I've decided to take out my Vaillant ecotec 418 on a conventional system and change it for a combi with a pretty good hot water flow rate. I am considering the Vaillant 831He because it has a HW flow rate of 12.4 L/m. I'm not sure if that's good but it's 25% better than the lower rated models. But, it's pretty expensive at around £1150.00 so i was wondering if some of you guys could recommend an alternative condensing combi with the same good reputation and a good flow rate please. Or is this the best one i will find and, i'll get what i pay for. Any advice, suggestions please? 

