Rainwater pumps
Pumps for rainwater utilisation

Rainwater utilisation
thanks to reliable pumps

Rainwater pumps take on the task of extracting water from a cistern and transporting it at the right pressure to various points in the house or garden.

They enable efficient and sustainable water utilisation in the home and garden. WISY pumps reliably transport collected water from a cistern or rainwater barrel to points of use and help to reduce the consumption of mains water.

Non-return valve for suction pumps

The suction line must always remain filled in order to be able to draw in water. A non-return valve is used here to prevent water from flowing out of the pipe back into the cistern when the pump is switched off. This ensures that there is always a column of water in the suction hose. A special suction hose must be used as the suction line, which does not contract under negative pressure.

The suction pump for rainwater utilisation has the advantage that it is easier to access than a submersible pump. When installed indoors, a suction pump should be equipped with flexible connection lines and rubber feet to minimise noise.

Submersible pump
as a cistern pump

Submersible pumps, also known as submersible pressure pumps, are located under water in the rainwater storage tank. They do not require special suction pipes, as the rainwater flows to them without pressure via a water intake floating below the water surface.

A submersible pump in the cistern cannot be heard in the house. If necessary, the cistern pump can be easily lifted out of the cistern by means of a mounted suspension cable. A durable seal ensures that no water can reach the power connection. A floating suction filter for water pumps should be added for drawing water from an underground rainwater cistern.

Garden pumps with control unit
for rain barrel or cistern

A garden irrigation pump is particularly suitable for simple and uncomplicated watering in the garden. It is designed for clear water, making it ideal for using filtered rainwater.

For irrigation with rainwater, the garden pump ideally has an integrated control unit. This enables it to recognise the water requirement when, for example, a lawn sprinkler is connected or an irrigation spray is opened. The garden pump switches on automatically until the water extraction is complete.

Integrated dry-running protection protects the garden pump against damage if there is no water in the cistern.

Feed pumps
for rainwater

A feed pump is primarily used to transport liquids. Pressure build-up or overcoming a height difference play a subordinate role. Generating a large volume flow is the core function of a feed pump. They extract the rainwater without pressure and feed it for further use.

Pressure and volume flow
in context

Pressure and the volume of water delivered by a rainwater pump are interrelated. The higher the flow rate, the lower the achievable pressure and vice versa. This correlation results from the increasing flow resistance in the pipe system as the flow rate increases.

In practice, this means that the water volume is low at maximum delivery head, while the pressure drops accordingly at high flow rates. Each pump has a characteristic curve that illustrates this relationship.

In order to select the right pump, it is therefore good to know the maximum amount of water required and at what pressure.

A centrifugal pump
in detail

Centrifugal pumps work by rotating an impeller that spins water from the centre outwards, thereby building up pressure. WISY uses single or multi-stage centrifugal pumps: In multi-stage pumps, the water is pumped in several stages through a series of impellers and impellers connected in series. This design increases the pressure gradually with each stage, allowing water to be pumped over greater distances and heights.

Centrifugal pumps consist of two main parts - an electric part and a hydraulic part. The electric part consists of an electric motor, while in the hydraulic part the water is pumped with the help of fixed guide and rotating impellers. Centrifugal pumps are ideal for rainwater utilisation in the home and garden.

Suitable
Suction filter

The easy installation of a floating suction filter also protects the pumps from abrasive substances such as fine sand particles or sediment in the water. Floating filters that extract the rainwater in the optimum area or fixed intake filters that are directly connected to a submersible pump can be considered.

Control unit with
efficient automatic switch

Rainwater pumps are often part of an irrigation system and a component of all rainwater systems. In combination with our ZETA 02 automatic switch, the power consumption in standby mode for pump control is reduced by up to 97% compared to other automatic switches.

Strengths and
areas of application

WISY pump systems offer high energy efficiency and reliability. Each pump is customised for a specific use: While the AspriPlus, as a self-priming suction pump, is particularly suitable for domestic installations, the Provedo pump offers a high delivery volume when large quantities of water need to be pumped over small differences in height. The Multigo, with its multi-stage design, ensures constant water delivery over long distances and is ideal for supplying toilets and washing machines with rainwater in the home. In the garden, the Beta pump is an ideal solution as it is robust and easy to operate.

WISY offers cistern pumps, garden pumps for rainwater barrels or pumps for your above-ground rainwater tank. In addition to rainwater pumps, you can also obtain customised sets for pumping water, which are designed both for the garden and for rainwater use in the home.

Are you looking for rainwater pumps with control and automatic mains water feed should the rainwater tank ever be empty? Then take a look at our rainwater units!