You know, boilers are like unsung heroes of our homes. They toil away in the background, keeping us warm and cozy. However, a time comes when they whisper (or sometimes shout) that they're ready for retirement. Having lived in Edinburgh for quite some time, I've picked up a few signals that might indicate your boiler is on its last legs. An unexplained spike in energy bills is often the first clue, much like an unwelcome surprise in the post. Strange clunking noises can be another, reminiscent of a ghost banging on the pipes! Reduced heating efficiency and frequent breakdowns are flashing red lights that shouldn't be ignored. A friend of mine put off replacing her boiler for ages, and one cold winter night it gave out completely. Not fun. As I was looking into it, I found a useful page that could be worth your time. Just to add, always keep an eye on the boiler's age. Anything over a decade, and it might be time to consider a replacement.