The Benefits of Installing a Water Tank with Your Shed

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Rainwater tanks serve as a collection point for stormwater runoff from impervious surfaces such as roofs, thereby minimising the volume that flows into our waterways. These tanks are equipped with an overflow mechanism that redirects excess water into the stormwater drainage system once the tank is full.

If you have a shed that isn’t collecting water, it might pay to consider installing a water storage solution so you can make use of all that extra surface area on your shed’s roof. The natural rainfall can provide many benefits to your home, including watering your garden, providing fresh drinking water, and reusing rainwater throughout your house (particularly for an off-grid home scenario).

How much water can I expect my roof to collect?

If you’re seeking ways to enhance the sustainability of your home or planning to construct one, incorporating a rainwater tank to attain a 6-star rating can be an excellent option. You might find the following information useful to estimate the amount of rainwater you can harvest from your roof.

In Victoria, Australia, a typical roof will collect around 130,000 litres of water each year. But bear in mind that some months rain more than others and you’re not going to need to store 130,000L of water all at once. That being said, it’s very dependent on the region in which you live and the local rainfall. Lawn and garden watering will likely consume the largest amount of your stored water. If you’re a keen gardener with a sizeable lawn, you’ll need to factor this into your tank size selection, and also how many people are in your household. Based on this information, a lot of family households in Victoria should be thinking in the range of 10,000 – 20,000L of water storage for a solid supply in residential use.

What water tank to choose?

Polymaster is an Australian-owned and operated company that has been manufacturing water tanks for over 25 years. They offer a wide range of water tanks in various sizes, shapes, and colours to suit different requirements and preferences.


  • Extra thick walls that are BPA free
    The extra thick walls in Polymaster water tanks ensure strength and durability while being BPA-free for safe water storage.
  • UV+ Double Strength
    Exclusive UV+ double-strength resin gives the best protection against Australia’s harsh sun.
  • Food Grade
    Tanks are made from food-grade polyethene and are certified to AS/NZS4020, the Australian Standard for drinking water.
  • Australian Made
    Family-owned and operated in Australia since 1994.
  • Quality Assurance
    Polymaster only produces quality products and services, certifying the international standard for quality management ISO9001.
  • Fittings Standard
    Rainwater tanks come standard with fittings. We can assist with what fittings come with the tank model you are interested in.
  • Warranty
    All Polymaster water tanks come with a comprehensive warranty to give you peace of mind, with a 20-year warranty against corrosion and a 10-year warranty against faulty workmanship.

Underground vs Above-ground water tanks

Above-ground water tanks

Above-ground water tanks are a popular solution because they’re faster and easier to install, which means the overall project cost is lower by the time you are benefitting from natural rainfall collection and use.

  • Given there is no need to excavate (with the exception of levelling) for an above-ground water tank, it makes for a cleaner worksite that is faster and cheaper overall. Understandably, this is a very appealing option.
  • Depending on elevations and surroundings, above-ground tanks can have the option to provide a gravity-fed water line to the required water use point, such as a tap. This means there are potentially fewer parts to buy and maintain, such as a water pump, which reduces the overall cost and maintenance work required for your water tank.
  • Whilst access points can be installed for below-ground water tanks, above-ground tanks are inherently easier to access and inspect given their exposed position.
  • Whilst there are many benefits of above-ground tanks, there is a downside in that they can be exposed to UV rays which can cause degradation over time. That being said, most quality tanks are manufactured with UV protection to mitigate this very risk, and there are other measures that you can put in place such as tree canopies and shade options to protect your asset.

With the increasing population and urbanisation, the availability of space has become a major issue, especially in urban areas. This has led architects and builders to explore innovative solutions to maximize the available space. One such solution gaining popularity is installing an underground water tank.

Underground water tanks

  • Underground water tanks not only allow homeowners to utilise the space more efficiently, but also promote eco-friendliness by capturing and harvesting rainwater. These tanks can be placed under paved traffic areas, driveways, garden beds, or lawns, providing more green space or parking areas above them. The result is not only aesthetically pleasing but also a practical solution to space management in urban areas.
  • Underground water tanks have the smallest environmental footprint in the industry, which makes them a sustainable solution. By harvesting rainwater, homeowners can reduce their reliance on the municipal water supply, which in turn saves on water bills and conserves the environment.
  • Polymaster underground rainwater tanks are an excellent example of how these tanks can maximize space utilisation while promoting eco-friendliness. These tanks provide the maximum capacity for the minimum square metreage, making them an efficient and cost-effective solution.

What are the benefits of Polymaster water tanks?

Water scarcity is a growing concern, and having a reliable water storage solution is becoming increasingly important. With a plethora of water tanks available in the market, it can be overwhelming to choose the right one. However, if you’re looking for a durable, practical, and cost-effective solution, Polymaster water tanks should be at the top of your list. Polymaster water tanks are becoming more and more popular due to their numerous benefits.

  • Durability
    Polymaster water tanks are a great long-term investment and can last for more than 20 years with proper care and maintenance. They are equipped with UV stabilisers to prevent deterioration due to sun exposure. The tanks are built to withstand harsh weather conditions and can even outlast you.
  • Easy Installation
    Polymaster water tanks are lightweight and easy to install, making the process quick and effortless. You can set them up anywhere you want, and moving them to a different location is a breeze. You don’t need any special tools or equipment, making it a hassle-free experience.
  • Maintenance
    Polymaster water tanks are easier to maintain than other tank materials like steel or fibreglass. You can install a self-cleaning system that removes debris whenever the tank is full. Polymaster tanks are also rust-resistant, eliminating the need for extra care. They are also more affordable than other materials, making them a practical choice.
  • Variety
    Polymaster water tanks offer a wide range of options to choose from, including different sizes, shapes, and colours. They can be moulded into any shape, making them perfect for your preferences. The tanks are constructed in one piece with no seams, making them leak-resistant. You can find your preferred colour that suits your home’s aesthetic.

How we can help you?

At All Sheds we take the stress out of the process, we offer a complete end-to-end planning, designing, and installing service.

Our team of experts will work with you to understand your needs and recommend a water tank that’s ideally suited to your situation. We believe that every customer deserves a bespoke solution that’s tailored to their unique needs. That’s why we take the time to understand your requirements and recommend a water tank that’s the perfect fit for your property.

What else should I know?

We have compiled loads of information to help you through the process of your shed and water tanks. Here are some other blogs we’ve written that might be of interest.

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What To Consider Before Enquiring About A Shed
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Why Choose An RHS Frame
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