The new circulators of the Calio-Therm S NC series pump hot drinking water in closed circuits. (© KSB Aktiengesellschaft, Frankenthal, Germany)
The new circulators of the Calio-Therm S NC series pump hot drinking water in closed circuits. (© KSB Aktiengesellschaft, Frankenthal, Germany)

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 says the 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.

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.

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. KSB says in this case, hot water is available at the tapping points without any delay.

KSB Aktiengesellschaft, will introduce the circulators at this year's regional trade fairs Bautec and SHK, as well as at the IFH.