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Thanks Agile. Definitely an interesting idea, I like the thinking; always open to hearing different ideas!

This is a portion of my central heating system that I'm currently re-plumbing. Boiler on the left, radiators on the right. It's a 2 zone S-plan system. The boiler is downstairs, flow and return go up, into the ceiling, through the joists (roughly level) for about 2-3 meters, bend up and over...

Ah, thanks Agile! That makes sense. It was a Y plan system, but I've converted it to a 3 zone S plan system, so that's why I'm seeing it in all of the stuff I'm reading. Just to avoid any ambiguity, am I correct in thinking that I should install the auto bypass valve as per the blue circle...

I have a very old oil fired boiler, a Boulter Camray 40/50 to be specific, from the mid 90s. I'm in the process of a large renovation and part of that has meant moving the hot water cylinder and re-plumbing most of the central heating system (excluding the runs off to the radiators). When I was...

Thanks! Now I've just got to execute on the plan!

Thanks, I've also since found this that looks like it would do the job too: https://www.amazon.co.uk/Adapter-Reducer-Plastic-Pipe-Copper/dp/B0D9NY21T9 Any reason to prefer one over the other?

Thanks for the info, should have thought to look it up myself. The below are the copper pipe dimensions if anyone else ever comes across this. 15mm copper has an inner diameter of 15 - (0.7 x 2) = 13.6mm. Upgrading from the existing 15mm to 22mm would only give me another 1.6mm (15.2 - 13.6)...

Thanks for confirming. Any chance you could comment on the other bits?

This is the rising main into my property (the spectacular image below). After the conclusion reached in my previous post, I'm looking at replacing the (currently 15mm) feed with 22mm throughout the house; this requires me to change the main stopcock, as the stopcock itself goes from this blue...

Thanks John. Take the decision away from me, that's what I need! :D

I've just measured again from a different tap (much further from the main feed) and I am actually getting 9.6L/min there. My Kitchen tap is a bit naff, so that could well be the issue there. Apologies for the red-herring. At what flow rate does 15mm copper start to become the bottleneck and...

As of right now, we're getting about 5.1L a minute on a tap very close to the main feed in. I don't know what's good/bad though and I assume a pressure gauge would be needed to get the pressure, unless there's a MacGyver-type way to find out. Thanks for confirming though, good to have a bit of...

I'm half way through a major DIY project and have a fair amount of plumbing to do (I've got a whole new floor of the house to plumb, central heating & hot/cold water). I took at look at the main feed into the house and it looks like it comes up in plastic blue pipe, I'd guess around 25mm, into a...