Water Tanks for Gardens

Pioneer Water Tanks - The best water tanks for gardens

Rainwater Tanks for Your Garden

Wanting to have more freedom to water the garden is one of the most common reasons for installing a rainwater tank – whether you live in rural areas or the suburbs – and Pioneer Water Tanks is here to help with all of your rainwater harvesting needs.

When it comes to people who have no access to mains water supply, having a little extra water storage than you need to cover your family’s water use can allow you to maintain a lush garden or veggie patch, and keep your home looking green and inviting.

Pioneer Water Tanks have been designing, manufacturing and installing large steel water tanks for more than 30 years, and our network of more than 50 dealers Australia wide are experts when it comes to water tanks for your garden and your home.

If you need a water tank for your home, or a small water tank for your garden, speak to one of our knowledgeable staff members today, who will be more than happy to assist you with any questions you may have, and help you on the way to meeting your water storage needs.


Pioneer Water Tanks have provided a service for Western Australia since 1988. Our high quality Australian-made water tanks will provide the long-term water security you’re looking for.

The best water tanks for gardens

The different types of garden water tanks

There are many different types of rainwater tanks and other water tanks on the market today, with the standard above ground water tank including steel tanks and poly water tanks that can be further broken down into models like slimline tanks, large liner tanks, round poly tanks and rain barrels, and then underground tanks or bladder tanks which can stay hidden under decks or soil in order to save space.

As well as rainwater tanks, many people also install greywater tanks for their gardens, saving the water from their bathroom or laundry in a separate water storage system, and allowing them to reuse it in the gardens and on their lawns, as well as for flushing toilets.

These tanks all have their advantages and disadvantages, and what you need to use your water tank for will determine which of these rainwater storage solutions best suits your needs. 

old garden shed with rain water collection tank in a rain barrel style of plastic tank

How to pick the right size garden water tank

The right size tank for your garden will be determined by a number of factors, but the main one being; how much water supply do you need?

If the water tank is for primarily garden use, this will be determined by how large your garden is, how much you need to get around water restrictions, and how long your dry spells are throughout the year where you are unable to harvest additional rainfall.

If you need a water tank to cover all tap water and drinking water in your home, as well as to water a garden on top of that; you will likely need a large steel water tank, and will need to calculate how much water your family uses, as well as how much you will need on top of that to keep your garden alive.


an old galvanised steel slimline water tank small water tank for gardens or rainwater tank for drinking

How to choose the right water tank for your garden

The first two things you want to look into, are the average annual rainfall on your property, and the amount of roof harvesting area you have available. This will let you know how much water you can harvest annually. If you don’t have enough roof space you can look into smart water savers for your tank, to include your tank roof in your water harvesting.

Next you want to look into how much water you need to use. You want to go off of a minimum of 30,000L + 30,000L of storage per person, and an additional 5,000L – 10,000L for your garden. 

So for a house with four people in it, with a garden; you would want a steel liner tank with a minimum of 160,000L of storage. For just the garden alone, you would look at a 5,000L – 10,000L poly water tank or slimline tank.

a top down view of an australian rural home on a farm with multiple poly water tanks and solar power

People with water tanks garden more efficiently

Having a water tank for your garden – even if you have access to mains water supply – gives you freedom when it comes to your water usage, and can help you keep your water bill down, particularly as prices for water and other utilities continue to rise.

Much of the stormwater runoff you are harvesting will soak into underground water supply, and have run into rivers or oceans by the time summer comes around, so realistically the rain water you harvest from your roof is better off being stored as fresh water with a water quality that is better for watering your garden than standard tap water. Some studies have shown that rainwater is significantly better for your garden, as it comes in an unfiltered form, without the sodium, calcium or magnesium found in tap water, making it higher in nitrogen and with a higher pH level, which is not only better for your plants, but helps absorb carbon dioxide.

If you do live on a rural property, the dry summer months can bring with them a lot of brown and dry land, with plants and garden beds dying off with the grasses across the environment. Having a water tank for your garden can help you to maintain your plants and garden beds in a healthy green state, keeping your home inviting, lush and green, which can also help improve your mood, and make your home look more aesthetically pleasing.

