The OPTIMA PLUS rainwater unit combines all the components required for operation in one device. It enables the water to be pumped from the rainwater storage tank over long delivery distances and high delivery heads and feeds it into the rainwater pipe network under pressure.

Itcontrols the entire rainwater system, monitors the filling level of the storage tank and, if necessary, automatically feeds drinking water into the wall-mounted unit.

Dimensions of the Optima Plus wall-mounted unit (in mm): W 500 x H 510 x D 315

Scope of delivery

Wall-mounted appliance in the house:

  • normal-priming, multi-stage centrifugal pump, max. Delivery pressure 4.7 bar
  • Automatic switch Zeta 02, switch-on pressure 1.5 bar with pressure gauge and operating display
  • Automatic drinking water backfeed
  • Operating indicator for drinking water operation
  • Cover, wall bracket
  • Labelling set

Submersible pump in the cistern:
  • Multigo 205 multi-stage submersible pressure pump, max. Delivery pressure 4.7 bar with 3.5 m connection cable, 1" nozzle with non-return valve on pressure side, 3 m suspension cable
  • Base plate 22 cm x 22 cm for Multigo, made of stainless steel
  • Float switch with 3.5 m connection cable, with switch lever and clamp, made of stainless steel
  • IP 68 terminal box, pre-wired, and optionally with 25 m or 50 m cable extension (4-wire) with IP 68 plug and coupling
  • Floating suction fine filter, made of stainless steel, mesh size 0.3 mm, with 0.75 m highly flexible suction hose

The installation and operating instructions for this product are only provided in German and English. By purchasing this product, you declare your agreement with this.

0 of 0 reviews

Leave a review!

Share your experiences with other customers.

The payment is uncomplicated in our store! You can find detailed info about payment and shipping here. We offer the following payment methods:

Pay online PayPal BLIK iDEAL Multibanco OXXO Trustly Prepayment

Worldwide shipping


Once your order has been placed, you will receive a confirmation email informing you that our shipping team has received your order. Once your order has been processed, you will receive an email notification with your tracking information. Shipping costs will not be refunded in the event of a return. We ship with:

Parcel shipping Pallet delivery Delivery by forwarding agent Delivery by WISY AG

Up to 97 % more economical in standby than other rainwater units

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 Central Hesse, the standby consumption is reduced to less than 0.2 wat ts. This means energy savings of up to 97 % compared to conventional rainwater units. The ZETA 02 is included as standard in the OPTIMA PLUS rainwater units.

Uninterruptible water supply

During a longer dry period , the system automatically switches to mains water mode, with the float switch in the cistern serving as a sensor . If necessary, the OPTIMA PLUS 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.

Pump logic and flow rate

The OPTIMA PLUS has two pumps: a powerful submersible pump in the cistern and a centrifugal pump in the rainwater unit. Depending on the operating mode, only one of the two is running at any one time. In rainwater mode, the submersible pump in the cistern delivers up to 60 litres per minute to the tapping points, while the pump in the rainwater unit is at rest. The powerful submersible pump also enables use with longer supply lines between the cistern and rainwater unit, with distances of more than 25 m being possible. In top up mode the submersible pump in the cistern switches off and the centrifugal pump in the wall-mounted unit takes over.

Matching accessories

Cistern connection sets for rainwater units
PE connectors
PE connectors
Variants from €19.04*
Suction and pressure hoses
Suction and pressure hoses
Variants from €11.90*
Wall bushing
Wall bushing

Other rainwater works

Rainwater unit Sigma 3 Rainwater unit Sigma 3
Multimat rainwater unit Multimat rainwater unit
Rainwater unit Optima 4 Rainwater unit Optima 4
Rainwater unit Maxima 205 Rainwater unit Maxima 205

Article number

OptimaPlus RW 9800

Technical data

Pump inside of the rainwater unit Horizontal centrifugal pump
Submersible pump in the cistern Multigo 205
Pump controller ZETA 02
Electrical parameters
Power consumption centrifugal pump (max./nom.) 800 W / 550 W
Power consumption submersible pump (max./nom.) 1000 W / 600 W
Power consumption stand-by / standby mode < 0,2 W
Mains connection 230 V, 50 Hz, single-phase
Max. permissible rated current 8 A
Mains connection cable rainwater unit (wall unit) 1.5 m (3 x 1.0 mm²)
Submersible pump connection cable 25 m (4 x 1.5 mm²)
Protection class against environmental influences
Submersible pump IP 68
Water connections of the rainwater unit
Cistern connection 1" outside thread
mains water connection ³/₄" outside thread
Output to consumers 1" outside thread
Water connections of the submersible pump
Suction side connection 1" nozzle
Discharge connection 1" nozzle with backflow preventer
Sound pressure level in the house
Rainwater operation no noise emission
mains water operation approx. 63 dB (A)
Pump capacity of entire system
Maximum delivery head 47 m
Maximum flow rate (at 25 m pipe length and 5 m height difference) 10 m
Switch-on pressure for the pumps of the rainwater unit 1.5 bar
Switch-off pressure for the pumps of the rainwater unit approx. 2.2 bar
Max. Operating pressure rainwater operation 4.7 bar
Max. Max. operating pressure mains water operation 4.4 bar
Max. permissible operating pressure 10 bar
mains water connection
Water top up volume (at 3 bar, cross-section ³/₄") approx. 95 l/min
Max. Water temperature 35° C
Wall unit (depth x width x height in mm) 315 x 500 x 510
Submersible pump (without suction filter and stand plate, diameter x height in mm) 140 x 550
Emergency overflow DN 70
Scope of delivery
Rainwater unit (wall-mounted unit with centrifugal pump, ZETA 02 pump controller and intermediate storage tank)
Wall bracket
Multigo 205 submersible pump with floating fine suction filter, suction hose, non-return valve, float switch and 22 m cable extension
Stand plate for submersible pump
Labelling set