Siemens Building Technology SFA71U 25G Actuator 321894 708 Optimized Energy Efficiency: Facilitates effective Optimized Energy Efficiency: Facilitates effective heat recovery by diverting waste heat for space reheating Fenwal electrodes are often utilized in single rod (local) sensing applications where the same rod provides the high voltage spark and then detects the flame ionization current back to the control module This spring return valve actuator facilitates a mechanical fail safe in the event of power loss This actuator is typically used in commercial and residential hydronic systems to control hot or chilled water flow in fan coils