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I live in a flat and seem to get this issue of water hammer when pressure changes. it's not just when i close a tap rapidly, can happen when washing machine takes water in. Mostly, hammer happens in the evening when boiler or taps or washnig machine are NOT working which suggests it is the...

I have a combi heating system with a 10y old vaillant that gets serviced regularly. Recently, my radiators have been making noises and yet after bleeding them, they are still there. pressure seems fine, radiators are hot, thermostat works fine, its just the clicking/hammering noise. worst...