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just seen you’ve amended your post - turn it off and open the window!
Yeah, it went higher :D
All windows in the kitchen open, and he's off to buy a new flue, pipe and siphon... the boiler will be OK until it's replaced in January as it's not failing on other fronts.
But the flue... I mean fuck, this thing has been leaking since installation because it doesn't even fit and never has done. I have service records going back a decade and not one engineer caught this.
At least it's going to be good after today, but this is today's four figure surprise.
Edit: just seen you’ve amended your post - turn it off and open the window!
Anything above 35ppm and I get people out of a confined space at work. Any reading at all and we’d prefer not to have anyone inside.
For an indication of cost, we recently paid just over £3k for a 35kw high-end Vaillant combi with smart controls, power flush, new thermostatic valves across the house and a new bedroom radiator. There was a fair bit of work involved in re-routing pipes/etc - they were here for three days IIRC.