My point is that if they are prepared to tolerate the flow rate from a 9.6kW shower then they ought to be even happier with the equivalent of 15kW+ by sharing a combi.
Yes, I understand that (IF one could achieve equal sharing), but I was suggesting that both simultaneous users of combi-powered showers are likley to 'turn them up full' so that, as you go on to say...
... but not just that, but very careful attention to plumbing and 'matching' of the showers so that one of the two does not simply 'hog' much of the available hot water supply. That might not be a trivial exercise. I recall having that sort of problem when I inherited two mixer showers fed by a partially common feed from the hot water cylinder. Until I changed it so that they had separate feeds, one of them (I presume the closer one) always tended to 'win' in the battle for hot water!
Same at my girlfriends house, the have an oil fired boiler which they can use, but the majority of the time the heating and hot water is supplied by the Stanley which burns what even can be had for and economical price! Big old farm house, your there during the day anyway running the farm, so why not. If its just been ticking over and you want a good long shower, chuck some wood on, open the air up and get roaring, when the pipes start clanging and banging you know it time to get in the shower....
Ever since I saw TTC's post, I've been eagerly waiting to see if anyone would be petty enough to come up with that comment, so that I could offer them the "Pedant of the Weekend" award - a little late, but you've restored my faith in the continuing health of pedanticism!
If you want to limit the 'performance' of a mixer shower to what can be achieved by an electric one, yes - but many people would probably regard that as destroying the main advantage of having a mixer shower!
If you managed to get 30kW out of the combi, then that would be true. If you only got, say, about 25W, I doubt that you'd notice much difference from 2 x (10kW or so) electric ones. The real pain/shame would be that you would be limiting the performance of the mixer shower to a lot less than its cababilities when you were only using one at a time (which would probably usually be the case).
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