Terminating wiring using AC2 to Water Heater


Firstly I apologise for the diagrams as they are not very flash but hopefully convey the message.
I have a Multiplus 2 GX (5000/220/125) and want to utilise the AC2 outlet for dumping excess solar to the water heater. I am happy with the programming via Ve Configure but have a question regarding terminating the AC outputs.
Currently I utilise a remote single pole switch in my saloon to activate a solid state relay to turn on the water heater via my main Circuit Breaker panel as per the diagram. I propose adding another circuit breaker into the circuit from AC 2 to terminate at the water heater as per the purple and grey lines. Is that an acceptable solution do you think? TIA