How long does it take for the actuators to open?

Our actuators are 230 V made by Jurgen Schlosser in Germany.  It takes approximate four minutes for the actuators to open when a programmable Heatmiser room thermostat is calling for heat.

The actuator comes with top and side indicators to show if the actuator is closed or open.  Power to the actuator will open the underfloor heating loop.