Choosing the Right Pressure Pump for Your Rainwater Tank

Installing a tank water is a small step that you could take to become self-reliant no matter what size it is. Generally, the larger the tank, the more water you can use and collect. If you want to use rainwater to flush toilets and provide laundry water, you need at least a 9,000 L tank. Luckily, it is not uncommon to install 30,000 to 50,000 L tanks.

Choosing the Right Rainwater Tank

When it rains, the rain will fall on your roof. It will then run through the gutter connected to the tank to collect the water. Therefore, the rainwater is filtered before it reaches the tank, which prevents insects, leaves, and other debris from falling into the tank. It can then be distributed to your garden or home for various purposes, such as toilet flushing, watering plants, or washing your car. That is why it can be installed in residential family homes and office and work properties.

Old water tank in the Australian outback. Source: Harry Cunningham.

Pump to Water the Garden

Some of the models are pressure pumps designed to pump mainly garden water. The Wilo-FWJ models are household transfer pumps for potable water, while the others are garden pumps only. These are all 240V electric pumps, and some are displayed with press controls. The press controls start the pump automatically when a tap is turned on. Then it will turn the pump off when the tap is turned off. If no press control is used, then the pump will operate manually. All of these are available with or without the press controller.

Pump for the Hose Water Supply

Generally, household pressure pumps transfer water from the rainwater tank to the house. Adding a Pressure Switch or Pressure Tank set up will automate the system. 

Pump Flow Rate

The number of taps the pump will service will determine how much flow you need. As with all water pumps, you need to know the flow rate and the head. Every pump will have a flow chart with the flow rate and head. If you match these up, then you can select the correct model.

Example flow rate chart from Lowara-e-GS-Series-4 submersible pump. Source:

Rainwater Tank Pump Features and Options

Automatic Pressure Switching

If you like your pump to turn on and off automatically when you turn on the tap, you need to add an Automatic Pressure Device to the pump. This is needed if you’re connecting to indoor plumbing. Pumps without a Pressure Switch are switched on or off manually.

Run Dry Protection 

Run dry protection feature prevents damage to your pump’s motor if the rainwater tank is empty. Most automatic pressure switch devices have run-dry protection. It is rare to find one that does not have this feature.

Weatherproof Pump

A weatherproof cover and base are needed for the pump. It will protect the pump and plug from the muffle and elements its noise. Don’t connect the pump via an extension cord to an indoor power point. It might not be weatherproof and could be unsafe.

What Does ALPP Provide

When it comes to these water storage solutions, ALPP uses leading technology and is sold by a committed team of sales staff. We find that people who use our systems benefit from experienced staff and support from a skilled supplier network.


At AllAbout Pumps & Pipes, each installation of your choice has a different requirement of specific pressure to deliver the desired flow over a specified distance. The use of tank water products will help you do the work easier. Our team will equip you with the best products and trusted partners. 

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