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Thanks Oilman. The system and boiler (Ferroli Roma) are 11 years old. I have found no evidence of leaking. I was making a layman's assumption about a leak.

I have an open system with a Myson pump 3 years old running at speed 3. Recently I have had hammering from pipes and water returning to the refill tank. I stopped this by bleeding the radiators (something I have to do regularly now so I think I have a leak somewhere). Anyway over the last week...