Large Water Tanks
Polymaster’s large water tank range covers capacities from 22,500L to 50,000L across corrugated and smooth wall profiles, making it the right size bracket for large rural properties, farms, acreages, and high-demand applications where a consistent and substantial water supply is essential.
FEATURED LARGE WATER TANKS
Featured Products
POLYMASTER LARGE WATER TANK SOLUTIONS
Browse Our Range of Large Water Tanks
Polymaster’s large tank range is available in two profiles.
- The corrugated RWT range suits rural, agricultural, and high-capacity applications with a traditional profile and 20-year warranty.
- The smooth wall PCR range offers a contemporary look with a 15-year warranty.
- Both ranges are manufactured in one piece with no joins, seams, or part lines.
Available in 17 Colourbond style colours, manufactured from food-grade UV-stabilised polyethylene, and certified to Australian Standards, every tank in this range is made in Australia and built to handle the demands of high-volume water storage. 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 | Diameter (mm) | Height (mm) | Inlet Height (mm) | Outlet Size (mm) | ||
|---|---|---|---|---|---|---|---|---|
 | PCR22500 | 22,500L Round Water Tank (Smooth) | 22,500L | 3573 | 2879 | 2,559 | 40 | Download Drawing |
 | RWT22500 | 22,500L Round Water Tank | 22,500L | 3560 | 2800 | 2,470 | 40 | View Product Download Drawing |
 | PCR27000 | 27,000L Round Water Tank (Smooth) | 27,000L | 3573 | 3339 | 3,019 | 40 | Download Drawing |
 | RWT31700 | 31,700L Round Water Tank | 31,700L | 4100 | 3040 | 2,610 | 40 | View Product Download Drawing |
 | RWT50KL | 50,000L Round Water Tank | 50,000L | 4600 | 3440 | 3,290 | 40 | View Product Download Drawing |
22,500L Round Water Tank (Smooth)
PCR22500
22,500L Round Water Tank
RWT22500
27,000L Round Water Tank (Smooth)
PCR27000
31,700L Round Water Tank
RWT31700
50,000L Round Water Tank
RWT50KL
Not sure which tank is right for your property? Our team can help you match the right size and profile to your water storage requirements.
Call us on 1800 062 064
Tanks in the 22,500L to 50,000L range are suited to properties with high or sustained water demand — large farms, rural stations, commercial operations, and properties where rainwater is the sole supply. Here is how to match the right capacity to your situation.
Which Large Water Tank Is Right for Your Property?
LARGE WATER TANK APPLICATIONS
Large Rural Properties and Farms
For properties where rainwater is the primary water supply and mains connection is not available, a tank in the 22,500L to 31,700L range provides enough storage to maintain household supply, stock water, and irrigation through extended dry periods.
At this capacity, multiple tanks can be interconnected to increase storage further without requiring a single large footprint in one location.
Irrigation and Broad-Acre Agricultural Use
Large-scale garden irrigation, market gardens, orchard watering, and pasture management all require consistent high-volume supply.
A 22,500L to 50,000L tank provides the holding capacity needed to buffer against variable rainfall and ensure supply continuity during peak demand periods.
Positioning multiple tanks near irrigation infrastructure reduces pumping distances and system pressure requirements.
Fire Water Storage
For rural properties in designated bushfire-prone areas, a dedicated large-capacity fire water tank is a practical and often required part of a property water management plan.
A 22,500L or larger tank positioned with clear vehicle access and fitted with a suitable pump provides a meaningful onsite reserve for property protection and emergency fire-fighting.
Polymaster tanks in this range are manufactured from UV-stabilised polyethylene and carry a 20-year warranty on the corrugated RWT range.
Commercial and Industrial Water Storage
For commercial properties, construction sites, industrial facilities, and large-scale water management applications, tanks in the 31,700L to 50,000L range provide the volume needed for process water, site amenities, dust suppression, and emergency reserves.
Contact the Polymaster team to discuss your application requirements and site access for delivery of larger tanks.
