012 942 9537 info@k-plumbing.co.za

Imagine strolling through your well irrigated garden on a beautiful summer’s day with the peace of mind that you can enjoy the peace and tranquillity without an excessive water bill. Sounds impossible? Well it isn’t!

In our previous blog post we told you all about the benefits of rainwater harvesting, now, we’ll show you how…

How to install a rainwater tank

1. Choose the correct tank

You will need to calculate the size of the tank to harvest rainwater from your roof. For roof sizes ranging from 50 to 100 metres squared, a tank ranging from 750 to 2 200 litres will suffice. Bigger roofs, ranging from 200 to 400 metres squared, will need a bigger tank, ranging from 2 500 to 10 000 litres.

2. Pick a spot

The best place is near a primary downpipe, on the lower side of your house, to allow gravity to direct the rain through the gutters into the tank. Other factors to consider are space and aesthetics.

3. Lay the slab

  • Water tanks must be installed on a solid, level and smooth surface.
  • Your base must be at least 150 mm thick.
  • Place your water tank on the slab, keeping the footings in place to make sure it’s securely positioned.
  • Use the table below to determine the right slab dimensions for your tank size.
Tank Diameter
750 litres 860 mm
1 500 litres 1 510 mm
2 200 litres 1 520 mm
2 500 litres 1 520 mm
5 000 litres 1 930 mm

10 000 litres

2 300 mm


4. Connect the pipes

The last step is to take care of the plumbing. Connect the downpipe from the gutter to the tank by cutting a hole in the top of the tank and installing the fittings. Make sure there are no gaps that allow insects, dust and other debris to get in.

In some cases, you’ll need to fit mesh under the tank lid to help keep out smaller debris and insects, although some JoJo tanks have these already built in.

Take Note:

If you want to connect your tank to your house, you will need a pump and the knowledge of how to install it. Furthermore, a non-return valve is also required to protect the municipal domestic water system from possible pollution by tank water. Please call on the services of one of our knowledgeable plumbers to assist you.

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