Jyothi Ravi Shankar invented a multipurpose energy efficient utility stove, which captures the wasted radiated heat in a wood fired stove, to cook as well as heat water in a tall drum upto a temperature of 80º C simultaneously. The unit works on the principle that cold water flows down and hot water rises up. The arrangement consists of a stainless steel enclosure-envelope on three sides of a wood fired stove, and two pipes which are connected to the stove. These pipes are connected to the pipes from the boiler in the bathroom. Cold water comes in from the bottom inlet pipe, gets heated and passes out the hot water in pipes and fill a stainless steel water container. A separate tap is attached to the hot water pipe on the side of the oven to collect mugs of hot water for making tea, coffee etc. Thus while the food gets cooked in the oven, the hot water pours from the top into the tall drum placed on a stool behind the stove. In two hours, up to 150 liters of hot water at 80 degree centigrade is made available in the drum.