S-PLAN modification for solar PV/Heatpump with buffer tank, 2 UFH zones and DHW

[bob the fiddler]

I have looked at the S-PLAN wiring diagram (standard) for my new UFH/DHW system, but I don't think it offers me the best use of the new heat pumps resources, given i want to run the heat pump at low temp for a long time during sunlight hours only. Instead I came up with different control plan using motorized 2 way and 3 way valves, yet right now I don't have a system to control these valve, so ideas would be welcome, but is this sort of control plan viable?, can you please give pros and cons, or suggest better ways to maximize the power of the sun. DHW / UFH Valve Control

 

[Swwils]

Do not use s plan with a heat pump.