Big Water Tanks is the newest of the large water tank manufactures in the New Zealand Market, and this is why we do things a little bit differently...Browse the below points to find out more about our tanks.
Our Warranty is the best on the market, we do not offer a pro-rata warranty but a full repair or replace 20 year warranty. providing the tank installation was done correctly.
Our online registration makes sure of that we want to ensure you do not have a problem with your tank any time in the future, we even request installation photos and would come out and check to see is it meets the standard if we feel there are any issues.
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 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
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 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 accomdate your delivery before we leave.
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. Things to consider:
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. Our installation guidelines are as follows:
Dig the hole 100mm deeper and about 4m Diameter (100mm bigger than the tank), taper the walls with a 10° slope or greater if the soil is loose. It is recommended to put a retaining cloth or even weed-matting around the cut face to prevent erosion.
Tank Drainage Preparation:
Install a 100mm socked drainage coil around the edge of the hole and run that into a lower drain at a fall of at least 1:100
Tank Base Support:
The Bottom of the hole should be filled with GAP7 Stone (metal) and be well compacted, if the surrounding soil is very clay like and or does not drain too well the outer edge (by the drainage coil) can be replaces with scoria to allow for better drainage with a little metal over the top.
The trench should be back-filled with scoria to allow water to drain away.
Install the tank:
Drop the tank into the hole and centre it. Back-fill the sides of the hole with Bark this does not need to be compressed and is there to stop children and items from falling into the hole. Install a water outlet connection above ground level with a flexible hose using a tank compression fitting. Connect the gutters to the tank as per other instructions.