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@hippy
No idea. Isn't there some maths nerd about.. ?
In short, if the question were to be "Can I have a 'power' shower?" the answer is yet another question, "Have you the right hot/cold water system?" If you have a mains pressured system capable of supplying a minimum hot water flow rate in the region of 12 - 15 litres/minute at as maintained temperature of 55-60 C then the answer would most likely be "Yes." If the system is gravity storage, a pump is necessary for a 'power' shower.
http://www.plumbingpages.com/featurepages/SAqualisaPumps.cfm