Most boiler manufacturers require a power flush is carried out to qualify for their extended 7/10 year warranties. Must be a nice little earner for plumbers fitting a new boiler!
I think I would prefer a chemical flush or physical radiator removal / clean. For my last new boiler i flushed the sytem using tap water, but lots of it. Boiler has now passed the 7 year point. I self installed, but left final gas connection/ commissioning tests to a Gas safe friend.
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