Water heaters available in Indian markets are of two kinds: one with thermostat setting visible and is changeable and the other where thermostat is not visible from outside and you cannot make any setting changes. Those with changeable settings have knobs to rotate (as shown in the picture below) to change the temperature setting. Those that do not have changeable settings, mostly have a default temperature setting of 55-60 degree centigrade and have green and red lights to indicate if the water heater is heating water or not.