2 x 30000 litre Water Tanks Combo Incl. Accessories

Mist Green
Heritage Green
Light Grey
Dark Grey
Slate Grey


Big Water Tanks Limited manufactures and sells high quality, potable water, Plastic Water Tanks in Auckland New Zealand. We are proud of the fact that we produce the heaviest tank with the simplest and strongest design - our 60000 litre water tank has a simple, strong dome that is self-supporting. We also use the largest "standard" shot weight of plastic, which makes our wall thickness the greatest.

Our tanks are manufactured on a custom-built, rotational moulding machine with internal temperature logging and a set point for cooking a perfect plastic water tank every time.

2 x 30000 litre Plastic Water Tank (13,200 Gallons)

  • Included in this Awesome Combo Special

    • 2 x 30,000 litre Water Tank
    • Hose Connection Kit (covers very basic setup)
      • 6m 32mm Hose
      • 2 x 50-32mm Hansen Reducing Bush (HAN-HRHN5032)
      • 2 x 32mm Hansen Ball Valve (HAN-HBV32)
      • 2 x 90° 32mm Hose Fitting (HAN-HMBS32)
      • 1 x 32mm T (HAN-HT32)
      • Straight 32mm Hansen Hose Fitting (HAN-HMS32)
      • Socket Reducer (HAN-HSRS3225)
      • 1000 Watt Pump
      • 80l per minute
      • Ideal for 7 to 8 Taps over 2 level
      • Will suction lift 8 meters
      • 25mm BSP Female Input and 25mm BSP Male Output with built in Union connections for easy service
      • Visit the page on the DAB-JETCOM132NXTPfor more information

    • Huge Double Stage Sediment and UV Filter System
      • 20" x 4.5" Double Stage filter Housing
      • 20" x 4.5" 20 micron pleated Filter
      • 20" x 4.5" 1 micron polyspun Filter
      • 55W UV System
    • Includes Pump Cover
        • Excludes the fittings and pipes to connect the pump to the filters

        Tank Description

        • We offer a full 20-Year Repair or Replacement Warranty (not pro-rata).
        • Our super-tough dome design is the largest on the New Zealand market. The dome has the smallest radius, which gives it engineered support.
        • We have the heaviest standard plastic water tank on the market; at 500kg this is in direct relation to wall thickness and product quality strength.
        • The tank is available in a range of colours and is designed for potable drinking water.
          • Please contact us should you wish to use these 60000 litre water tanks for any other use.
        • Outlet Size: 50mm BSP
        • Manufactured in Auckland, New Zealand.

        Tank Standards

        • Raw Material
          • Type: Medium Density Polyethylene
          • Standard: AS/NZS 2070 - Food Contact Requirements
          • AS/NZS 4020:2005 - Potable Drinking Water
          • AS/NZS 4766 Polyethylene Storage Tanks for Water
        • Manhole access with removable lid
      • Diameter 3.78 m (3,780mm) each
        Height 3.1 m (3,100mm) each
        Weight 1,000kg (2 x 500 kg)
        Volume 60,000 litres (2 x 30,000 litres)
        Outlet 50mm BSP
        UV Rating UV20
        Compliance Australian food contact requirements (AS2070:1,8) and potable (drinking) water standard AS4020

      • Feel free to contact us should you have any questions or need any further information.


        We have a full range of Accessories to add to your water tank(s) including:  

      • Why Choose Big Water Tanks?

        Big Water Tanks 30,000 litre Water tanks are strong, with a simple design to optimize the most strength, we have the heaviest shot weight of any standard 30,0000 litre water tank on the New Zealand Market

        Our Dome

        our Dome has the most curve on the market, that combined with the heaviest shot weight, makes this dome fully self supporting, without the need for a frame to support it.

        Please note that while we have developed the strongest dome, the tank still needs to be vented, suction from a pump can cause any dome to collapse if the air cannot move.

        Plastic Material

        Our Plastic is manufactured here in New Zealand to an incredibly high NZ AUS Standard and is suitable for potable water

        Our plastic resin has been specifically designed as a large tank grade material with the best UV Stabilisation available

        No Corrugations

        Our tanks have no corrugations or indentations, the reason for this is strength.

        We Believe that the corrugations create a weaker tank because they allow for more movement like an accordion in a vertical direction creating small stresses at each corrugation

        In the process of rotational moulding corrugations are thinner on the convex curves and thicker on the concave creating an uneven wall thickness through the tank,

        The larger surface area of a corrugated tank means that with the same amount of plastic the effective wall thickness is reduced

        How does Delivery work?


