The thermal actuator from the TWA Group is used with small saddle valves and underfloor heating distributors from Danfoss. The actuators can be used with all electromechanical or electronic room thermostats to control independent circuits or zones. TWA actuators are available for various valve types and connections in normally open or normally closed configurations. ABN-F actuators are used with underfloor heating collectors from other manufacturers and are also available in normally open or normally closed versions. Additionally, adapters are required for connection to the collector.