We have this havells geyser in our house and this stuff is a unbelievable stuff because it pretty faster and better than other geysers.
I call it unbelievable because it can heat up the water in about 2 mins and has good capacity of 15 litres which can fill at least two small buckets .
( Power) -It consumes less power and can even work under inverter or generator.
Display-it has a small display window which shows the hotness or coldness of water and even shows water avaibility.
This geyser comes with a 36month warranty and on-site warranty facility.