I have also been told that if I purchase a 3 bar pump the shower will work with the combi.
Yes, sadly the way a combi-boiler works, it's at low pressure. And yes, it is possible to get it to work (in a fashion) by boosting the output pressure with a pump. But I don't think it's the right, and best way for you to go. If you go to a good Bath Shower place and ask advice for an electrically-operated proper (separate) shower, working off the mains pressure, -buy it, and have it installed, you'll have got the best of all worlds. The advantages of a combi-boiler, and the independence and pleasure of a good shower. But be careful to insist on seeing your shower demonstrated IN ACTION before you buy it.. Nothing worse than buying it and then having to put up with a trickle! A trickle that might be scalding, or cold!
