Sigma4 Self-Priming
Sigma4 Self-Priming
Incl. VAT
Item number
- Fully automatic rainwater unit for supplying a detached house with rainwater
- compact and economical
- suction pump in the wall-mounted unit for pumping directly from the rainwater tank to consumers
- automatic switching between rainwater and drinking water depending on availability (manual switching possible)
- standard-compliant drinking water top-up with free discharge in integrated top-up tank
- with ZETA 02 automatic switch: less than 0.2 watts in standby mode
The fully automatic Sigma rainwater unit for supplying a detached house with rainwater.
It extracts rainwater from a storage tank and feeds it under pressure into the rainwater piping network. The unit controls the entire rainwater system, monitors the tank's fill level and automatically switches to using mains water if necessary.
Complies with DIN 1989 and DIN EN 1717.
Dimensions of the Sigma wall-mounted unit (in mm): W 500 x H 510 x D 315
Scope of delivery
- Aspri Plus self-priming pump, optionally with 3 or 4 bar system pressure
- Zeta 02 automatic switch with manometer for pressure display
- Integrated 9-litre refill tank
- Cover cap
- Float switch for controlling the drinking water top-up, cable length 15 metres
- Labelling kit
Structure and application area
The SIGMA rainwater unit is ideal for use in detached houses , as almost all components are assembled in a single housing. This includes the economical ZETA 02 control unit, the suction- and pressure pump , as well as the drinking water supply. Thanks to its compact design, the SIGMA rainwater unit is particularly easy to install , typically in the utility room or cellar. The integrated display also allows the pressure in the rainwater pipe to be read.
How it works
The SIGMA rainwater unit sucks the rainwater from the cistern and creates the necessary pressure in the rainwater piping network. When the tapping points are closed, the pump in the SIGMA switches off automatically after a short time. However, as soon as a tapping point is opened , or the toilet flush is activated , and a pressure drop is detected, the control unit immediately switches the pump back on. As soon as all tapping points are closed and the pressure in the line rises again, the pump switches off automatically again.
Combined suction and pressure pump
The SIGMA rainwater unit has a combined suction- and pressure pump. It sucks water from the cistern and pumps it under pressure to the consumers. The SIGMA rainwater unit pumps up to 66 litres per minute. Depending on the model, the maximum head is 34 m(Sigma 3) or 45 m(Sigma 4).
Uninterrupted water supply
During a prolonged dry period , the system automatically switches to drinking water mode, with the float switch in the cistern acting as a sensor . If necessary, the SIGMA rainwater unit can also be switched to drinking water mode manually. In addition, a small intermediate storage tank in the rainwater unit always ensures an uninterrupted water supply in the rainwater piping network.
Up to 97% more economical than other rainwater units in standby mode
The control systems of many rainwater systems consume up to 15 watts in standby mode , which constitutes the majority of the energy required for rainwater utilisation. With the efficient ZETA 02 control unit, developed in cooperation with the Technical University of Central Hesse, the standby consumption is reduced to less than 0.2 watts. This means energy savings of up to 97% compared to conventional rainwater units. The ZETA 02 is included as standard in the SIGMA rainwater unit.