9100

9100 t1_iucsx8l wrote

Depending on who is doing the cert it's either going to not get tested (I see loads that pass every year but really shouldn't and have glaringly obvious visual faults) or they do the tests but don't understand the results so just pass everything anyway.

So just because there is a certificate doesn't mean that you can be 100% sure it is 100% safe, and besides, that would only apply on the day of the test, there could be a fault develops in the intervening year between the certs.

I would rather have the CO detector than just hope that it's fine. If it's a rental (which I would assume it is if it needs a cert every year) then I would always put a CO in every room with a gas appliance to be on the safe side anyway for what they cost.

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