How much can I save with a rainwater harvesting tank?

For the past decade or so, droughts have become increasingly frequent, coupled with longer heatwaves.

At the same time, more than half of the water we use does not require drinking water: watering our garden, washing our car, feeding our toilets, etc.

To remain autonomous on this precious resource while making an ecological gesture, you are thinking of installing a rainwater recovery tank.

Neverthless, the cost of a complete kit for a garden is a significant investment. And who says investment also says return on investment.

So let's help you find out how much you can save with a rainwater tank.

The benefits of rainwater harvesting

The financial aspect

From a purely financial point of view, you can consider rainwater harvesting as an investment, profitable in the long run. Your water bill will automatically decrease thanks to the recovery of this rainwater.

200m² of lawn is an annual consumption that can go up to 700 m3/year.

So, on a basis of 3e the m3 (without forcing), this represents 2100e per year, just for the lawn.

The simulator of our partner Graf allows you to make a personalized calculation: need, size of your house and garden, price of the m3 of water, rainfall, etc.

The ecological aspect

From an ecological point of view, rainwater harvesting is essential in order to stop using drinking water to water your garden, wash your exteriors, feed your washing machine and your toilet.

You limit the amount of city water you use, which puts less strain on the city water system.

You should also consider that the tank you install will play a positive role in controlling water runoff.

Last but not least, the water that comes directly from your tank requires much less energy than city water. The water is going to be collected from your roof, it goes through your gutters. A rainwater collector will filter it and direct it to your cistern or tank.

In fact, the latter requires a large quantity to be drawn from the water table, and then to be distributed throughout the network.

Watering your garden with rainwater

Watering your garden with rainwater is a guarantee of using less treated water, with fewer chemicals. With a vegetable garden, this water is ideal for obtaining the "cleanest" fruit and vegetables possible.

Plants appreciate rainwater, which is slightly more acidic and with low mineralization

Benefits generated thanks to rainwater harvesting

Outdoors

The main benefit is without a doubt, that rainwater harvesting can cover 100% of your outdoor needs.

At present, these needs are met by drinking water and yet this is absolutely not necessary. A few examples of the needs you can meet with rainwater:

• Water your flower beds, shrubs, lawn, vegetable garden for free with water without chlorine!
• Clean your terrace, garden furniture, car, bicycles, bay windows, etc.

Indoors

Rainwater harvesting tanks can also substitute for drinking water. Around 40% of your indoor water needs can be covered by installing a filter at the tank outlet, to supply rainwater to your washing machine, dishwasher and toilet.

How much water can be saved with a Garden Kit?

A Garden Kit is a rainwater harvesting tank that is made only for outdoor use. It does not have a treatment pump unlike a Habitat Kit.

Installing your own rainwater harvesting tank for the garden can make up for the use of those 40,000 litres of drinking water per year, and therefore save over 1,700 litres of water over 10 years.