... ,and two pipes inlet-outlet on the water tank.Details of non-pressure solar water heater: 1. Inner tank: Stainless steel SUS ... , 18, 20, 24, 30, 36tubes 7) Capacity: 100-360 litersSolar water heater Remark: 1. Solar heat storage tank diameter(mm): 410 ... . Vent connection(inch): 1/24. Electric heater connection(inch): 15. Water connection(inch): 1/26. Collector angle(degree): 30/45Optional accessories ...