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I've brought the boiler thermostat down to 1 or 2 now from 5 before. It helps as it turns off quicker and I don't have to endure the noise for so long but no solution. If you had to suggest a chemical solution to put into the system what would you suggest? Thanks. Rog.

I don't want to use the phrase but I suppose it sounds like it's kettling. It's a roaring sort of a noise when the boiler gets hot. I don't have to bleed the radiators, no. Thanks for your interest. Rog.

I have a 15 year old system based around a Barlo Balmoral 55F boiler. Just before Christmas I descaled the system with Fernox DS40. Afterwards it ran silently but recently has become very noisy again. With the rush of Christmas I didn't put any protection chemicals in after I'd done the...