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The triple acting BTC also controls circulator functions. This employs a BTC that acts in reverse. The reverse BTC opens to turn the circulator off if boiler water temperature drops below a set temperature, typically to maintain a minimum boiler temperature in both the High and Low limit functions. The circulator circulates the heat transfer fluid to the heated zone. The Beckett AquaSmart comes equipped with the Department of Energy (DOE) 2012 compliant HeatManager. All models include the option