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The only thing I can think of is run it on high setting, then change down to economy setting and see if there is any difference in the water temperature.Yes shower is generally being used on high setting mode instead of economy mode however even on high setting mode the temperature dial would only be set to about 50% as 100% is almost kettle temperature. Aware the hotter you put it the slower the water trickles through. However was wondering whether as on cold we are only getting 0.75 bar whether there are gains of 0.25 being lost somewhere/make much of an improvement? As on cold no heating elements are used therefore no bottleneck, should be a straight flow through.
I will have a go and experiment with the settings again, good point about a potential heating element being bust, would there be a way to test this? I believe the unit is dated 02/14, most likely manufactured date however it most likely is 3-4 years old now?
If no difference in temp, then I'd expect an element has gone completely. If it runs cold, without any heat at all in economy, then I'd also expect an element to have gone. If it is noticably cooler in economy setting, but there is some heat, then I'd expect the elements to be working as they should be.