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Not familiar with the Seville but my (Triton) 80Z power light is illuminated once there is power to the shower, ie, power from the CU ("fuse board") to the pull cord and the pull cord switch ON, there's also a indicator in the pull cord cover, older types have a mechanical red flag type...

Well, if the depressurized and filling pressures are the same, in your case @ 1.4bar, then the tiniest drop of make up water will restore the boiler pressure. The main reason for having a difference of ~ 0.5bar between the precharge and filling pressures is to give a nice little water reserve...

You say it takes minimum input to repressurize it. If you have say a 10L EV (expansion vessel) that might normally be pre charged to 1.0bar and you then charge it to 1.4bar, then that will take 1.67L to do so which means that you are possibly losing/leaking 1.67L each time the boiler pressure...

I have one of those showers (but 9.0kW), it's quite easy to test the solenoid coil resistance without even taking off the shower cover, switch out (down) the shower RCBO/RCD, ensure pull cord switched on and press the shower start button then check the resistance between the (RCBO) load side...

Just generally fault finding, it's quite easy to test the solenoid coil resistance without even taking off the shower cover, switch out (down) the shower RCBO/RCD, ensure pull cord switched on and press the shower start button then check the resistance between the (RCBO) load side L&N, a healthy...

Sounds like it could be a weak/failing solenoid coil or a faulty pull cord isolationn switch.

The immersion tank is the HW cylinder which is supplied from that water tank...the cold water storage cistern (CWSC) In the attic, it is normally heated, like yours, with hot water from the boiler circulating through a coil in the cylinder or with a electric heating element, the immersion. The...

On the very rare occasions that my CWSC has run dry, there is always a airlock in the hot side once the CWSC has refilled, don't know if its in the CWSC supply or in the HW outlet to/from the HW cylinder, My mixing taps are mains cold and gravity hot where the mixing takes place in the spout...

Almost like trying to get blood out of a stone.

Its the best hydraulic efficiency on the CC3 curve, not sure why its shown, you can see it in the calcs if you do the exercise at 3.5M & 1.8ms/hr. The overall efficiency is 42.09% so a hydraulic efficiency of 69.2% means a electrcal (motor) efficiency of ~ 42.09/69.23 (x 100), 60.08%, there are...

No the efficiency for both is the same in the examples I gave in posts #14&16, the hydraulic power required, is, (using my calc) (MXLPM)/6.14, so (3X16.666)/6.14, 8.143W, actual power ~ 21W, Effic=8.143/21, 38.78% Its difficult to give a fair comparison for the UPS2 vs the 6M Wilo as the UPS2...

They all have the same/very similar efficiencies, the UPS3, above, on CP1 at 3.0M & 1ms/hr (16.7LPM) flow consumes 22W, my Wilo Yonos Pico 6M would consume 21W. Unfortunately, the UPS3 (& UPS2) do not display the power consumption, most, now, display the flow and the power consumption.

The UPS3 is a giant of a pump, 60W vs ~ 35/45W for other 6M pumps, also, its constant curves are, in effect, constant pressure curves so will still maintain a 6.2M head at over 19LPM but changing to CC1 will give a more reasonable setting at 4.2M or CP2 will maintain 3.0M, so not really the...

For anyone with a OV system, if installing a new circ pump, its well worth taking a photo or noting the original pump details and mode/settings as some systems are quite sensitive and can suffer from pump over/air ingress. I have seen more than one reference to the UPS3 which is supplied in...

No issues in replacing with either as long as the external dimensions are the same. Before purchasing the 5M Yonos Pico, have a look at the Selectric's speed setting, if its on speed 3, a 6M Yonos Pico might be more suitable, how many rads have you got?.

Eco power setting on most showers is generally ~ 60% of full power so yours certainly shouldn't be greater than say 5.0kW. At a present mains temp of 17C it only requires a flowrate of 3.12LPM to have a comfortable 40C shower, if it's just about reaching its cut out temperature of 50C, but...

A air pocket will build up in the "top" of the UVC when installed as shown. At the stated 40 deg rotation away from the vertical means the immersion elements and the stat rods/pockets are pointing upwards at a angle of 50 deg. Using a few assumed dimensions, ie cylinder dia of 560mm and...

While probably not related to this water hammer problem I wonder would it help if the cylinder was drained down and refilled with a HW tap opened.

That very strange orientation will probably affect the immersion/stats as the elements are designed to be horizontal, since you are familiar with electrics it should be very easy to check with a multimeter if/when the stats are switching, even turning them up/down should result in a audible...

Thanks, also take a photo of the details on the UVC itself under "Product Data"