A household furnace is a major appliance that is permanently installed to provide heat to an interior space through intermediary fluid movement, which may be air, steam, or hot water.n industrial furnace or direct fired heater, is an equipment used to provide heat for a process or can serve as reactor which provides heats of reaction. Furnace designs vary as to its function, heating duty, type of fuel and method of introducing combustion air.
Need for Water Like all living things, plants need water to survive. Plants use water to maintain their shape, obtain energy through photosynthesis, collect dissolved nutrients from the soil, transfer small molecules throughout the plant, and cool off leaves in hot weather through evaporation. Because they need so much water, plants must have an efficient system to collect it. Roots. Plants obtain water through the soil. The roots are the transportation system to get the water from the soil and to the parts of the plant where it is needed. The roots branch off into smaller and smaller roots, and the smallest roots are called root hairs.
Some plants are as much as 95% water. Click for more. Water, which can make up to  95% of the weight of a plant, enters the plant through its roots. Carbon, which makes up the most of the rest of the plant, comes from the air and enters the plant through holes in its leaves.