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This shower head is advertised as giving an improved spray from a low gravity system compared with the Grohe Rain shower head. The fact of the matter is that it is actually wors on rain setting and really has no power on the other settings. Overall it was very disappointing.
It claims to work well on a low pressure gravity system, but that is not the case in a bungalow where the hot water tank is on the same level as the shower, although that may not be the case in a two storey hose where the hot tank is upstairs.
I purchased two Grohe Tempesta 100 Shower Heads to fit to two Grohe showers where the original heads had deteriorated due to water scale. The new Tempesta 100 Hand Showers are very disappointing indeed; compared with the original shower heads, the water flow/pressure is very feeble, irrespective of the selected spray setting. I have for now refitted the original hand shower which operates far better even with the accumulated scale. I made an unfortunate and expensive error in buying these.