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A water tube boiler is a type of boiler in which water circulates in tubes heated externally by the fire. Fuel is burned inside the furnace, creating hot gas which heats water in the steam-generating tubes. In smaller boilers, additional generating tubes are separate in the furnace, while larger utility boilers rely on the water-filled tubes that make up the walls of the furnace to generate steam. The heated water then rises into the steam drum. Here, saturated steam is drawn off the top of the drum. In some cases, superheated steam is generated by an economizer. This is then passed through a superheater to improve the efficiency of the steam generation process.Water tube boilers are more efficient than fire tube boilers, generating more steam but using less fuel. They are also much safer, as the tubes contain far less water than a fire tube boiler and thus contain less risk of explosion.The essential characteristics of a water tube boiler include a furnace or combustion chamber, tubes that make up the walls of the furnace, a steam drum, and an economizer. The furnace is the space in which the fuel is burned. The tubes that make up the walls of the furnace are water-filled, and as the combustion gases pass through them, they heat the water and convert it into steam. The steam drum is a large chamber at the top of the boiler in which the steam is collected. The economizer is an additional section at the end of the boiler in which the steam is heated further by the hot exhaust gases.Water tube boilers are commonly used in power plants, paper mills, chemical plants, and other industries where high-pressure steam or hot water is required. They are also used in marine applications such as in ships, where their compact size and high efficiency make them ideal for tight spaces.When selecting a water tube boiler, it is important to consider the size of the boiler, its efficiency, its safety features, and its cost. The size of the boiler will determine the amount of steam or hot water that it can produce. Its efficiency will affect how much fuel it consumes and how much steam or hot water it can produce. Its safety features will determine how safe it is to operate and maintain. And its cost will determine how affordable it is to purchase and operate.Water tube boilers are an efficient and reliable source of steam or hot water, and they can be used in a variety of applications. By carefully considering the essential characteristics of a water tube boiler, as well as its size, efficiency, safety features, and cost, it is possible to select the best boiler for the job.