Slimline Water Tanks
Ideal for Australian homes, Polymaster’s slimline water tanks are engineered to fit snugly beside your home, fence, or garage – delivering maximum water storage for the minimum footprint. Available from 600L to 5,000L in 17 Colourbond style colours, with optional garden pump and household pump configurations.
FEATURED SLIMLINE WATER TANKS
Featured Products
POLYMASTER SLIMLINE WATER TANK SOLUTIONS
Browse Our Range of Slimline Water Tanks
Polymaster’s slimline range is available from 600L to 5,000L with a choice of tank only, garden pump system, or household pump configuration. All share the same space-saving design and one-piece poly construction – the only difference is what you need to do with your water once it is collected.
Our slim poly tanks are built for Australian conditions, certified to Australian standards, and available through more than 1,600 agricultural and plumbing stores across Victoria, South Australia, New South Wales, and South East Queensland.
Available Colours
Available Colours
* Product May Vary Slightly. Polymaster will not be held liable for incorrect colour impressions, request your Polymaster colour sample to view colours. Polymaster tank colours represented match COLORBOND steel colours. *COLORBOND® and colour names are registered trademarks of Blue Scope Steel Ltd™.
| Code | Product | Capacity | Length (mm) | Width (mm) | Height (mm) | Outlet Size (mm) | ||
|---|---|---|---|---|---|---|---|---|
 | PSCT600 | 600L Slimline Water Tank | 600L | 1220 | 580 | 1265 | 25 | Download Drawing |
 | PSCT1050 | 1,050L Slimline Water Tank | 1,050L | 1460 | 690 | 1515 | 25 | View Product Download Drawing |
 | PSCT2000 | 2,000L Slimline Water Tank | 2,000L | 2370 | 600 | 2010 | 25 | View Product Download Drawing |
 | PSCT3000 | 3,000L Slimline Water Tank | 3,000L | 2570 | 790 | 2050 | 25 | View Product Download Drawing |
 | PSCT5000 | 5,000L Slimline Water Tank | 5,000L | 3290 | 1020 | 2010 | 25 | View Product Download Drawing |
600L Slimline Water Tank
PSCT600
1,050L Slimline Water Tank
PSCT1050
2,000L Slimline Water Tank
PSCT2000
3,000L Slimline Water Tank
PSCT3000
5,000L Slimline Water Tank
PSCT5000
Not sure which tank is right for your property?
Our team can help you match the right size and configuration to your space and water needs. Call us on 1800 062 064 or use the instant quote tool above.
SLIMLINE WATER TANK APPLICATIONS
Where Can You Install a Slimline Water Tank?
One of the biggest advantages of a slimline poly tank is placement flexibility. Because of the narrow, compact profile, you are not limited to a large open yard. Polymaster’s range is designed to fit into the spaces that round tanks simply cannot.
Down the Side of Your Home
The most popular placement for residential properties. Tucked neatly against a side fence, wall, or garage, a slimline tank blends into your outdoor space without taking up your yard or blocking natural light. With widths starting from just 580mm, our 600L model fits into the tightest of spaces.
Along a Fence Line
For longer properties with a narrow side passage, multiple slimline tanks can be coupled together along a fence line to increase your total holding capacity without increasing your footprint. All Polymaster slimline tanks feature a tank-to-tank coupling connection, making this one of the most flexible water storage solutions available for residential builds.
Under a Deck or Entertaining Area
Low-profile slimline tanks can be installed under decks and entertaining areas where height is restricted but space is available. This is a popular choice with architects and builders on urban infill developments and renovation projects where every square metre counts.
At the Side of a Garage or Shed
Slim enough to sit neatly beside a garage wall, Polymaster slimline tanks are a practical choice for properties where the only available space is along a hard structure. The colour range means the tank can be matched to your home’s cladding or roof for a seamless finish.
Highest Quality and Standards
Every Polymaster slimline water tank is certified, Australian-made and built to handle our climate – so you can have complete confidence in what you are putting beside your home.
Food Grade Polyethylene
Certified to AS/NZS 4020 – the Australian standard for products used in contact with drinking water.
ISO 9001 Quality Management
Polymaster holds ISO 9001 certification – the international standard for quality management systems.
Australian Made
Designed, engineered, and manufactured right here in Australia – built for our climate and our conditions.
Independently Certified
Certified to AS/NZS 4766:2020 for polyethylene storage tanks.
WHY CHOOSE POLYMASTER
Australian-Made Slimline Water Tanks Built for Australian Living
Polymaster has been supplying Australian homes and developments with quality water storage for over 30 years. Our slimline range is purpose-built for the modern Australian block – engineered to perform in harsh UV conditions, designed to sit unobtrusively beside your home, and certified to the standards that matter.
