Heat flow meters belongs to the family of instruments which are used for the measurement of flow of gas through closed conduits and channels. Heat flow meter introduces heat into the flow stream and measures the dissipation using different usually one or more than one temperature sensors. Such method of measurement is best suitable for measurement of gas flow considering the variability of heat absorption rate of liquids. There are two key techniques to measure the amount of heat dissipated; however, thermal flow meters uses heat to measure the flow stream. The thermal flow meter primarily finds application in oil and gas, water and waste water treatment and chemical industries among others. Increasing demand for heat flow meters in the oil & gas and water treatment industry is expected to drive the demand for the heat flow meters during the period of study, but introduction of the new advanced technology meters with sensors and their growing penetration is expected to be the key g...