I'm unsure if there is enough inhibitor in the combi system at my mum's. Must the system be drained down and then refilled with fresh or may I just add some (different as I don't know what's there if any) inhibitor?
AJH
It's important tohave inhibitor in modern systems with lots of reactive metals. You need to drain down & start again as you don't know what's in there. Some different makes are apparently incompatable.
It won't cost any more, you have to buy a fixed amount anyway.
There is a self-adhesive label on most bottles, it should be completed and stuck on the boiler. If there's no such record, I'd drain and re-fill.
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