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It all depends on the system and the skill of the plumber. I usually get them to do it when they come for the annual gas safety report if the tenants have reported a problem. I've not had to get it done often, it seems to go along with a boiler that's underperforming.
You'd be looking at the plumbers call out fee anyway. You could try and figure it out yourself, I've never got my head round it. When the guys did it for me I was taken back how easy they made it look.
Airhead
Chalfie
Approx how long will it take to balance?