        Please use the checkout procedure for estimates on freight, we reserve the right to cancel an order if freight is incorrectly calculated by our website, our site cannot calculate some rural areas or island deliveries, we will contact you if there is an issue with a freight costing to your location.

        We Deliver Water Tanks throughout the North of North Island, Our rates are based on distance, that makes us a bit more expensive for "far away" deliveries we can arrange freight to most islands, please call us or contact us with your address and details we can confirm the price for the delivery

        Delivery Process

        Our Delivery prices are subject to our approval and are to the "gate", however we will normally assist putting the tank into its final location if it is safe for us to do so and our vehicles can make the trip, sometimes a digger or crane is required in hard to reach locations

        Please notify us of any known obstacles, low bridges low power lines or narrow roads... en route to your property we can decide how to accommodate your delivery before we leave.

        Tanks are Pushed off the drivers side of the trailer and land on the base of the tank in a safe location, the tank can be pushed, dragged or lifted into the final installation location.

        How do we Install a Water tank?

        Buried Tanks

        A buried tank needs careful consideration and every situation is a little different, while our tanks are strong enough to be buried up to 700 mm we recommend that you give us a call to discuss your specific situation.

        Tanks like swimming pools can pop up out of the ground if there is no water in them, if a tap in the house is left on in the middle of winter when the ground is very damp, if the tank empties the buoyancy is huge it will lift out the ground and will break connection pipes and mean the tank would need to be reinstalled...

        As a simple guide you cannot bury a tank deeper than the lowest part of your section or natural drainage with a 1:100 fall. So if you have a flat site or section with no falls or that is very flat, burying the tank is not recommended or covered by our warranty in the event of uplift.

        Download our Instructions

        Download a PDF of our installation instructions

        How Much Water Storage is needed?

        Lets keep this simp"ish" because there are a large number of factors that increase or decrease water usage....

        An average house is 200m² with an average rainfall of 1200mm that is 240,000 L rainfall a year

        If you collect all your water (none overflows) that the following per person per year:

        • 1 Person 657L
        • 2 Persons 328L
        • 3 Persons 219L
        • 4 Persons 164L
        • 5 Persons 131L

        The New Zealand water usage average is about 200L per person per day (this is an average not conservative country living...)

        In Summer months the average north island water fall is as low as 72mm / month, this can be as low as 10-20mm per month in bad months...

        Our Water tank can store 30000L of water this with a minimum rainfall of 30mm for 3 months on a 150m² roof is:

        30,000L if full + 30 x 3 x 150 = 43,500L for 90 days of bad weather

        • 1 person 480L
        • 2 Persons 240L
        • 3 Persons 160L
        • 4 Persons 120L
        • 5 Persons 96L

        60,000if full + 30 x 3 x 150 = 73,500L for 90 days of bad weather

        • 1 person 800L
        • 2 Persons 400L
        • 3 Persons 266L
        • 4 Persons 200L
        • 5 Persons 160L

        As a basic rule 1 tank for up to 3 people and 2 tanks for 4-6 people, larger installations of three tanks only help if there is adequate roof collection area

        Give us a call, drop us an email or message us on the below links we can assist you with your calculations based on your area and roof.

      Customer Reviews

      Based on 4 reviews
      Excellent Service

      Thanks for the prompt and excellent service and a big thanks to the delivery man, Callie for his efforts and excellent service.

      Hugh Tank you to the team

      What a fabulous team at BWT.
      From the office lady, who replied and answered every question straight away .
      The Deliver person [Callie] who got them right to where we needed them .
      And of course the team who actually make them.
      They were paid for and plumbed in within a week.

      A Hugh thank you to the team

      Maurice and Linda

      Leilanie Bennett
      highly recommend

      We would highly recommend BWT for your water tank requirements as they have provided a fantastic service for us.
      We had some date and weather issues and BWT and their driver were great in working with us. A big acknowledgement to Callie, our BWT driver who was awesome on the day and is very much appreciated.

      Our thanks for a great service, look forward to posting when we have our tanks in.

      Ngā mihi nui,

      Chris Wium
      Highly recommended

      We bought the 60000litre water tank combo with pump and UV accessories. Best price by far. Wonderful friendly service and prompt delivery. Tanks were expertly delivered onto my timber skids by Jim who went the second mile to place them accurately and safely. Highly recommended.
      Thanks for a great service! 10 out of 10!
      Regards Chris and Melanie