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The AHW(S) series is a high energy-efficient variable speed circulator pump, this series pumps provide 8 different modes selection, such as Highest/Lowest proportional pressure, Highest/ Lowest constant pressure, Highest/ Medium/ Lowest constant speed, and Night version to replace existing fixed speed circulators in order to meet most circulation systems.
STAIRS HW series residential and light commercial hot water circulator pumps constitute a complete range of 3-speed circulator pumps. The pumps can be used in both open and closed systems. HW pumps are of the canned-rotor type, i.e. pump and motor form an integral unit without a shaft seal and with only two gaskets for sealing. The bearings are lubricated by the pumped liquid. This pump has 130mm or 180mm port to port dimensions to be chosen.