On 25/07/2019 15:10, The Natural Philosopher wrote:

Presumably they exist to make electric showers seem almost fit for purpose.


The heads I've seen today as a result of this question suggest not
suitable for electric showers. Perhaps because some of them draw in air
by first restricting the flow through a small orifice make them
unsuitable for direct heat electric showers that may require an
unrestricted outlet for safety. Perhaps a restricted outlet causes the
electric showers' safety valve to pop when the latent heat in the
element cannot be dissipated enough to the water on switch off???


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