"CO2 alarm fixes that." Didn't for him and I'm a bit mutton so might well miss it. For me it's peace of mind. The time I was nearly killed by it - we had one of those calor gas fires blazing away in an unventilated room - I suddenly started feeling woozy, sometimes you sit and see if it'll pass but I mentioned it to SWMBO and she felt the same. We were probably only a matter of minutes from passing out and becoming history, so you'd have to be a fairly light sleeper and pretty sharp moving if the alarm woke you. (I do also have an alarm btw).
I had BG do a Kamco (sp?) flush many years ago to address a problem ( - it did!) and it was over £300 then!
To do a flush properly takes maybe three or so hours and if your plumber doesn't own the kit he has to rent it. But you're right, it's just part of the cost. I was lucky - I sourced the boiler etc myself (under £900 IIRC) and I think I paid him £800 - near mates-rates really. Otherwise I think it'd have been £2.5k upwards - £4k for BG!
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