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I think it was put there to confuse the **** out of some future ex-engineer homeowner.

And it's more likely to be suitable for low temp heating when we're forced down that route.

It's about resistance and the pump's ability to ensure flow rate suitable for all rads on the system. 22mm carcassing with 15mm loop offs is always much better.

Yes. You have to do what you have to do. However.... Beware if it will pass behind appliances as these now normally go all the way back to wall with no service space.

Test flow rate with couple taps open. Then "ask" supplier to text at their stopcock. This will give you an idea of performance.

This ^^^

Wonder if the vado pop-up is all plastic mechanism? Tbh, having installed hundreds of them, it's never occurred to me, until now, that stepping on the dome could damage the mechanism!

Indeed. As this is also essential for when the trap needs cleaning out of hair and oily bath products.

Yes. But depends how big the hole is and how much is crossing over! But generally, this is a sign... As is cwsc filling up if no hot water is drawn off.

Tbh, I forgot what the thread was about. As above. 2 separate systems! But... Compromised if coil is holed... This then joins the 2.

Well, that's new info. Certainly worth investigating.

Well. He spent 3 hrs on site and is a plumber. So he has a much better handle on it that anyone else. It's down to you and your faith in him. That's the nature of things. Life don't come with a guarantee.

With G3 ticket?

You can never have too many stopcocks... I'm happy when I can find any inside! :mad:

When putting new one in. Put a tesla service valve on for future recharging without full drain down. https://www.bes.co.uk/expansion-vessel-service-valve-3-4-bsp-pf-x-3-4-bsp-swivel-union-26402/

Would you apply it to 2 combis?

Well the 2 combis could be running at max for DHW at the same time so without seeing the setup, it sounds close to the limit.

Do you have those calcs?

We have to assume hot water requirement as why else a combi? If heat only then a cylinder will be needed. So, 24kW for the DHW supply perhaps?

So that's 65kW total. Pushing a 6m3/h meter. So he's right to be doing some calcs. Purge volume may also be an issue.