I thought they had condensing Combi's ? or is that not possible. It is a flat (maisonette), and the whole point is to save space. We have hardly any storage, getting rid of the boiler/tank/top-up-tank will give us a lot more space.
I have 5 radiators - 2 'large' rooms, 3 small. For hot water supply we have shower, bathroom sink, kitchen sink and toilet sink. Only 2 people, but a 3rd on the way