Natural circulation boiler - Wikipedia
Natural circulation is caused by the density difference between saturated water and heated water partially filled with steam bubbles. In a natural circulation unit the water tubes are connected to a loop, Fig. 4.3. Heat is applied to one leg, called the raiser tube, where the water–steam mixture flows upward.
The UM-HP Steam Generators are our natural circulation, high pressure steam generators (high pressure steam boilers). The internal coils of the steam generator surround the flame of the burner, absorbing the thermal energy and transferring it directly to the process fluid, in this case water.
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Boiler circulation systems: natural circulation and forced