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Why and when to install a water tank

January 11, 2012 5min read

If you’re building a new home, you’ve probably already considered installing a water tank as there are many benefits for your home, the environment and your wallet! But unless you’re a water tank expert, you’re probably unsure of where to begin. Let’s see if we can get the process flowing for you (ha, like what we did there?).

If you want access to your own natural rainwater, installing a water tank for your new home is a must.

It’s not a bad idea – why pay for water from the Council mains supply when you can harvest it for free at home?

The Victorian Government estimates that the average annual water use in a four person, five star energy rated home in Melbourne is about 240 kilolitres (kl) per year.

A water tank:

  • Will help reduce your household water costs, especially if you connect your rainwater tank to your washing machine and toilet
  • Will eliminate concerns about water restrictions and supply your household with access to water to use for your private needs such as filling your pool, washing your car and watering your gardens
  • Qualify for government rebates, so your return on investment is even higher.

Picking your tank size:

The Victorian Government states that in Melbourne, a rainwater tank of 2,000 litres fed from 50 square metres of roof and connected to the toilet would save about 28 kl of mains water per year.

A larger tank of 4,500 litres fed from 100 square metres of roof would have the capacity to supply the washing machine and the toilet, saving a household up to 56 kl a year.

You would need a larger tank again if you wanted to have enough rainwater supply for your toilet, washing machine and gardening.

Water costs work on different tariffs and tiers so it’s best to speak to your water supplier to find out how much each kl is costing you.

Your builder can help you choose the right tank for your needs and many, including Porter Davis, can organise installation during your build so that the water tank is an integrated part of your land design.

You can read more water tank information and tips on the Victorian Department of Sustainability and Environment website.