Ans: The mechanism of the gas heater is built in such a way that it provides hot water on the go. Hence the heaters have a burner at the end, which facilitates the quick and timely stream of heated water. The exact location of the burner is the center of the heater and it heats the water flowing through the reservoir. Now the temperature variation depends upon you and setting the desired temperature depends purely upon you. The heat which is transferred to the water is basically from the LPG gas. The burner burns the gas through pilot light and this process goes on every time you use the heater.