You are sharing the mains supply with others. If mains pressure poor, it will get worst when others using cold water
If incoming mains is 22mm, is it 22 all the way to the cylinder?
Are hot and cold balanced feeds.
I'm sure the guy from the water co said it was a 15mm main. And they'd charge me a few hundred £ just to do a survey on if it's possible to put in a dedicated main supply, and then it would be an enormous cost to get it into the house. No idea if the H&C are balanced
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