Our 31 year old Potterton BBU has finally croaked. I'm slightly reluctant to spend £4k on a new boiler, especially as I'll probably need a new flue (doubt if the existing one's up to modern specs), all the radiators are old, grotty and have seized valves etc. plus we have 8 rads but hardly ever use more than 4 of them - e.g. never need or want to heat the bedrooms.
I'm contemplating switching to some form of electric heating on a smaller scale - i.e. enough for our needs and no more. If I do this, I'd get a CORGI fitter in to remove the BBU and cap off the water and gas pipes. My remaining questions are:
1. Will my existing cylinder, being of course a double walled type to heat the radiators, be happy enough running on the immersion heater with no water in the outer cavity? This is presumably what would happen if I have the BBU removed.
2. Having removed and scrapped the radiators, can I just cut off the remaining (now disused) pipe tails and then just clean and plug the exposed ends with some suitable compound? If so, what? Silicon mastic? Or would I need to cap the tails?
Thanks for anyone's expertise!