Best Poly Water Tanks: How Duraplas Compares

When people ask which poly water tanks are best, the practical answer is not just the cheapest tank or the biggest capacity. The best poly water tank is the one that matches your site, water-storage needs, delivery access, warranty cover, standard inclusions and long-term support.

Duraplas poly water tanks are a strong choice for Australian homes, farms and businesses because they are Australian-made, designed for demanding local conditions, supported by The Tank Factory team and available in practical round, slimline, underground and underdeck options.

Round poly water tanks | Slimline poly water tanks | Underground poly water tanks | Underdeck poly water tanks

Best Poly Water Tanks Australia: What To Compare

A good poly tank comparison should look at more than brand name. Warranty terms, certification, tank design, material quantity, fittings, delivery requirements and after-sales support all affect long-term value.

Comparison point	Why it matters	Duraplas / The Tank Factory signal
Australian manufacture	Local manufacture supports product knowledge, supply control and warranty accountability.	Duraplas has manufactured tanks since 1984, with The Tank Factory supplying the Duraplas poly tank range online.
Tank design	One-piece rotationally moulded poly tanks avoid vertical join lines and are designed to handle stored-water pressure.	Duraplas New Generation Polytank design uses computer-aided rib design, no vertical join lines and a self-supporting dome roof on applicable models.
Certification	Independent product certification helps confirm the tank is built to the relevant poly tank standard.	Applicable Duraplas models are product-certified by BSI to AS/NZS 4766:2006 under Benchmark Product Certification Certificate BMP 717633.
Warranty cover	Warranty length and terms matter when comparing long-term value, not just upfront price.	Applicable New Generation round and slimline rainwater tanks carry a 20-year manufacturer’s warranty: 10 years repair or replace plus 10 years pro-rata.
Material quantity	Published shot weights help customers compare the amount of polyethylene used in each model.	Duraplas product pages publish nominal dimensions and shot weights for many tank models.
Standard inclusions	Included fittings affect total purchase value and installation planning.	Applicable Duraplas rainwater tanks include an inlet strainer, 90mm overflow, 25mm brass outlet and matching 25mm ball valve as standard.
Delivery planning	Large poly tanks need suitable access, unloading space and the right number of people onsite.	The Tank Factory product pages show delivery notes and required onsite assistance. Suitable property access remains the property owner’s responsibility.
Best tank shape	The right tank shape depends on available space, capacity needs and site layout.	Round tanks suit value-per-litre storage, slimline tanks suit narrow spaces, underground tanks suit hidden storage, and underdeck tanks suit elevated homes or low-profile spaces.

Poly tank warranty | Duraplas tank features | Poly tank delivery

Over 250,000 Tanks Manufactured Since 1984

When comparing poly water tanks, it is important to look beyond capacity and price. Tank design, material quantity, warranty terms, standard inclusions, outlet fitment, manufacturing experience and after-sales support all contribute to long-term value.

Comparison based on the best available public information published by the respective companies and reviewed in June 2026. Product specifications, inclusions and warranty terms may change. Confirm current model-specific information before purchasing.

View detailed Duraplas tank features and product-certification information

Which Duraplas Poly Tank Is Best For Your Site?

Round poly water tanks are usually the best starting point when you have enough open space and want strong value per litre.

Slimline poly water tanks are usually best for narrow spaces beside homes, sheds, fences and side passages.

Underground poly water tanks are usually best when above-ground storage is difficult, unattractive or takes up too much usable yard space.

Underdeck poly water tanks are usually best for elevated homes, decks and low-profile spaces where the tank can be tucked away out of sight.

Why Choose a Duraplas Poly Water Tank?

There are several practical reasons to choose an Australian-made Duraplas poly tank from The Tank Factory.

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Australian-Made Duraplas Poly Tanks

Duraplas poly tanks are rotationally moulded in Australia from UV-stabilised polyethylene and designed for demanding Australian conditions. Applicable models are product-certified by BSI to AS/NZS 4766:2006 under Benchmark Product Certification Certificate BMP 717633.

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20 Year Manufacturer’s Warranty

Applicable New Generation Cylindrical and Slimline Urban rainwater-tank ranges carry a 20-year manufacturer’s warranty: an initial 10-year repair-or-replacement period followed by a further 10 years calculated on a pro-rata basis. The same full warranty period applies across these applicable round and slimline ranges.

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Experienced Delivery Planning

Once production and freight planning have been confirmed, the order is scheduled and the customer is contacted before delivery. Delivery timing can be affected by traffic, weather, loading requirements and other transport conditions. Suitable property access and the required onsite assistance remain the property owner’s responsibility.

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Experienced Product Support

Our experienced team can explain tank sizes, fittings, accessories, delivery requirements and general installation information. Final plumbing, hydraulic, structural and engineering decisions must be confirmed by a suitably qualified professional.

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Competitive Factory-Direct Value

The Tank Factory is the online sales division of Duraplas Industries. Customers have direct access to the Duraplas poly tank range, clear product information, standard tank inclusions and experienced support at competitive prices.

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Standard Rainwater Tank Inclusions

Applicable Duraplas rainwater tanks include an inlet strainer, 90mm overflow, 25mm brass outlet and matching 25mm ball valve as standard. Inclusions can vary for specialised products, so the applicable model details should be checked before ordering.

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Duraplas Industries – ARMA Member

Duraplas Industries is listed in the Association of Rotational Moulders Australasia business directory. ARMA supports the rotational-moulding industry through collaboration, education, innovation, standards development, training and the exchange of industry knowledge.

