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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"

Can you show exactly where the expansion vessel (Lower right??) is piped from, also the writing on the labels on all the devices on the cylinder eg. pressure reducing valve, expansion relief valve, and the temperature and relief valve (T&PRV) on the cylinder itself. Also, the vol (capacity of...

Have you tried any mods over the weekend to address the problem??

Just to recap. Original install: Only one (ICG) PRV, cold taken off the balanced ICG port, but EV take off from a T downstream of the ICG and not from the port on the ICG. Don't know if the system worked OK for 6 months or so? before water hammer, but a PRV was/is installed upstream of the ICG...

The "ideal" way I'd like to see that test done is to remove that PRV which is in line with and supplying the ICV PRV and reinstall it in a T off the mains and then take the cold feed from this.

When you say bypass the valve to the balanced feed are you suggesting blanking off the cold (balanced) feed port on the ICV and supplying the cold feed from the mains after the PRV that @Taconite5 has installed?.

You said in your very first post in your Water Hammer thread that "I've noticed since the install was about 6 months old I'm getting a water hammer/knocking/clunking noise from my unvented cylinder whenever the cold taps in my house are open and closed." Was the system trouble free for those...

Well, if you're pretty sure that the mains pressure is 4.5bar then those pressure spikes are normal enought IMO, I'd still like to see the ICG NRV operating "normally", not with a zero dP, but looks like you would have to remove the upstream PRV to achieve this. I can't find a exploded view of...

Are you still getting 8bar near the washing machine T off?, if so, maybe another arrestor here.