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How to buy the best pump for your rainwater tank

A guide to flow rates, pressure, outlets and installation.

rainwater tank pump and rainwater tank

If you've installed a rainwater tank or you're shopping around for one, well done – you're doing your bit to help the environment. But catching the water is only half the battle. Now you have to send the precious drops around the house, and for that you need a water pump.

First steps in deciding on your rainwater tank pump

The first step is to decide what you want your pump to do, as this will determine how powerful the pump will need to be as well as any extra features the pump will need to direct the water where you want it to go.

A good flow rate (in litres of water per minute) will not only help you water your garden quickly – it's also an important factor in getting your flow to work at a reasonable level throughout the home. A good domestic pump should deliver at least 20L a minute which is around the same rate as a typical domestic town water tap; but most can manage more than this. The more water outlets the pump needs to service, the greater its maximum flow rate needs to be.

Water pressure from the pump is also an important factor – even more so if you're using the pump to power your domestic water supply rather than simply watering the garden. (Nobody likes a dribbly shower!)

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