"Colleague had one of them spring a leak, it had to be replaced. He bought the house new, ten years ago. Was told that was about its expected life, the same as the boiler."
With respect, this is cobblers. Pressurised water cylinders typically have a 25-year warranty. We've had one here in our current property since it was installed when the house was built in 1996.
Boilers are shorter-lived. Modern condensing boilers should last for up to 15 years. In my earlier post about replacing one of these, it had in fact managed 14 years. This is in the house I rent out. At home here we replaced the boiler in April of this year; it had lasted 12 years.
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