Profile: Smith Hughes specializes in providing process steam and hot water boilers. Circulatic® steam generator is a forced re-circulation water tube boiler in which water under pressure circulates at high velocity through a set of nested, parallel connected, coils while forced draft combustion gases travel across the coils. The hot gases envelope the entire tube surface, making maximum use of both radiant and convective heat to achieve very high heat transfer rates. Water at saturation temperature is drawn from the steam drum and forced through the coils at three times the maximum steaming rate by the re-circulating pump.