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I'm dealing with an aging megaflow in one property at the moment. Looks like this summer might be the time to change it.
Combi boilers are still a bit of a mystery to me although the expansion tank in the workshop boiler needed changing around this time last year and that was a learning curve diagnosing and repairing.
Heh, there's nothing better than a post-ride hot shower that suddenly goes very, very cold because your 20 year old combi has breathed its last!