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If the bottom of the EV is above the top of the UVC, shut cold water supply to the UVC, open hot tap to depressurise, break and disconnect the outlet from the EV, re pressurise, (pre charge) to 2.8bar. If bottom of UV below top of UVC carry out similar procedure until HW stops draining, then...

You know where your new lever valve is, maybe disconnect here and try using compressed air to push any debris back through the system, they could connect to different outlets with the others shut off. I suppose there is no way that a combined lever/check valve was installed, and "backwards"??.

Do you get good flow if you disconnect the pipe immediately downstream of the lever valve, at least this will tell you if the blockage is downstream or upstream of it?.

Well. Something must be telling the pump to run on for a minute, if the cylinder heating is on and the cylinder stat is satisfied what does the pump do?

If you mean that "the room stat turns if OFF the boiler" and the pump continues to run continuously then something wrong if wired like you say it is, see schematic below, my oil fired boiler (no pump overrun) is wired similarly, then when the roostat is satisfied or programmed off, the zone...

Was that UPS3 installed with the original system ~ 7 years ago?, if so, and has been running on speed 3 since, then its simply incredible that you havn't had all sorts of pump over/air ingress problems in your OV system as this is a very powerful pump and will still run at a 6.4M head at...

It is very unusual with a gas fired boiler not to have pump overrun + a ABV (automatic bypass valve) for a a few minutes when the boiler stops, the pump would then be fed from the boiler, most of which hve the facility to provide power to the pump for this overrun time, however you have lived...

Can you see what type of vent & cold feed arrangement you have, you don't say whether oil or gas fired with external circ pump?, your system may look something like the attached (close coupled) where from the boiler flow, you have the Vent then the Cold feed (no more than 150mm from the vent)...

The kitchen tap takes ages even though nearest the HW cylinder but upstairs bath & shower do not, so one would think the kitchen tap run is the shortest?, pipe run etc' Only other thing I can think of (if not X over which apparently it isn't) is that the kitchen tap and the other, even when...

Do you have isol valves to the kitched tap and/or the bathroom tap?, if so close the hot one, put the lever valve to fully hot and see if any water comes out. Its very unlikely but your installer may have installed a isol lever valve on the cylinder HW outlet, if so, shut it and repeat the above.

Can you shut off the mains cold into the unvented cylinder, should be a lever valve upstream of that valve group and then confirm that there is no cold water coming from any of the taps. Are the (slow) kitchen and upstairs bathroom sink taps one lever mixers or are the hot and cold taps...

It's possible Xover from cold to hot, is the (balanced) cold supply taken off the unvented cylinder valve set like below??.

Installed one of these ~ 2 years ago to replace a long lasting (16 years) Mira Sport (more about this shower later). My mains pressure for years was a static 3.5bar so no problem with shower pressure required for the diaphragm switch to close the microswitches, for the past year or so the water...

Have you checked if the TCO clickes off ~ 10/12 secs after switching off the shower?.

What capacity EV (arrestor) and precharge pressure??

I think a "normal" on/off roomstat will still just switch off the boiler if the roomtemp exceeds the stats setpoint temperature, if you want WC only, just set the roomstat higher so that it will not switch off the boiler. My OT often drops by 5/7C overnight but my roomtemp by less than 2C (with...

Quite, Harry, or is it Quiet?

That 20 minute behaviour certainly doesn't indicate that the elements stayed energised after switching off the shower. The heating can including the two elements contain 0.23L of water (I measured it years ago on a similar 9kW scrapped shower) so this 0.23L will be totally evaporated in less...

Present (mine) mains temp is 12C, a showering temp of 40C (assuming a 9.0kW shower) requires a flowrate of 4.61LPM, if the showering temp reaches 48C (TCO, auto reset trip), then the flowrate must fall to 3.58LPM, if the showering temp reaches 72C (TCO final and no reset trip) the flowrate must...

Try that then, why not.