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Well after all that, and a bit more investigation over the weekend, it turns out that it is not the valve that is leaking - it looks like the heat exchanger is cracked again. We are getting water leaking only when the heating and hot water is off - ie when the boiler has cooled down. So Mr...

Most of the boiler was replaced about two or three years ago as we had a heat exchanger link. The heat exchanger and burner were replaced, and if I remember right the fan as well. Pretty much the only thing not swapped was the circuit board. Regarding the valve, are there disadvantages to...

Now all I need to do is find the correct replacement... Can anyone point me in the right direction from these photos As I mentioned in a previous post, there seems to be quite a variation in price - is this largely siren to the max pressure they deal with? (It looks like this one...

Thanks, I guessed it would be either air or pressure relief (although water pressure relief that just releases into the open seemed like a bad idea to me). There seems to be a big variation in price (£10-£60) for different types.. I'll take a look this evening to see if I can see a...

This is a view of the left hand side of the boiler showing the 'valve' assembley on the return pipe. Does this hero identify it? Thanks, FM[/img]

Can someone tell me what the vertical valve is likely to be that is fitted on the return pipe on my Bosch 24CBi boiler? The pipework enters the boiler from above and the pipework T's to go down to the return connection on the boiler and up to what looks like a valve of some sort. I noticed...