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Check the smaller head tank for water in the loft if you don't have a pressure gauge and filling loop.

105e or Instant 105e?

Providing the new boiler isn't far away from the cylinder. It is a good choice but there is nothing wrong with Vaillant vSMART which is a weather compensated control to modulate heating.

I referred one for Vaillant fixed price repair early this week, the customer was told the same thing as OP, it is a contract with Domestics and General. It seems better than Vaillant own package, so the customer went to 6 month contract by £50. The local Vaillant engineer turned up on the second...

More like a circulation problem.

Viessmann 200-W, a flagship boiler with 20/1 modulation ratio, is beyond most of heating installers. As far as I know it will work with Tado radiator TRVs but don't know others. Do some home work and call a Viessmann expert installer.

@Gasguru and @muggles dose this model have a filter in? F9 is the same as F75 on Vaillant.

Well, you wish to get a help from scratch?

His wiring is still working.

975 3 to 715 1 975 1 to 715 3 975 4 to 715 4

Yes. Can't set pre heat from Nest

"ATC on the right, numbered 3(NO) - 1 (Com) - 2(NC) + earth (also left to right)" Should be the same connection, ie, 1 to 1, 2 to 2 and 3 to 3.

I am going to spend some time to read Evohome now.

More about comfortable heating than gas bill saving. Also from the internet some installers suggested Nest isn't good on Opentherm.

Very busy now. The over heat stat is obsolete now, but might be able to get it off eBay. I found more times it is higher contact resistance than a faulty over heat stat.

I work for Corgi a lot.

The Combustion Chamber, a gas safe registered engineers only forum.

Ian, muggles is a heating engineer in the CC.

If you turn on hot water only, and see the boiler is firing, the position of the valve should be at W. If not, the valve is faulty.