Just been through exactly the same process, but luckily I had a spare actuator in the man-cave.
You can get momo (motor on, motor off) valves but, ime, they are little more reliable than the spring return ones, and the valve bodies are different, so you can't just change the actuator.
They are more efficient, since the motor isn't permanently energised, but slower to react since they rotate only in one direction, and thus usually for a greater angle of rotation.
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