The RESOL controller for standard solar thermal systems. The DeltaSol® BS controller provides a clear operating concept and is equipped with a display for system-monitoring. Flashing symbols for sensors, pumps and valves enable an immediate allocation of temperatures, temperature differences and active actuators.

Please Note these are no longer stock items and have to be ordered in from Germany.  The lead time can be up to 6 weeks.  For a suitable replacement use the DeltaSol CS controller.  View here..