... Can be combined with other heating system,such as diesel heater,wood burner etc as a hybrid heating system,make domestic ... ,double,there or fourWorking pressure: 6 barCan install electric heater to back upSolar CollectorCollector size: can 10,12,15 ... : 6 barHail resistance: < Ø30 mm Low temperature resistance: > -40ºCSolar WorkstationIt inlcudes a multi-function intelligent controller,circulation pump ...