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42+ Years Under the Same Ownership

Duraplas has operated under the same ownership since 1984 and has manufactured more than 250,000 tanks. This continuity supports long-term product knowledge, warranty accountability and experienced after-sales assistance.

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"Today I experienced the best customer service I could imagine."
 — T Marker

Hi the tank factory, Today I experienced the best customer service I could imagine . - I needed to arrange people to help with the delivery / installation . - Delivery was made 5 minutes within ETA - The driver assured me, there was no reason to be concerned about what was going to happen . - I had 3 people with me to assist the exercise . - The driver explained how things would happen with safety being paramount . - It happened as he said it would . The 3 people I had to help were a 23 y/0 labour // 45 y/o fireman // 50 y/o sales rep . We all agreed that the driver was somebody that " the tank factory ' should be very proud of as an employee . Congratulations -- he is the face of your business to the client like me . My invoice number was 4574 . Regards,

"I congratulate you and The tank Factory staff not only on the presentation of the tank but the communication and assistance thoughtout"
 — Ray and Lorraine

Good Morning Russell, Lorraine and I would like to pass on our thanks and congratulate you and The tank Factory staff not only on the presentation of the tank but the communication and assistance thought out, the colour is brilliant and matches the roof exactly. It was a pleasure to deal with such a firm please pass on our thanks to all concerned including Rod who delivered the tank he is an asset to the company. Although he would have looked better with his NSW cap on I am also from NSW and my mate Peter could not say much as we were 2 against 1 him all in good fun. All this would not have been possible had it not been for you many thanks and all the best for the future. Regards, Ray and Lorraine

"Our tank looks amazing. Great product and excellent service... thank you!"
 — Sue and Steve

Hi there, We ordered a 22,700 litre water tank via The Tank Factory and our tank was delivered today by Murray. We would just like to say thank you for the fantastic service we received from Russell at the Tank Factory and from Murray. Murray arrived when he said he would, placed the tank expertly on the pad and all this was done with a wonderful attitude.Our tank looks amazing. Great product and excellent service... thank you! Kind regards, Sue and Steve

"I would have no hesitation in recommending The Tank Factory to my friends and associates based on this experience"
 — Bob

Jay/Russell, The tanks arrived today and I just wanted to say that the driver who delivered the tanks (Rod) was very good in keeping us informed on delivery time and displayed great customer service with the delivery and discussions about the tanks with both myself and plumber. He certainly is a credit to your company and I would have no hesitation in recommending The Tank Factory to my friends and associates based on this experience. Please forward this email to the Head of your Customer service section. Thanks Bob

"It has been a pleasure doing business with you and I would have no hesitation in recommending you to friends. "
 — Derek

Good morning, We got our tank yesterday morning as promised. Many thanks to Nathan for his guidance and help in getting the tank into the right spot. His attitude and friendliness are a credit to both himself and your company. It has been a pleasure doing business with you and I would have no hesitation in recommending you to friends. Regards, Derek

"We are very happy to see our tanks on site and delivered safely"
 — Mary Klazema

Hi Russell, As discussed on the phone, I just wanted to commend the delivery team who delivered and installed our tanks. Jim and the boys were very professional and are a credit to the Tankworks team (who deliver the steel range of tanks for The Tank Factory). Our property has a steep driveway and Jim manoeuvred the truck so skilfully, his driving skills are outstanding which allowed the tanks to be unloaded with minimal fuss. They worked cooperatively and professionally. Thank you to all, We are very happy to see our tanks on site and delivered safely, From, Mary Klazema

"Your professionalism and service were outstanding throughout the purchase"
 — Matt Meury

Luke, apologies for not sending this sooner. I would like to THANK yourself and the whole team for all your help organising and delivering my new water tank. Your professionalism and service were outstanding throughout the purchase. I was always kept up to date and nothing was too hard. Well done Luke and the team. I cant speak more highly of Duraplas. Please forward this to John. Regards, Matt Meury

"It is always a pleasure to interface with men of this calibre. Thank you"
 — Rowley & Clare from Dorrigo, NSW

On 1-Oct, two 5,000 gallon tanks were delivered to our rural property outside Dorrigo. I merely write to compliment you on your delivery team of Bert & Mick who are a credit to your company. Firstly, they kept us informed of their expected arrival time. Secondly, we found them to be top “can do” blokes who skilfully off-loaded both tanks precisely where we wanted them. It is always a pleasure to interface with men of this calibre. Thank you Rowley & Clare, Dorrigo, NSW

 — Tate

Hello, Out tanks were delivered this week as planned.. Just wanted to let you know the delivery guy was exceptionally nice and helpful.. Thats on top of the whole ordering process being easy. Please keep doing what you are doing 🙂 Look forward to ordering from you in the future. Regards Tate

"Considering the quality of your product, I believe I received the best available product for a good price"
 — Alex from Stokers Siding

I recently purchased a tank online (Inv 6692) that was delivered by Tweed Tanks last week. This is the 4th Duraplas tank I have purchased. I wish to commend the delivery driver on his prompt & professional service. The experience was positive & exceeded any expectation I had. I would also like to commend you on delivering a quality product. The price was not the cheapest but was extrememly competative & I chose to support a local company. Considering the quality of your product, I believe I received the best available product for a good price. I will continue to recommend & use your products. Regards, Alex from Stokers Siding