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See the extra valve you added, full bore brass job or something smaller like an appliance shut off or a push fit plastic one?
Lots of them have a very small orifice vs full ID of a pipe. Plastic push fit pipes also have a slightly smaller ID than copper, if you add a lot of bends and tee's you loose flow rate.Water used to enter our flat in honestly the most hectic way I've ever seen. Took all the floors up and started again. Also ran full fat 22mm from mains stop cock to the boiler, shower and kitchen with nice curves instead of elbows. The difference was huge. Well worth 3 days of dusty hell.
BrickMan
Haven’t flushed the pipes at all - would that just involve turning everything on and then switching off the mains stop valve? I’ve added an extra service valve for accessibility but that’s it.
I’ll triple check that the isolator valves are all straight later for sure - huge difference in flow rate compared to the utility room next door too. It’s just weird that it’s both the hot and cold seem to flow at the same rate.