Every Polymaster slimline tank is manufactured from food-grade polyethylene certified to AS/NZS 4020:2018, certified to AS/NZS 4766:2006, and backed by up to 25 years design life. The one-piece construction means no joins, no seams, and no part lines – just a clean, strong, long-lasting tank that looks as good as it performs.
FEATURE POINTS
Why Choose Polymaster Slimline Water Tanks
There is a lot to consider when choosing a slimline tank. Here is what sets Polymaster apart.
One-Piece Poly Construction
No joins, no seams, no part lines. Manufactured in a single piece for maximum structural strength and long-term leak resistance.
Double Strength UV+ Resin
Our tanks are manufactured with double-strength UV+ resin, giving them ultimate protection against the harsh Australian sun for the long term.
Self-Supporting Roof Design
No support poles required. The self-supporting roof adds structural integrity and keeps the inside of your tank clean and accessible.
Extra Thick Walls
Extra-thick walls for maximum strength – built to handle the demands of Australian weather conditions across a 25-year design life.
Easy Lift Hand Grips
Built in hand grips make positioning and moving your tank easier, particularly useful when installing in tight side access areas.
17 COLOURBOND STYLE COLOURS
Match Your Tank to Your Home
A slimline water tank sits in full view beside your home, fence, or garage – so how it looks matters. Polymaster’s slimline range is available in 17 Colourbond style colours, giving you the flexibility to match your tank to your home’s exterior, roof, fencing, or cladding for a clean, considered finish.
Available Colours
Available Colours
* Product May Vary Slightly. Polymaster will not be held liable for incorrect colour impressions, request your Polymaster colour sample to view colours. Polymaster tank colours represented match COLORBOND steel colours. *COLORBOND® and colour names are registered trademarks of Blue Scope Steel Ltd™.
SLIMLINE TANK SIZING AND COUPLING
How to Choose the Right Slimline Tank Size
Garden and Outdoor Use
For watering lawns, gardens, and outdoor areas, a tank in the 1,050L to 3,000L range is a practical choice for most residential properties. A 1,050L or 2,000L tank paired with a garden pump gives you a reliable, compact setup for regular outdoor watering without taking up significant space.
Household Use - Toilets and Washing Machines
For connecting your tank to your household plumbing for toilet flushing and laundry use, look at a 2,000L to 5,000L tank with a household pump and mains water changeover kit. The changeover kit automatically switches between your rainwater supply and mains water when the tank runs low – so you never have to think about it.
Builders and New Developments
The Polymaster Builder Slimline Tank (2,020L with integrated Hyjet pump) is designed specifically for builders and plumbers working on new residential developments. With fittings on both sides, dual overflow, and flexible hoses that reduce hook-up time to around 10 minutes, it is the fastest and easiest solution for achieving a 6-star energy rating on new builds. Free delivery to the Melbourne metro area.
Linking Multiple Tanks for Greater Capacity
All Polymaster slimline tanks can be coupled to other tanks for even greater volume. If you have a long fence line or side passage and need more than 5,000L of storage, multiple tanks can be linked together without requiring additional plumbing complexity. Talk to our team about the right configuration for your property.
SLIMLINE TANKS IN THE FIELD
DELIVERY AND DISTRIBUTION
Delivery Across Victoria, South Australia, New South Wales, and Queensland
Truck and trailer clearance required is 19 metres long, 5 metres high, and 3.5 metres wide. Check for low branches or powerlines on your access route and ensure your gate and entrance can accommodate a 19m truck and trailer. A flat, clear area of at least 5 metres by 5 metres is required for unloading. Our logistics team will contact you approximately seven days before delivery to confirm your address and access requirements.
WATER TANKS CASE STUDIES
Trusted by Australian Businesses to Deliver These Projects
Polymaster’s slimline water tanks are manufactured to the highest quality standards, hold product certification from an independent testing authority, and are trusted by some of Australia’s most recognised organisations and developers.
Can't Find the Tank You Are Looking For?
Talk to our team. We will help you match the right slimline water tank to your property, space, and water needs – whether it is a single residential tank or a coupled system for a larger development.
MORE WATER TANK SOLUTIONS FROM POLYMASTER
Explore Our Full Range of Water Tank Solutions
Our slimline range is just one part of what Polymaster offers. If you need underground storage, high-capacity above-ground tanks, or a solution for a specific site condition, we have you covered.
Round Water Tanks
Available from 200L to 31,700L, Polymaster’s round poly water tanks are the most versatile above-ground storage solution for rural, residential, and industrial applications across Australia.
View Range
Underground Water Tanks
For properties where above-ground storage is not an option, our underground range offers 3,300L and 5,000L capacity completely out of sight, with the smallest environmental footprint in the industry.
View Range
Retention and Detention Tanks
For civil, stormwater management, and OSD applications, Polymaster’s retention and detention tanks are engineered to council and development specifications.
View Range
FAQs
Frequently Asked Questions
Everything you need to know about Polymaster’s slimline range, from sizing and colours through to maintenance and delivery.
