On Wednesday, 25 September 2019 16:03:06 UTC+1, Chris Green wrote:
I've just discovered the existing (failed) boiler is a Vo[l]kera Compact
25 so that tells us the size at least.
What's a recommended replacement?

I don't know if the 25A would be a direct replacement.

https://www.cityplumbing.co.uk/Voker...62844/p/452673

In a flat, flueing may be more awkward to change so anything that will fit the same flue hole (or for elevated locations have a push-from-inside flue terminal) may be easier.

Owain