Highest Quality and Standards
Every Polymaster large water tank is independently certified, Australian-made, and built to handle the demands of high-volume water storage across rural, agricultural, and commercial applications.
Food Grade Polyethylene
Certified to AS/NZS 4020, the Australian standard for products 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 Large Water Tanks Built for High-Volume Demand
Polymaster has been supplying Australian farms, rural properties, and commercial operations with quality water storage for over 30 years.
- Every tank in the large range is manufactured from food-grade UV-stabilised polyethylene, certified to AS/NZS 4020:2018 and AS/NZS 4766:2020, and built to handle the demands of sustained high-volume storage in Australian conditions.
- One-piece construction means no joins, seams, or part lines — critical for a tank that may hold tens of thousands of litres under constant load.
- A self-supporting roof design requires no internal support poles.
- Brass outlets are fitted as standard across the large corrugated range, offering greater corrosion resistance than plastic fittings.
These are not optional upgrades, they are standard across every Polymaster large tank.
FEATURE POINTS
Why Choose Polymaster Large Water Tanks
Here is what sets Polymaster apart from other tank manufacturers in this size range.
One-Piece Construction
No joins, no seams, no part lines. Every Polymaster tank is manufactured in a single piece for maximum structural strength and long-term leak resistance — especially important at high-volume capacities.
Self-Supporting Roof Design
No support poles required. The self-supporting roof adds structural integrity and keeps the interior of your tank clean and accessible for inspection and maintenance.
Brass Outlets as Standard
The large corrugated RWT range includes brass outlets as standard, offering greater corrosion resistance and durability than standard plastic fittings.
Interconnectable for Unlimited Capacity
Every Polymaster large tank can be interconnected with other tanks to increase total holding capacity without limit — a practical solution for properties where demand exceeds what a single tank can supply.
50,000 LITRE WATER TANKS
The 50,000L Mega Tank: Maximum Poly Storage Capacity
The RWT50KL is the largest tank in Polymaster’s round water tank range, providing 50,000 litres of storage in a single poly tank. At 4,600mm diameter and 3,440mm overall height, it is the go-to solution for large farms, rural stations, commercial properties, and high-demand applications where maximum water storage capacity is required from a single tank.
- Manufactured in one piece with no joins, seams, or part lines, the Mega Tank carries a 20-year warranty and is available in 17 Colourbond style colours.
- The 500mm S5 strainer and 90mm overflow are standard fitout.
- Multiple tanks can be interconnected for storage beyond 50,000L.
Delivery and site access for the 50,000L Mega Tank
Due to its size, the RWT50KL requires careful site access planning prior to delivery. Truck and trailer clearance of 19 metres long, 5 metres high, and 3.5 metres wide is required. A clear, flat unloading area of at least 6 metres by 6 metres is recommended for a tank of this diameter. Our logistics team will contact you approximately seven days before delivery to confirm access requirements. Contact us early in the planning process if your site has restricted access.
DELIVERY AND DISTRIBUTION
Delivery Across Victoria, South Australia, New South Wales, and Queensland
Polymaster delivers large water tanks direct to your property or to your nearest local distributor store, with over 1,600 stockists across Victoria, South Australia, New South Wales, and South East Queensland.
Zone 1 – Free Delivery
Our Zone 1 coverage includes Victoria, Southern NSW, South Australia, South East Queensland, and North East NSW.
- Within this zone, free delivery applies for qualifying orders.
- Contact us for current delivery pricing for your tank size and location.
Zone 2 – Delivery Charges Apply
- For locations outside Zone 1, charges apply based on your location.
- Contact our team for a tailored quote.
Preparing Your Site
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. For tanks 22,500L and above, a flat, clear unloading area of at least 6 metres by 6 metres is recommended. Our logistics team will contact you approximately seven days before delivery to confirm your address and access requirements. If your site has restricted access, contact us early in the planning process so we can advise on the best delivery approach.
