I was doing a routine check for water leaks at home today, I just observe
the little 'spinning' wheel on the water meter with everything turned off to
make sure it's not moving - it wasn't.

Then I started thinking. The meter works by way of a little turbine wheel
that spins in proportion to water flow and is geared to the counter unit. I
wondered if the turbine needs a certain minimum flow of water to overcome
the meter's internal friction. So, by opening a cold tap just a tiny amount
(just little more than a constant stream of drips) I observed that the meter
wasn't rotating at all. My theory would appear correct.

So, what if I fitted two ball cocks to the DHW header tank? One half way
down the tank to work normally and one at the top with a stop valve upstream
throttled to allow a drip feed only. With this working 24/7 I should get
'free' water maybe?

I'm not from Yorkshire BTW, I just like the idea of getting something for
nothing!

Julian.