Colour-changing LEDs that change from blue to amber to indicate the hotness of the water It is made of ultra-thick super cold rolled steel plates that provides higher resistance to corrosion resulting in longer life than standard inner tank designs Heavy Duty Heating Element for high performance & Quick heating Suitable for high-rise buildings and pressure pump applications. The multi-function valve prevents pressure to increase beyond 8 bars It avoids direct contact between cold and hot water flow for faster heating and optimized energy saving resulting in 20 % more hot water output