I have a Vokera combi boiler (excell SP 80) which is probably around
12 years old. Lately is has switched off for no apparent reason. Even
though I have managed to switch it back on, what would you recommend
to do : have it repaired or changed?

Other question, when I asked for quotes to have it changed, the
plumber told me that the gas pipe is too narrow and the gas pipes
leading to the boiler need to be changed. This would entail major
work, so my question is : shy should I have wider gas pipes fitted?

Thanks in advance for all your answers