"Grunff" wrote in message
...
IMM wrote:

Thermal store = immersed coil for DHW take off
Heat bank = an external high efficient plate heat exchanger. for DHW
take
off.

Not much diff then, really.

Quiate a bigb difference.

Ours has an immersed coil, but whether you
use it is optional. I didn't, preferring to use
an external heat exchanger.

You should have used the coil as a pre-heat. Also this can be used for low
flowrates and the pump and plate come to supply the higher flowrates. This
prevents the pump cutting in when the tap is on for a second or two, which
is quite common.