"IMM" wrote in message
...

"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 big 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.

Another way is split the DHW and have the coil supply all outlets, except
the showers and baths where high flows are required, then the plate heayt
exchanger does that.

The coil has a pressure limit, so the coil supply would need a pressure
reducer before it and the cold supplies that are used for mixers also taken
after this reducer too.

The plates can go up to 10 barish, so no need for pressure reducers on this
leg for hot or cold and full power showers can be used, if the mains are man
enough.