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Think it's already got one but need to remove a panel in the kitchen for a better look. Boiler was only fitted in 2018 and inhibitor was put in then, so I'd be surprised normally if it needed a flush already, but nobody was living here for the last few years which might explain a gunked up radiator?
Sounds like a job for Peter the plumber anyway as I want to get him into to move a radiator or two and talk about adding a hot water cylinder.
Definitely planning to keep the combi boiler as it's a £1300 Vaillant that was fitted in October 2018, just want decent bath filling capacity...
Worth powerflushing the system anyway as will make more efficient - dunno if you’re keeping the boiler but maybe add a magnaclean at the same time?