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I decided to try and get used to the drop in flow/pressure but unfortunately it seems to have reduced slightly again. I think I'll get the unvented cylinder serviced to see if that identifies anything. Any other thoughts or advice in the meantime are welcome!!

That makes sense and I'd say the drop off in flow rate HAS probably been in the region of 25% so working from your figures that would be 12LPM down to 8 LPM. The PRV only replaced in December 2023. Edited to add.. At the top of the grey PRV there is a small round back cap, I was expecting to...

Hi, you're right my terminology is not quite right. I can only easily measure flow rate but in doing so I know that the hot water flow rate is as good as it has always been and I have no issues with that, even after running the hot tap for a while. The flow rate from the outside tap is very...

Thanks for the reply :-) would this be the one?

Hi, I've been struggling with low water pressure inside my house for past 6 months...details as follows: Flowrate measured in street = 30 liters per minute Flowrate at outside tap = 24 liters per minute Flowrate at kitchen tap = 8 liters per minute Hot water pressure is decent and much greater...