Thanks for your replies - so does anyone know if this boiler can be made to work as a pressurised system? How would I do that and what would be the approximate cost vs installing a new combi boiler?
I hope someone can help with this - I'm wanting to buy a new shower and I have no experience with plumbing. It's part of a loft conversion I'm having done soon and I would want a radiator up there too.
My boiler is a Potterton Prima F. No idea about it as it was in the house when we moved in...