Totally agree. I’m thinking there maybe a restriction in the cwsc outlet, or even a faulty float valve - depending on when the bath is ran. We use hot water all day and bath the kids at nighttime.
Bath taps should be 3/4", although the supplies can be reduced down to 1/", depending on setup. If fed from gravity supply, I'd expect the pipework to be run in 22mm from cylinder/cistern to taps, otherwise if mains/unvented cylinder or Combi boiler then both supplies in 15mm should suffice.
What do you think is 1/2 inch ?
The supply pipe ? ( possible )
The thread of the tap tail ( not likely )?
You have told us that the hot water is gravity fed ,is the cold to the bath tap also tank fed or from the mains ? And how does the cold flow compare to the hot on bath tap ?
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