The water source of this house is from the underground. It means the house use ground water. It was raised perhaps by a machine. After that, the water runs through pipes and is sent to cold water tank at the roof. Before, it reaches the tank; some water is flows to bath, wash basin, and toilet. In cold water tank, the water is in storage. From this cold water tank, the cold water is sent to hot water tank. In hot water tank, the water is heated up into hot water. After that, it is sent to the sink, bath, and wash basin. It means, the inhabitant can use hot and cold water from the bath and wash basin.