No, please don't shut up . The more users that ask about a feature the more likely it is to rise to the top of my to-do list. To make it enjoyable, I have to find something to finish every few weeks. So, I'm often switching tasks when I hit a roadblock.

The differential gives you the lower temperature (setpoint minus differential) which triggers the DHW to re-heat. There's also the overrun setting in the controller menu which keeps the DHW valve open for the specified time after the boiler demand has stopped to extract further heat (I'm not 100% sure that this value is sent in the 10A0 message though).