integer pressure solar water heater,export to Korea 1.Heat exchange instantly, water plentiful. 2. Fresh water quality integer pressure solar water heater:1. Material of inner tank chest ... , thickness: 1.5mm 4. Collector: ,58X1800MM.58X2000MM5. Heat insulating layer: 825mm polyurethane foaming6.7KGS copper coil inside inner tank. integer pressure solar water heater