LARGE TANKS IN THE FIELD
See Polymaster Large Water Tanks hard at work in the field.
WATER TANK CASE STUDIES
Trusted by Australian Properties to Deliver These Projects
Polymaster’s large water tanks are manufactured to the highest quality standards, independently certified, and trusted by farmers, rural operators, and commercial managers across Australia.
Can't Find the Tank You Are Looking For?
Talk to our team. We’ll help you match the right large water tank size and profile to your property, water storage requirements, and budget.
MORE WATER TANK SOLUTIONS FROM POLYMASTER
Explore Our Full Range of Water Tank Solutions
Our large tank range is one part of what Polymaster offers. If your property needs a mid-size tank, a compact slimline option, or underground storage, we have you covered.
Medium Water Tanks
For family homes, large gardens, and small rural properties, our medium range covers 5,000L to 13,600L across corrugated and smooth wall profiles — the right bracket for reliable household and supplementary agricultural supply.
View Range
Round Water Tanks
View Polymaster’s full round tank range from 200L to 50,000L, including all corrugated RWT and smooth wall PCR sizes, in one place.
View Range
Slimline Water Tanks
For narrow side yards, fence lines, and tight urban blocks, our slimline range delivers solid capacity without taking up yard space, available from 600L to 5,000L in 17 Colourbond style colours.
View Range
FAQs
Frequently Asked Questions
Everything you need to know about Polymaster’s large water tank range, from sizing and delivery through to site preparation and maintenance.
How much does a 22,500 litre water tank cost?
Pricing varies depending on the profile (corrugated RWT22500 or smooth wall PCR22500), your location, and delivery zone. For a current delivered price to your property, use the instant quote tool above or call our team on 1800 062 064. Pricing is not published online as delivery distances and site access requirements affect the total cost.
How much does a 50,000 litre water tank cost?
The RWT50KL Mega Tank is Polymaster’s largest poly tank at 50,000L capacity. Pricing depends on your location and delivery requirements. Due to the size of this tank, site access planning is required before delivery can be scheduled. Contact our team on 1800 062 064 for a tailored quote including delivery to your property.
What are the dimensions of a 22,500 litre water tank?
Polymaster’s RWT22500 corrugated round tank has a diameter of 3,560mm, an overall height of 2,800mm, and an inlet height of 2,470mm. The PCR22500 smooth wall version has a diameter of 3,573mm, an overall height of 2,879mm, and an inlet height of 2,559mm. All measurements are approximate. Contact our team to confirm current dimensions and delivery requirements for your site.
What are the dimensions of a 50,000 litre water tank?
Polymaster’s RWT50KL Mega Tank has a diameter of 4,600mm, an overall height of 3,440mm, and an inlet height of 3,290mm. All measurements are approximate. Due to its size, this tank requires careful site access assessment prior to delivery. Contact our team to discuss your site requirements before ordering.
What size water tank do I need for a 3-bedroom house?
For a standard 3-bedroom home using rainwater for garden irrigation, toilet flushing, and laundry, a tank in the 5,000L to 13,600L range is typically sufficient. Tanks in the 22,500L to 50,000L range are more suited to large rural properties, farms, and high-demand applications where rainwater is the sole or primary water supply. If you are on tank water only and managing a 3-bedroom home on a rural property, a 22,500L tank provides a more substantial buffer against dry periods. Contact our team to discuss your specific requirements.
How much does a 25,000 litre water tank cost?
Polymaster does not manufacture a 25,000L tank. The closest sizes in the large range are the RWT22500 at 22,500L and the RWT31700 at 31,700L. For pricing on either of these, contact our team on 1800 062 064 or use the instant quote tool above.
Can I link multiple large tanks together?
Yes. Every Polymaster round tank can be interconnected with other tanks to increase total holding capacity without limit. This is a practical solution for properties where demand exceeds what a single tank can supply, and where installing one very large tank is not practical due to site access, space constraints, or budget staging. Contact our team to discuss the right configuration for your property.