Hi @david_elks.
There was some discussion of this on Daikon Altherma 3, sub 2 DHW COP.
In post #9 I put forward the (pragmatic) view that heating DHW in two or more short bursts may help do this (if you can predict when you want hot water, and are able to programme DHW heating accordingly).
If you don’t want to get bogged down in the theory, you could always give it a try…