How to install a water tank for your garden

If you’re installing a slimline water tank or poly water tank for your garden, it is as easy as connecting your new rainwater tank – likely placed on a concrete slab or prepared sand – to your downpipes, and connecting the reticulation to the outlet valve on this newly installed rainwater tank and disconnecting it from your mains water.

For a large steel rainwater tank – like the ones offered by Pioneer Water Tanks – these are installed by an experienced installer, so that your water tank complies with its warranty conditions. Pioneer Water Tanks has the Pioneer Dealer Direct® Network, made up of more than 50 authorised dealers across Australia, with experience in installing Pioneer Water Tanks  for customers all across Australia.

To correctly install your water tank, first you must install a correctly sized sand pad and aggregate so that the dealer can install the rainwater tank without any trouble. Once the tank itself is installed, you will need to have it plumbed into your home and gardens. Many of our dealers are also licenced plumbers, and can perform this for you as an additional service. For more information on water tank installation, head here.

How to properly maintain a water tank garden

Your water tank, once installed shouldn’t require much maintenance, if any. For steel water tanks you will want to change the anodes when recommended by your manufacturer, and plastic tanks it is important to keep an eye on the plastic and make sure it isn’t breaking down in the sun. Different manufacturers will have different advice when it comes to taking care of their rainwater tanks, so refer to your owner’s manual for more information.

If your water tank is being used for drinking water and showering, you may want to clean it occasionally. This typically isn’t something that requires frequent attention, however it should be carried out by someone who knows what they are doing, and you should never enter your water tank unless you absolutely have to.

Water Storage for the garden and your home

Pioneer Water Tanks have a range of products and accessories that make water supply for your garden and home  simple, so that you don’t have to worry about it once your water tank has been installed. These tanks also come in a variety of colours and sizes, so that you don’t just achieve the water tank capacity you need for your family and garden, but also an aesthetically pleasing rainwater tank that matches your home.

For more than 30 years, Pioneer Water Tanks have been installing large water tanks that Australians can rely on, and this guarantee comes in the form of our 20/20 warranty – that’s a 20 year conditional structural warranty and a 20 year conditional warranty against water leakage.

If you’re interested in a water tank to save on water bills in your garden, or to provide water storage for your garden and family home; get in touch with us on 1800 999 599, or by simply clicking here to request a quote for a water tank today, and one of our dealers will be in touch with your customised water tank pricing.

Frequently Asked Questions

What size water tank do I need for my garden?

If you are only looking for a water tank for your garden, then you may be looking for a slimline tank or a rain barrel. If you need a water tank for your garden in addition to one for your home, one of the benefits of a steel water tank is that you can simply purchase the size up, and if you need additional rainwater catchment, Pioneer offers the Smart Water Savers to help you catch rainwater from your tank roof.

Simply calculate how much water you are planning on using in your garden, and add this to the size of the rainwater tank you were planning on purchasing for your home or farm.

Which water tank is best for home use?

This will entirely depend on what you are using it for, as different requirements for space and size will call for different water storage solutions – as will if you will be drinking the rainwater from your water tank.

For smaller tanks, poly is more affordable and comes in shapes that can conveniently fit on suburban blocks, and don’t require a sand pad in the way large steel tanks do. However when it comes to longevity, fire protection and sustainability, steel rainwater tanks win hands down. They have been proven to last over 30 years, are the best rated water storage for fire protection, and the steel sheets and trusses are fully recyclable at the end of their service life.

Can you use a water tank without a pump?

This depends on where the water tank is situated. Above ground tanks, situated no more than the recommended 50cm below the gutter for every meter from the home they are, shouldn’t need a pump as the weight of the water inside the tank is typically enough to gravity feed the water back into the home. 

For smaller tanks, rainwater storage located further from the home, or when tanks are close to empty; a pump may be required, however in most residential or domestic settings, your water tank will not require a pump in order to function optimally, and achieve adequate water pressure.

How often will the water tank need to be replaced?

Pioneer Water Tanks are made from strong Australian BlueScope steel, and designed specifically for water storage, so in the best case scenario your Pioneer Water Tank will never need to be replaced. Most of the tanks installed in Pioneer’s first year back in 1988 still stand today, and all Pioneer Water Tanks come with a 20 year conditional structural warranty, and 20 year conditional warranty against water leakage.

So worst case scenario, you will need to replace your water tank every 20-30 years. Best case scenario, you won’t have to replace it at all.