The thermal actuator from the TWA Group is used with small saddle valves and floor 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 NO (normally open) or NC (normally closed) versions. ABN-F actuators are used with floor heating collectors from other manufacturers. They are available in NO (normally open) or NC (normally closed) versions. Additionally, adapters are required for connection to the collector.