two !!

Is there a 'dead leg' between the pump and your shower?

Being encased I would guess they are blow-off pipes. One 15mm from your boiler, one 22mm from your unvented cylinder?

Sometimes you can get away with just cleaning the discs and putting silicone grease on them on reassembly. Worth a try.

Normally would be central and 150mm apart, hot on lhs. Though if you take into account your screen which will sit on the top edge of the bath, you could have the valve slightly to one side so it's central between the screen and the wall....

Normally Red=Live Feed; Yellow=Live Return (Switched Live from 'stat); Blue=Neutral. http://na.heating.danfoss.com/PCMPDF/RETB%20instruc.pdf According to page 5 of the above, the Danfoss just needs the Red to Terminal 3, and Yellow to Terminal 2. The above needs to be confirmed with a...

One of these can be a life saver if you can't turn off the supply! http://www.toolstation.com/shop/p39855

From what you said, I gather you had 240v between live and neural, but 0v between live and live, which is correct!

cut it back and tape it Isolate and make safe the blue. .... same thing :lol:

If wired correctly 'at the other end', I would expect blue to be neutral, red live feed, yellow live return. Your old stat needed a neutral feed to work properly, your new one doesn't. At the moment your stat is connecting live and neutral together causing a short circuit! Therefore, you need...

What do you mean by a false wall? Gas pipe can be installed behind plasterboard - is it's 'dot and dab', the gas pipe should be wrapped with tape then enclosed with the 'dab' adhesive. If it's nailed to battens, then there should be a battens either side of the pipe all along it's length. If...

I do normally. If not, ring of plumbers mate aswell!

If you do consider going unvented you'll need to make sure your mains flow and pressure is okay. If not, keep it vented.

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