AO Smith water heater of 25 litres capacity is being used by me for the past 5 years and till date its performance has been wonderful. Heating of the 25 litres happens within 10 mins for medium temperature of water. There is temperature control knob which can be set between low, medium & high levels. The heat loss is very very minimum(experienced that once the 25 litres is heated the water is sufficiently hot for taking bath the next day). Worth the value.