the simple answer is you can't.
thats why combis are only any good for small familys
a combi is not capable of running a shower and a ensuite at the same time.
a combi will deliver an average of 12 l/min at 35 degrees
run two showers at 12 l/min = 6 l/min each.
you can only take out what your mains cold will put in
so if you run one tap that will have good flow
run 3 cold taps then flow is reduced.
then end of the day combis are just a glorified water heater.
i meet loads of people that want a combi just to get rid of the copper cylinder and loft tanks to make room
but when you tell them they can't have their two bathrooms , washing machine etc running together they soon stick with a system boiler or a megaflow
you'll never beat a system boiler or if you want mains pressure at both hot / cold go for a megaflow system.
hi-spec plumbing
August 2007
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