Shower isolation switch

My first test would be to attatch a hose pipe to the shower supply pipe with a jubilee clip, and do the flow test into a bucket, and see what the flow rate in litres per minute is.

This will tell you one way or another if the water supply is ok.
 
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Sorry, just realised I'm having a plumbing discussion on the electrics forum. I was wondering if there was a problem with the switch (maybe a loose connection) whether it could affect the power to the shower which might affect the flow switch?

I will have to go back and check again for blockages etc.

I thought the way the post were going you would have realised that this is not an electrical issue, but down to water pressure as indicated by the controls on your shower.
Not sure what tests your plumber has done or the results of them, but you have a water supply problem, this could be down to faulty fittings, semi closed valves, scaling of pipes, blockages or change of water pressure by your water undertakers.
 
An electric shower generally needs a minimum of 1 bar and 8 litres per minute.
What on earth is the point of that?

An electric shower cannot begin to heat 8l/min. Even the most powerful struggle to cope with half that flow rate.

4.19J/gK - ye cannae change the laws of physics.
 
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This particular shower requires 1.5 bar and flow rate of 11 litres per minute.
A 10.5kW shower will raise the temperature of 11l/m of water by 13.7°C.

In the winter that will mean a shower temperature of around 20°.

Sooner you than me, Gunga Din.
 

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