Another question if you don't mind.
This hydrobox has the optional 200ltr domestic hot water tank fitted.

There were complaints of the water at the outlets being too high (68c)
Now, the leaving water temp adjustment on the controller seems to have zero effect.

In the sub menu's, the storage temp was set to 70c (default). I reduced this to 60c, which changed the outlet temps accordingly. The manuals seem to infer that the lwt adjustment on the controller should in fact control the lwt setpoint, but it doesn't. However, I can't see how it can without some kind of mixer valve to add cold to the hot to control the lwt?
Problem is, there are still complaints that 60c is still too hot. I don't want to lower the storage temp to less than 60c due to legionella.

Any ideas guy's?

Cheers