>> If it has a three way valve, no. The three way valve is incapable of
>> shutting off all flow.
>>
I don't think this is so. With a three-way port, if the water heating is satisfied, then the cylinder (which would act as a dissipator, albeit if well-insulated a limited one) would be isolated. All flow would be diverted to the CH circuit, and with full provision of TRVs then the same issue arises.
It is conventional to fit a bypass circuit after the pump in three-port systems in this circumstance (and mine has (a manual) one). (It also has two "free" radiators, one of which is in the hall where there is a room thermostat).
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