You generally see numbers quoted per person for low, medium and high usage whatever that means but i,ve seen 50L/person "average" use so a 4 person home would require a 200l cylinder, water stored at 60C.
Maybe consider a instantaneous gas fired water heater, if your gas supply pipework can support a 40kw unit then even that will give 16.4LPM with a 35C rise, say 45C from mains at 10C, 4.1LPM per unit, a 50kw will give 20.5LPM, over 5LPM/unit.
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