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For most boilers the internal expansion vessels are there for the water in central heating to expand and retract, but for this particular model, the expansion vessel also has another function to store pre heated energy for instant hot water. That is why this model is called "i", instant.

Why reinvent a wheel?

Agree! Go for a system boiler with a unvented cylinder.

Edited: sorry but thought in the gas engineer only forum, original reply deleted.

Yes, two connections to the expansion vessel, on Performa 24i and 28i, also Baxi Instant. One connection is flowing in, and another is flowing out.

Modern unvented cylinders have good insulation and little heat loss. So even you left the immersion heater always on it will hardly cost your more electrical consumption. It is by the amount of hot water being used by the occupants.

You are worrying too much. As I said at the beginning, an external expansion vessel is okay.

No the internal EV still has two sections, one is air and another is water

Take the valve head off the base (if it is detachable by two screws, not by four screws!), check the spindle rotation, lubricate it if necessary.

Ok for an external vessel.

No.

F25 is indeed low water pressure related, you need a good boiler service to charge internal EV and check PRV for not leaking.

F32 or F34?

The problem is that you as a DIY shouldn't open this boiler case. So ask the coming engineer about 24V link, he will know what I meant. Good luck for you.

If you are okay with DIY, boiler case off, isolate cold water in, drain off bit water, and replace a sensor. Make you know which is COLD WATER INLET otherwise you will kill your boiler!

Newly installed? Call an engineer to check wiring.

Of course you only need two Nests, but at least one of them is third generation.

Is it a combi Boiler?