The operation of the two generators is commanded by a proprietary logic developed by Sime, integrated in the remote control that dialogues with the boiler and heat pump via ModBus protocol.

If the external temperature is higher than a certain set value (default -7°C) the heat pump and the boiler will be activated in quick succession. When the set point is reached the boiler will start to adjust power until the heat requirement is attained and then both of the generators will be extinguished.

If the external temperature is higher than 7°C (value can be re-set), only the heat pump will be activated. The boiler will be activated only when the desired temperature is not achieved by the heat pump on its own.