In your first picture i see a stopcock, the pipe it feeds fills your cistern, but it also goes vertically on from there, so turning it off will...
Post a picture please.
Don't see why not, you can see a few rusty screws holding it on, you'd need to know your boiler model and go online and search for flue spares.
Fixed price repair.
I can't see clearly from the video, what is the pressure gauge on the RHS reading? A picture would be good.
Could be a bit of magnatec, do you have a filter?
When the burner stops only the pump will be running, is the noise still there at that point?
Was the boiler heating at the time of the noise? Likely causes would be pump or fan
15mm is fine for a sink, only a bath needs 22mm.
Is it for a sink in the garage? Taking the hot feed from the bathroom above will be fine.
Lots of money for a new boiler when all that maybe wrong with your existing one might be a noisy pump. Have you had it looked at?
You'll be fine, don't buy a boiler with its own controls, just use your existing setup with the new boiler.
Why are you changing the boiler? I've...
What's the boiler pressure showing? The only cooper pipe exiting outside from the boiler would be the prv.
But you can operate the switch with a small screwdriver
If the lever is manually moved to the fully on position are you saying it won't operate the switch?
If power was off all the microswitches should be off. You should then be able to detect if it switches when manually operated.
I meant he could see if it was stuck using a mark 1 eyeball first of all, plus with the power off continuity could be measured.
Try them one at a time downstairs, close valve's on the others and test individually.
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