My Ariston Genus 27+ boiler (with internal DHW storage tank) has started leaking water out of the overflow, and on investigation the expansion tank for the DHW has failed - I connected a pump to see if it needed pressurising and water spurted out.
It looks fairly simple to replace it. I consider myself competent in diy although I have never done anything major to a boiler. Am I being too ambitious? Is it possible for a non-professional to get the parts?
-- Chris Melluish