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right, yes, that's my plan, but it seems to me that most mixers cannot be mounted that deeply - or can they? Can a mixer be mounted 100mm below the surface?

Morning chaps, I thought this would be obvious but can't find it so here goes... I want to fit a concealed mixer to an internal block wall (4" thick). I can't chase it in because there isn't enough wall, but there is an airing cupboard the other side, so are there any deep fitting kits to...

Back to the OP's point, I've been looking at boilers and considering overspeccing our combi, but nobody's mentioned central heating so far. I've looked at a couple of online tools and used a 50W per m3 calculation, and I get to about 10-13kW for our 4bed, 160m2 house. Does that sound right...

Which isn't good? Specifically, is 16l/min what you'd expect from 3.0bar? If it's lower, then surely opening up the pipework would help? How is the mains pressure regulated? Is the street supply usually so abundant that you can't create a drop in pressure no matter how big your house's main?

well we have 3.0 bar static, and about 16l/min at the kitchen tap

So given that we're replumbing the whole house, how do you suggest I maximise our chances of a good flow at the shower(s)? We have a funny squashed-looking main that might be 1/2" (1956 house), and 15mm after the indoor stopcock, and lots of funky runs over doors because of our solid...

So how do you do that? Stick a pressure gauge on a tap and then open other taps till it reads 1.0 bar? And why 1.0 bar? What are you allowing for, other water use or losses in the boiler and pipes?

OK, so as instructed I went away and tried to find a good definition of dynamic flow rate - I didn't get very far! But I can see how it could be defined as 'flow rate at a given pressure, that pressure to be achieved by opening other outlets' - is that right? How do you measure it? I also...

@Agile, what do you mean by dynamic flow rate? I'm puzzled by the messages I see everywhere that combis can't manage two showers but unvented tanks can do it easily. Our electric shower at home puts out about 5l/min at about 45deg (so probably a 30-35deg rise in july), ok so it's not a...