Rainwater tanks

There is a range of water tanks available in Australia and in this drought prone country it’s wise to get a water tank installed, as part of your eco kit home.

Before buying a rainwater tank find out:

  • how much rainfall you get on average in your location. To find out take a look at the Australian Rainfall Analysis Map
  • how much water do you use at the moment (look at your water bill)
  • how big is the space you have for a tank

It’s a good idea to purchase a tank that can hold at least four times the weekly amount of water that you use right now. The bigger the tank the better! Make sure there’s a plan for when the tank overflows.
The size of your roof determines how much water you’ll collect; 1 millimetre of rainfall results in 1 litre of water per square meter of roof.
A large water tank might need council approval.

Rainwater tanks materials

We have a choice of different materials such as:

steel rainwater tanks
  • Stainless steel, the most popular rainwater tanks are made of stainless steel as they are:
    • strong and durable
    • non-flammable and won’t emit toxic fumes during a fire
    • 100% recyclable
    • available in many shapes, sizes and colours
    • UV rays can’t get in which prevents algae growth
  • Concrete, the heaviest material for your rain water tank which is:
    • strong and suitable for underground installation
    • can crack when reinforcing steel corrodes
    • excess lime from the concrete can leak into the water, creating a high Ph. Ph is a measure of acidity/basicness in water with a range from 0 to 14. For water to be healthy it should have a Ph between 6 and 8
    • non-recyclable
    • costs a lot of energy to produce
  • Fibreglass, the most expensive rainwater tanks are made of fibreglass which:
    • can let light in, therefore algae growth is a risk
    • cheaper quality can be prone to cracking as they are relatively thin and light
    • non-recyclable
    • suitable for underground installation
  • Polyethylene, the cheapest material for water tanks which is:
    • strong and light, easy to install
    • made of oil therefore unsustainable
    • will melt in a bush fire, emitting toxic fumes
    • a health hazard when BPA is used. BPA stands for Bisphenol A, a chemical which can harm reproductive health in children and is linked to breast and prostate cancers