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Heat pipes are very flexible systems with regards to the effective thermal control. They can easily be implemented as heat exchangers inside sorption and vapour-compression heat pumps, refrigerators and other types of heat transfer devices. Their heat transfer coefficient in the evaporator and condenser zones is 10(3) - 10(5) W/m(2)K, heat pipe thermal resistance is 0.01-0.03 K/W therefore lead to smaller area and mass of heat exchangers. Miniature and micro heat pipes are welcomed for the electronic components cooling and space two-phase thermal control systems. Loop heat pipes, pulsating heat pipes and sorption heat pipes are the novelty for the modern heat exchangers. Heat pipe air pre-heaters are used in thermal power plants to preheat the secondary/primary air required for combustion of Fuel in the boiler using the energy available in exhaust flue Oases. Heat pipe solar collectors are promising for the domestic use.