We currently have a combi boiler, and like very much having hot water on tap any time of the day. However, we're getting an extension and it won't really be up to the task of serving the whole house (4 bed, 2 bath), and it's a bit (actually, a lot) unreliable anyway (Ferroli).
We're due to meet the plumber to talk about options but I just want to be better informed beforehand. Basically the only need - apart from reliability - is this: to be able to run 2 showers at the same time. Currently, if anyone's in the shower we can't so much as look at a hot tap without them being frozen to death. As for running a bath - forget it!
Is thit a failing of all combi boilers or are there models with beter "flow rates" that'll be up to the task? And is there anything else we should consider? They all just appear to be white boxes to me!