Rainwater unit Sigma 3
€1,754.06*
- 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 storage tank to the consumers
- Automatic switchover between rainwater and drinking water depending on availability (manual switchover possible)
- Standard-compliant drinking water make-up with free outlet in integrated make-up tank
- With ZETA 02 automatic switch: Less than 0.2 watts in standby mode
Available, delivery time: 2-5 days
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 pipe network. The device controls the entire rainwater system, monitors the filling level of the storage tank and automatically switches over to the use of tap 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 pressure gauge for pressure display
- Integrated 9-litre make-up tank
- Cover bonnet
- Float switch for controlling the drinking water make-up, cable length 15 metres
- Labelling set
The installation and operating instructions for this product are only available in German and English. With your purchase you agree to this.
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Structure and field of application
The SIGMA rainwater unit is ideally suited for use in single-family homes , as almost all components are combined in a single housing. This includes the economical ZETA 02 pump controller, the suction and pressure pump and the mains water top up. Thanks to its compact design, the SIGMA rainwater unit is particularly easy to install , typically in the house service room. The integrated display allows to read the pressure in the rainwater pipe system.
How it works
The SIGMA rainwater unit draws rainwater from the cistern and generates the necessary pressure in the rainwater pipe 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 is flushed and a pressure drop is thus detected, the pump controller immediately switches the pump on again. As soon as all tapping points are closed and the line pressure rises again, the pump switches off again automatically .
Uninterrupted water supply
If, in a period of dry weather , the Rainwater tank should become empty, the system automatically switches to mains water operation, with the float switch in the cistern serving as a sensor . If necessary, the SIGMA rainwater unit can also be switched manually to mains water mode . In addition, a small intermediate storage tank in the rainwater unit ensures an uninterrupted water supply in the rainwater pipe network at all times.
Up to 97 % more economical than other rainwater harvesting systems in standby mode.
The controls of many rainwater units have a power consumption of up to 15 watts in standby mode , which accounts for most of the energy required for rainwater utilisation. With the efficient ZETA 02 pump controller, developed in cooperation with the Technical University of Hesse, THM, 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 works
Matching accessory parts
Other rainwater works
Article number
| SIGMA 3 | without level indicator | RZ 1003 |
| SIGMA 4 | without level indicator | RZ 1004 |
Technical data
| SIGMA 3 | SIGMA 4 | ||
|---|---|---|---|
| Equipment | |||
| Pump in wall unit | Aspri Plus 15/3 | Aspri Plus 15/4 | |
| Pump controller | Zeta 02 | ||
| Hydraulic data | |||
| Operating pressure | 3,3 bar | 4,4 bar | |
| Flow rate max | 65 l/min | 65 l/min | |
| Switch-on pressure of the rainwater unit | 1.5 bar | ||
| min. Switch-off pressure of the rainwater unit | 2.2 bar | ||
| Maximum start-up frequency | 20 times per hour | ||
| Pumped media | Filtered rainwater, mains water (no sand content) | ||
| Intermediate storage capacity | 9l | ||
| Electrical data | |||
| Max power consumption | 608W | 808W | |
| Power consumption standby | < 0,2 W | ||
| Mains connection | 230 V, 50 Hz, single-phase | ||
| Rated current | 2,7 A | 3,5 A | |
| SIGMA mains cable (pump controller) | 1.4 m, with plug (3 x 1 mm²) | ||
| Float switch | 15 m, free cable end (3 x 1 mm²) | ||
| Water connections of the rainwater unit | |||
| Inlet from cistern | 1" outside thread | ||
| Output to the consumers | 1" outside thread | ||
| mains water connection | ³/₄" outside thread | ||
| Noise emission | |||
| Rainwater operation | 45 dB (A) | 47 dB (A) | |
| Mains water mode | 63 dB (A) | 63 dB (A) | |
| Ambient conditions | |||
| Max. water temperature | 35° C | ||
| max. ambient temperature | 40° C | ||
| Dimensions | |||
| Wall unit (width x depth x height) | 500 mm x 315 mm x 510 mm |