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I agree with @TheShipwright get a different plumber. No sort of combi will manage three bathrooms well but contract plumbers like them because they are cheaper and easier to install. A well designed megaflow system should be just as efficient and much more reliable as the boiler doesn't have to fire up every time you turn a tap on.
The key is to have good flow from the mains, at least 22mm pipe, into the water storage tank. There should be a pressure limiting valve, if you take the cold water supply for shower and other mixer valves from between the valve and the hot tank then it should be self balancing with no need for thermostatic mixers. If you can site the water tank away from an outside wall any lost heat will stay in the building. A tank with twin coils is good as it can be adapted to solar systems later on and will heat up the top half of the tank quickly if you need it.
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Charlie_L
We have just had a plumber in to quote us a new heating system for a 5 bedrooms house with 3 bathrooms in london. So far we have been told megaflow is the way to go for this size house but this plumber recommends that we install the storage boiler instead and that if we wanted to go down the megaflow route he would even turn the job down.
His argument is that he installed megaflow in his dad house few years back and it was great until the pressure dropped and made the megaflow system worthless. He thinks that eventually water pressure will drop in most part of town with new build being built at every corner. He reckons a storage combi boiler will cost half the money and do the job just fine. Any view on this?
At the moment we have approximately 3bar pressure coming to the house. Megaflow needs at least more than 1.5 bar pressure to fully function. Thames water minimum pressure is something is like 3/4 of a bar.
Personally we could do with the cost saving and a cheaper installation but the last thing we want is to struggle with 2 taps opened at the same time.