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A complete guide to rainwater tank installation

Is installing a rainwater tank something you’ve always wanted but never gotten around to? Rainwater is a valuable natural resource that can help residents reduce their water bills by providing an alternative supply for domestic usages, such as gardening, flushing toilets, bathing, laundry, maintaining a green garden, composting and more. 

Before you get started, it’s important to note that different types of rainwater tanks can be suitable for different needs. Understanding the various options, such as types, materials, and the placement of your tank, will help ensure you choose one that aligns with your needs.

To help you better understand the benefits, usage, and how they work, we have put together a complete guide to rainwater tanks.

The benefits 

A well-maintained and professionally installed rainwater tank can come with an array of benefits, including: 

Reduce your water bill – Even if you only use your water tank to water your garden, you can still save significant amounts on your water bill compared to using the main water supply.

Access water during restrictions – During water restrictions, you can use rainwater to maintain the plants, grass and trees on your property.

Help the environment – By collecting and reusing rainwater, you are actively helping the environment and reducing the demand on our water supply.

Less erosion and flooding – Collecting rainwater can diminish erosion in the garden and around downspouts, which can help control stormwater run-off, and reduce flooding in certain areas. 

Helping wildlife – A rainwater tank can help sustain food supplies for native birds and animals during a drought. 

Rainwater usage

Unfiltered rainwater can be used for watering gardens, washing your car, flushing the toilet, and firefighting.

It is recommended that you install a filter should you wish to use rainwater in your

dishwasher, washing machine, swimming pool and spa.

How it works

A rainwater tank system has several components in addition to the tank itself. These include:

  • A roof that is made of material that won’t contaminate your water supply;
  • Leaf and gutter guards;
  • A leaf-shedding rain head;
  • A strainer basket at the top of your tank;
  • A first flush diverter, pump and switch-over controller.

When water is needed within the house, a pump assists in moving the water from

the tank through a filter and into the appliance outlet. When the tank is empty, the

system will switch to mains water, so the supply is not interrupted. 

Avoiding health risks 

If not adequately maintained, rainwater tanks can pose a health risk. Gutter guards, leaf-shedding rain heads and strainer baskets need to be regularly maintained to avoid them becoming damaged. If damaged, animal faeces and other contaminants can wash straight into your tank from your roof. As these contaminants sit in the water, bacteria and microbes can breed, resulting in gastro for those who consume it. Plus, if mosquitoes creep into the water, they will breed and spread infectious diseases.

Maintaining your rainwater system

Almost all issues with contaminated rainwater can be prevented with proper maintenance. On a monthly basis, it is essential to check the leaf guards, leaf shedding heads, strainer baskets, and inlet screens on the top of your tank. Cleaning your gutter and pipes at least once a year, and cleaning the sediment out of the bottom of your tank every 3- 5 years will help maintain your tank.


Rainwater tanks are an excellent way to contribute positively to the environment, reduce water waste, and save money. Even if you install a tank for the sole purpose of watering your garden, you can still end up saving thousands of dollars in water bills! 

To discuss your needs and determine if a rainwater tank is the perfect fit your home, get in touch with our team on 02 9521 8197.