The Outer ABS Body of the tank makes it light weight and shock proof. The 6 Bars Pressure High Working pressure that is double that of ordinary water heaters. 99.9% pure copper tank is For long life and corrosion free performance.Has single, high quality weld joints. The Multi Function Valve Acts as pressure release valve, non-return valve, expansion valve, drain valve & vacuum release valve.(Only for 3 Litres. The unmatched 10Years Guarantee On Copper tank. Backup safety device cuts off power at 90°C. Prevents overheating. Venus is the First water heater company in India to be awarded the prestigious ISI certification. This guarantees safety and gives the assurance of high performance.