What sizes do Polymaster slimline tanks come in?
Polymaster offers slimline tanks from 600L through to 5,000L, including the 2,020L Builder Tank with an integrated pump and household changeover system for toilets and washing machines. The full range is available in tank-only, garden pump, and household pump configurations.
What colours do Polymaster slimline tanks come in?
All Polymaster slimline tanks are available in 17 Colourbond style colours across our standard and optional colour ranges. These include popular options such as Monument, Ironstone, Woodland Grey, Wilderness, Classic Cream, Paperbark, and more. We recommend requesting a physical colour sample from your local distributor before ordering, as colours may vary slightly from screen representations. COLORBOND is a registered trademark of BlueScope Steel Ltd.
Can I link multiple slimline tanks together?
Yes. All Polymaster slimline tanks feature a tank-to-tank coupling connection, which means multiple tanks can be linked together to increase your total holding capacity without a larger footprint. This is a popular solution for properties with a long fence line or narrow side passage where more than 5,000L of storage is needed.
Are slimline tanks suitable for BASIX or council water storage requirements?
Yes. Polymaster’s slimline tanks are certified to AS/NZS 4766:2006, which is the relevant standard for polyethylene storage tanks. The 3,000L and 5,000L options in particular are commonly specified on new home builds and developments in NSW, VIC, and SA to meet BASIX and local government water storage requirements. Talk to your plumber or builder about the right configuration for your approval.
Do any slimline tanks include a pump for household use?
Yes. All slimline tanks can be supplied with optional pump packages. For outdoor garden use, the garden pump system (GPS range) includes a 40LPM pump with an automatic pressure controller and colour-matched pump cover. For household use, including toilets and washing machines, the household pump system (AP range) includes a submersible pump with pressure control and a mains water changeover kit that automatically switches to town supply when your tank is empty. The Builder Slimline Tank (BSLT2020 range) includes an integrated Hyjet pump in single and multi-storey configurations.
What is the Builder Slimline Tank, and who is it for?
The Builder Slimline Tank (2,020L with Hyjet pump) is designed specifically for builders and plumbers working on new residential developments. It includes fittings on both sides, dual overflow positioned at each end rather than centrally, and flexible hoses that reduce hook-up time to around 10 minutes. It is the most efficient solution for achieving a 6-star energy rating on new builds and is available in single-storey (370W pump) and multi-storey (550W pump) configurations. Free delivery applies to the Melbourne metro area.
Are slimline tanks better than round tanks?
It depends on your situation. Slimline tanks are the better choice when space is limited, when you need to fit a tank along a narrow side passage or fence line, or when aesthetics matter and the tank will be visible from the street or yard. Round tanks generally offer higher capacities, are more cost-effective at larger sizes, and are easier to access for maintenance. For urban residential properties and new builds on smaller blocks, slimline is typically the preferred choice.
What should I keep in mind when buying a slimline water tank?
Consider the available space at your property, including width, length, and height clearances. Think about what you intend to use the water for – garden only, or household use too – as this determines whether you need a garden pump, a household pump, or a tank only. Check your local council or BASIX requirements if you are on a new build or renovation. Consider the colour in context with your home’s exterior, and request a physical colour sample before ordering. Finally, check site access for delivery – particularly for 5,000L models which require lifting equipment on site.
How do I maintain my slimline rainwater tank?
Polymaster recommends periodic checks every 3 to 6 months. Keep your gutters, leaf screens, and inlet strainers clear of debris. Check that the overflow is unobstructed. Flush any settled sediment from the base of the tank every few years, particularly if the tank is used for household purposes. If you have a pump, give it a regular check over and clean or replace filters as needed. For more details, visit our maintenance guidance in the Knowledge Centre.
How long do slimline water tanks last?
Polymaster’s slimline range has a design service life of 25 years and carries a manufacturer’s warranty of up to 7 years (up to 10 years on the Builder Slimline Tank range) when correctly installed. With regular maintenance, many tanks perform well beyond their design life.
Where can I find Polymaster slimline tanks in Australia?
Polymaster slimline tanks are available through more than 1,600 agricultural and plumbing stores across Victoria, South Australia, New South Wales, and South East Queensland – including Melbourne, Adelaide, regional VIC, and the NSW Riverina. Use the store locator on this page to find your nearest stockist, or contact our team directly.
What size slimline tank do I need for my garden?
A few useful rules of thumb: for courtyard pots and herbs, a slimline tank around 1,000L keeps small planters thriving. For a compact veggie patch up to 50 square metres, a 2,000L to 3,000L tank gives you reliable irrigation. For a family lawn and mixed garden beds of 100 square metres or more, look at a 5,000L option. For a more precise figure, use Polymaster’s online water tank calculator, which takes your roof catchment area and postcode rainfall into account.