5000 litre Plastic Water Tank

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Big Water Tanks manufactures and sells high quality, potable water, Plastic Water Tanks. Our range includes some of the heaviest tanks on the market and we pride ourselves on manufacturing and supplying superior products. This 5000 litre water tank is a great looking, extremely tough and robust plastic tank. 


5,000-litre Plastic Water Tank

      • A heavy-duty tank with a strong dome and screw access lid about 450mm Diameter access.
      • This 125kg small tank is strongly built and is tough enough to withstand the test of time.
      • The tank is available in a range of colours and is designed for potable drinking water.
      • Outlet size: 50mm BSP
      • Lifting lugs can be inserted in to pre moulded M10 threaded fixtures
      • Fully formulated long term UV stabilisation rated at UV20 providing superior UV protection.
      • Hinged manhole access with removable lid
        • Please contact us should you wish to use this 5000 litre water tank for any other use.

    Tank Standards

    • Raw Material
      • Type: Medium Density Polyethylene
      • Standard: AS/NZS 2070 - Food Contact Requirements
    • AS/NZS 4020:2005 - Potable Drinking Water
  • Diameter 1.75 m (1,750mm)
    Height 2,450 m (2,450mm)
    Weight 125 kg
    Volume 5,000 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:  

    • How big are 5000l water tanks?
      Diameter: 1750mm
      Height: 2450mm
      How Heavy is a 5000l Water Tank?
      Weight: 125kg
      Why Choose Big Water Tanks?

      Big Water Tanks 300l - 10,000l plastic water tanks are heavy duty and built to last. If you compare them to other products you'll see the difference in weight and thickness, this makes them renowned for their strength and quality. The tanks are supplied with tie down eyelets to make them easy to install and secure once in place.

      Tank Top

      Proven ridging design on the top  prevents the possibility of sagging.

      The turreted manhole is situated on the edge of the tank to allow for easy inspection, cleaning and installation of inlets and ball valves if required.

      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

      The plastic resin complies with Australian food contact requirements (AS2070:1,8) and potable rinking) water standard AS4020

      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 500 mm we recommend that you give us a call to discuss your specific situation (Note: Tanks Smaller than 1,000l may NOT be buried).

      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's 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 small Water tank range can store up to 10,000L of water this with a minimum rainfall of 30mm for 3 months on a 150m² roof is:

      5,000L if full + 30 x 3 x 150 = 18,500L for 90 days of bad weather

        • 1 person 205L
        • 2 Persons 102L
        • 3 Persons 68L
        • 4 Persons 51L
        • 5 Persons 41L
        • /ul>

      10,000L if full + 30 x 3 x 150 = 23,500L for 90 days of bad weather

          • 1 person 260L
          • 2 Persons 130L
          • 3 Persons 87L
          • 4 Persons 65L
          • 5 Persons 52L

      As a basic rule 1 10,000L tank for up to 1 person and 2 10,000L tanks for 2 people

      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
    Overall a most satisfactory customer experience.

    Callie delivered the tank this morning and I wish to give feedback.
    Callie arrived early and was excellent with assisting on the sand pad layout & levelling. And then gave excellent feedback on piping needs to make the new tank fit in with our existing tank and operate efficiently

    Ken Ross
    Thank you for the excellent service

    Hi Sharon and Vincent,

    Thank you for the excellent service. I am delighted with the tanks and the really prompt and responsive delivery.


    Great Tank and Service

    From the ordering online to the delivery all very professional and helpful. I cant remember the delivery drivers name but he went out of this way to make things as easy as he could for me , didn't rush at all even went out of his way to show me what I needed to do and gave me some great tips . Will be purchasing a larger tank soon and will be definitely will be using BWT again.
    Cheers Trudy.

    Thanks very much for the review

    Excellent customer service

    Firstly, the dimensions of the 5000 litre tank fitted our tight placement. The communication with Big Water Tanks was always prompt (even on weekends) and they always had the answers. Right through to delivery they have been great. Even suggesting a Hiab operator to lift it over the garage through to suggesting the correct fittings for our particular use. Tank is very well made and robust. Thank you Vincent!

    Hi Chris, I am glad our advice has helped make your purchase smooth and easy... thanks for the order.