KSB´s New Drinking Water Circulators


KSB Aktiengesellschaft will introduce its new high-efficiency circulators of the Calio-Therm S NC series. The maintenance-free glandless pumps are designed for pumping drinking water in closed circuits, which are commonly found in single-family or two-family houses as well as in larger building projects.

KSB´s New Drinking Water Circulators

The new high-efficiency circulators of the Calio-Therm S NC series pump hot drinking water in closed circuits (Image: KSB Aktiengesellschaft)

Like the other Calio pumps the new circulators offer a high-efficiency permanent magnet motor to achieve top efficiencies. With one-touch operation the flow rate can be adjusted via three speed levels. In the event of a blocked rotor the motor stops automatically, and a fault is indicated. Three LEDs display the operating status. The screwed connections are available in dimension Rp ½ internal thread (EN 10266) or G 1 ¼ external thread (DIN ISO 228). The maximum flow rate equals 0.7 m3/h. The pump s maximum head is 1.0 m. The drinking water temperature should measure between +5 °C and +65 °C. The new pump sets, which are available in four designs, can be supplied with either a plug or a cable. This enables electrical connection without any tools. Apart from its simple standard design, the pump set is also available as a variant with integrated non-return valve and shut-off valve. The volute casing of the new pumps are made of brass, the impellers of technopolymer and the shafts of stainless steel. The wetted parts are made of polyamide.

Service water supply systems comprise a boiler, central water supply and several taps. The further the hot water storage tank from a tapping point, the more cold water needs to run out of the pipeline before hot water can follow. The new Calio-Therm S NC serves to pump hot water through the pipeline to the tapping points, and then back to the water heater through the circulation line. In this case, hot water is available at the tapping points without any delay.

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