Temperature differential control unit for solar systems used either for the production of hot water for use or for combined operation with heating backup or swimming-pool-water heating
 

Vitosolic 200: Temperature differential control unit for solar systems used for the production of hot water for use and combined operation with heating backup with solar or also swimming-pool-water heating. It has a terminal for four relays for controlling four circulator pumps or four valves (the packing includes a temperature sensor for solar collectors and two sensors for the boiler and heating).