Jesus, keep your fookin hair on!! OK prob should've put the word effectively after "baths". You guys who find you have a good system with the combi for bathroom/en suite/WC prob have a storage combi or else about 8bar in the mains. Can't see how you'd get a good supply from a 3/4" bath tap fed by a 1/2" supply otherwise. And I'd be surprised if you get much more than 5 years from the boiler. If your drawing off 30gls of hot water you ain't getting any heat to your rads as the hot water gets priority. Personally i wouldn't fit them anywhere other than an apartment or small dwelling. IMO cant beat pumped storage and a pressurised cylinder. Then you'll get a good hotel style shower!!