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What size is the pipe? If it is 22mm it should be replaced with... 32mm, and rerouted to avoid any horizontal stretches that are not absolutely necessary. And, obviously, the lagging should be in good condition.

You need to consider what insulation/lagging does: it holds heat in, rather than generates it. Your water supply to your washer is cold water, and the water is probably sitting in the line most of the time. Thus during cold snaps, there is no heat to insulate (retain) and the water is able to...

Thanks very much for the help. The diaphragm was very worn and had a couple of small holes in it, which I suppose either let water through or failed to hold a vacuum. Either way, it's sorted now. Thank you, Internet.

Thanks for the advice. Now I just have to decide if it is better to buy the part and sort it myself (sound like a fairly straightforward job) or have someone come in to do it. If I have the Worcester folks come in for the one-off fix, will they sort out the whole boiler including the...

When I turn the tap on, the boiler fires up and runs perfectly fine for a minute or two and then spontaneously shuts down and the water just runs cold. If I close the water at the tap and then start it again, I get another minute or two of hot water and then it shuts off again.

My Worcester Bosch 240 has started acting up. When I run the hot water I can get a couple of minutes of hot water (very quick shower) and then it cuts out. If the central heating is on at the same time the hot water becomes luke warm. If the central heating is off, when the couple of minutes of...

Thanks for the tips. The under sized rads are only offset by the 8mm microbore with NO insulation. My flat is always cold. I'll upgrade to the 15mm plastic and get the thicker insulation. I'm looking forward to a much more comfortable winter.

So would I just cut the 22mm at the manifold and add the plastic from there, or am I better off going closer to the boiler (the existing manifold is about 10M from the boiler)? Also, can I go from the plastic back to copper where it comes out of the floor, for appearances, or should I just...

I have an old, but well running, Worcester Bosch 240 in my 500-600 square foot flat (ground floor, 1 bedroom, South facing, old Victorian property with an accessible crawlspace). It is always cold in the winter and I think I've realised why. All of my radiators are the flat, single panel...