Most 'economy showers' have an additional disadvantage because they crush the water into very small particles that create a formidable heat-exchange with the surrounding air, thus giving even a larger temperature drop downward in the shower zone.
Aerated showers have a particular disadvantage in that adding room air immediately lower the water temperature and the resulting champagned effect incurs further excessive heat loss as the water hits and travels over the body. Up to 30% of the potential savings are lost because of this heat loss. See Aerated Showerheads for further review.
Nordic Showers do not aerate and do not minimise the streams but delivers in thick cascades which maintains its temperature well because of the higher mass and surface area of the water load.