P
Plumb Ugly
Although technically there are some components on some boilers you could replace legally you are putting yourself in the middle of a minefield and its really not worth the potential problems. I cringe now when I think back to when I was a newly qualified gas engineer and about how little I really knew so for someone with no formal training or experience to work on a boiler even the nono gas critical components is deeply worrying to me. Honest opinion boilers like any gas appliance are just one of those things that should be left to a pro its not worth it to save a bit of cash no matter how skint you may be at the time. This isn't meant to be a go at anyone its just my view from what iv experienced and seen over the years