Stiebel Eltron SOM 10 is a private label RESOL DeltaSol Mx. Differential temperature control with digital display, programmable functions for solar domestic hot water systems and 29 selectable system layouts. 100-240 Volt operation. Control requires minimum of 2 sensors (6 are included) and will accept up to 12 sensors. There are 13 semiconductive outputs and one relay output for pumps or valves, as well as one output for VBUS data transfer. Equipped with a factory installed cord.