I'm having an extension done and once its finished i think ill need a new boiler. I'm planning on having 11 radiators when its finished. (I have nine at the moment). I also currently have a bath with mixer tap/shower head upstairs but am planning on adding a dedicated shower downstairs. Right now i have a small glow worm condensing boiler. I was thinking of getting a combi. I would just like to get some kind of general advice about what brand/size/price etc I'm looking at because i have no clue what so ever about these things although ive heard valliant is the best. Advice is greatly appreciated.