Gas fires are the modern fire-places. In the houses constructed in the olden days, there used to be an enclosure connected to a chimney on the roof top. The enclosure was used for burning pieces of wood and charcoal. The fumes produced on combustion escaped through the chimney, while the heat liberated from the combustion was used up for warming the room. This was the situation in the good olden days. These days, the fire places have almost vanished. Due to scarcity of wood and charcoal and environmental hazards, fire-places are no longer preferred. Even though some amount of wood is available in the forest, there are many restrictions imposed by the government for cutting the wood. The available sources of energy these days are the petroleum and the gas.