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Thank you. I think I’ve got it in my head now. One last question - Google AI says to position the receivers ‘at least 1 metre away from large metal objects’. Er, like a cylinder or a boiler?

It’s too late to get power showers but please could you point me in the direction of pressurising the hot coil please? Everything I’ve read about vented cylinders says the tank has to be above all hot water outlets.Thanks

Thanks for all the replies. I’m trying to keep up! I don’t fancy the idea of an annual call out either (or pressurised boiling water flying about!) but with vented, wouldn’t the water tank need to be higher than the top floor shower? That wouldn’t be possible, plus I’d have access issues...

Forgive my ignorance but I assume the cylinder thermostat is built in to the cylinder? So I run 5 core cable from the valve positions as well as the cylinder position, all back to the boiler position? And should the thermostat cable be 1mm not 0.75? Does it need to be in conduit or are there...

Thanks. Currently a 35kw combi boiler only but there’ll be 3 showers. I got a G3 plumber out to talk about adding an indirect cylinder, he thought the boiler would be up to it. I’m not so sure so I thought I’d lay the groundwork anyway. I’ve extended the CH pipes and cold water inlet to...

Thanks ericmark. I wasn’t thinking of ‘smart’ TRVs on the rads themselves but a type of gate valve that sits on a branch pipe of the CH flow. So say the back of the house is cold, it would allow CH flow to that branch but be closed to the branch to the warm front of the house until the...

Hello Hopefully this is not one for the plumbing forum. In the future I may add an indirect hot water cylinder and zones to my central heating using motorised valves so want to be sure the cabling is in place. Given the layout of the pipework the valves would be at the branches and not the...

Hello Following on from the advice I've had previously as regards inadequate 15mm CH pipework (thank you), I've now got as far as I can go with 22mm on the downstairs run. Luckily there was some 22mm copper in place partway through an area below a tiled floor, but it drops to 15mm where I...

Thank you so much Madrab, you’ve been very patient and I’ve learned a lot from you. (y)

Thanks It's a mix of notches and holes but will bear that in mind! Madrab - Thank you very much for taking the time to update the diagram, I am very grateful. I have one radiator (G2) which is 7000 BTU/2kW. G6 and G7 are both in the region of 5000BTU/1.5kW so together are 10000 BTU/3kW so...

Thank you Madrab, I mistakenly thought that if there was a radiator within 12inches of a 22mm pipe then all rads needed to be within 12 inches. If I'm now understanding it correctly, if I at least get 22m whereby there's a similar run of 15mm to the furthest of a 'family' of rads, even if it's...

Thanks Jahjahbinks. I’ve done exactly as you said - Marmox backerboard in the wet areas and m/r plasterboard everywhere else. I’m not finished yet but I’ll have to look into Regs as Marmox say their boards are waterproof and only need taping/sealing.

Funny you should say that- it's the only run of pipe that's in 22mm! Thanks for your help. I think the only way to achieve runs of 15mm will be to run 22mm up to the rads themselves! Can it be 22mm Hep? I know the diameter is less but will the increased size be sufficient?

Hello Am starting a new thread as, based on the advice I got (thank you), I need to upgrade my central heating pipework from 15mm to 22mm. I'm hoping to find out how much of it can stay and how much of it needs changing. In total there are 21 radiators totalling 23 Kw, across three floors...

Thanks to all, it’s really helped and I understand more now. I will bite the bullet and get 22mm pipes. The plumber asked me to send him a schematic diagram (which I’d like to do for myself anyway). Does anyone know if there’s a decent (free) drawing tool available? I looked at MS Paint but...

Sorry, would you mind explaining what that means?

No info, sorry. He ran two taps and used a container that was overflowing as it filled. I didn’t see him do the pressure but he mentioned about it being okay, and said something about it probably having a limiter on it, so no problem.

Is there any heating system that will work off 15mm pipes? If so might be cheaper to change the boiler than the upheaval of changing the pipes?

Thanks for the replies. Yes. I use smart bulbs already. I’ll stick with them!

There’s a 22mm to 15mm reducer under the floorboards below the boiler. I’m tracing it all now and will sketch it out. Thanks for everyone’s input.