Work well with Hard Water Tank capacity-300 LPD/Liters Ideal for maximum 7-9 person, 3 Bathroom Connection Non- Pressure Type (Main Tank should be at higher height than solar water heater tank Glass enamel lining in the inner tank provides strong protection against corrosion. Advanced Solar Glass in the inner tank provides strong protection against corrosion. Full Plate abosrber provides greater area for absorbing of sunlight resulting in faster heating of water. Maximum Hardness of Water should be less than 500 ppm Maximum Pressure: 1 bar Warranty- 1 year. Electricity Bill Savings: 1620 units/year