In an earlier contribution to this discussion,
Stevethefootycoach wrote:

Thanks Roger.

does the Surrey/Essex flange boost the pressure of the hot water?

No. It just takes the water from a bit lower down in the cylinder.
Otherwise, if you have a very powerful pump, it can suck water - followed by
air - from the vent pipe, rather than water from the cylinder. A flange
prevents this - but isn't always necessary, depending on the power and
location of the pump.
--
Cheers,
Roger
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