Got a Bosch Worcester combi 12 year old boiler on a 8 radiator system. Just
replaced the kitchen radiator with a larger one, flushed the system several
times but now when running the hot water the boiler is making a rumbling
noise. I'm thinking the system needs dosing with Fernox but after looking at
the Screwfix site I'm at a loss at choosing the right one. Which one should
I go for?
I cannot see how putting Fernox in the CH part of a combi will help reduce
noise in the HW setup. You do of course need to put inhibitor in the CH
system when you have flushed it out to prevent corrosion.
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