Leo
Thanks for reply. You say mains with good pressure should give stronger flow than tank fed shower. This does not make sense to me - if both mains fed & tank fed showers have the same wattage heating element, the stronger pressure mains, means that the water is going thro the heating element faster , & will not heat the water to the same temperature as the slower flowing tank fed shower - so you might have stronger flow with mains feed, but the water will not be as warm as tank fed unit.
In comparing two showers with the same wattage heater, the logic seems to me, that same wattage heaters will only heat the same volume of water to the same temperature in the same space of time, & consequently there is no difference in flow strength. Is there a flaw in this logic.