BWT4-MG
$895.00 NZD
$995.00 NZD
You save: 10% (
$100.00 NZD
)
All prices include GST
Our 4000 litre water tank delivers the perfect balance of capacity and practicality for New Zealand homeowners and lifestyle block owners. While not designed as a full household water supply, this tank excels in multiple specialized applications including optimal garden irrigation for medium to large vegetable gardens, lifestyle property essentials for small farms and rural needs, reliable stormwater detention to meet council requirements, and effective header tank performance for gravity-fed systems. Manufactured from premium, UV-stabilised polyethylene, this durable 4000L plastic water tank is built to withstand New Zealand's harsh climate while providing an eco-friendly water solution that reduces your environmental footprint and water bills.
When you choose our 4000 litre water tank, you're investing in a product built to last. We've integrated critical features such as light-blocking technology and a lower profile design to ensure optimal performance in a variety of settings. Plus, with a 20-year warranty, you can have complete confidence in your purchase
| Specification | |
|---|---|
| Capacity | 4,000 Litres |
| Material | Medium-Density Polyethylene (MDPE) |
| Colours | Mist Green, Heritage Green, Light Grey, Dark Grey, Slate Grey, Beige and Black |
| UV Protection | Yes, Full UV Stabilised |
| Food Grade | Yes, Safe for Potable Water |
| Outlet | Standard 2" (50mm) BSP Threaded Fittings |
| Diameter | 1750mm |
| Height | 1950mm |
| Lid | Approximately 450mm |
| Weight (Empty) | Approximately 100 kg |
| Best For | Storm Water Detention, Residential Gardens, Rain Harvesting, Emergency Storage and Stock Header Tanks |
Mist Green 4000L Water Tank in a beautiful setting.
A Black 4000l Water Tank ready for a storm water managment system
A Dark Grey 4000l Water Tank ready for a tiny house
Dark Grey 4000l Detention Water Tank
A pair of 4,000L Dark Grey Water Tanks for Tiny House
A heritage green 4000l delivered to our Customer
A mist green 4000l water tank in place
Delivered to the road side as the low carpark at sylvia park could not accommodate the height on the delivery truck, these tanks were fitted into a low height section of the malls carpark
A slate grey 4000l water tank rolled into place as these are quiet easy to move around even on soft ground
| Details | |
|---|---|
| Delivery Estimate | Typically 3-4 Weeks across Upper North Island |
| Shipping Cost | Calculated at checkout based on your location. |
| Collections | We often have a number of these tanks in stock at 21 Akatea Road, Glendene. These Tanks are relativly large and would fit in a large flat deck ute or on a trailer. |
| Packaging | Product is shipped as a Water tank without any wasteful packaging. |
| Installation | This is a DIY-friendly product. Ensure the site is flat, stable, and clear of sharp objects. |
This 4,000L water tank's ideal balance of substantial capacity, practical dimensions, and potable-water-safe design makes it exceptionally versatile for various residential, rural, and commercial applications.
Download our Manual above for more information.
This is an important question for tiny home living. While a 4000L tank can be part of your water system, we generally do not recommend it as the sole primary water source for a full-time tiny home, especially if you will be relying on paid water deliveries. This is because water delivery trucks typically carry a minimum of 8,000 to 12,000 litres per load, and you are charged for the entire delivery. Filling a single 4,000L tank this way is therefore not cost-effective. Furthermore, the limited roof space on a tiny home restricts how much rainwater you can collect, meaning you might struggle to keep the tank replenished through rainfall alone with regular use.
However, this tank is an exceptionally versatile and highly effective solution in two specific scenarios:
In summary: For a self-sufficient primary supply, we recommend looking at our larger 10,000L tank. But for supplementing your system, managing a trickle supply, or creating an efficient greywater recycling setup, the 4000L tank is an ideal and cost-effective choice.
Yes, your 4,000L tank is manufactured from premium, UV-stabilized polyethylene that is certified to food-grade standards. This makes it entirely suitable for storing safe drinking water (potable water) when correctly set up. For optimal water quality, we recommend installing a first-flush diverter for rainwater collection and performing periodic maintenance as needed.
Installation is straightforward. Choose a location that is flat, stable, and can support the weight of a full tank (4,000L of water weighs 4,000kg). A level concrete pad or a compacted base of crusher metal (GAP 7 Stone) is ideal. Ensure the area is clear of sharp objects that could damage the base. Once positioned, you can connect your downpipe to the through a hole you need to drill into the tank and using a Rubber Tank Seal, Install an Overflow, and attach a hose to the outlet fitting or connecting it to a pump.
We Recommend reading the installation instruction manual on this page in the download section
Yes, we stand behind the quality of our products. This 4,000L water tank comes with a 20 year manufacturer's warranty against defects. Please refer to our warranty policy page, download our manual just above or contact us for specific terms and duration.
Our 4,000L Plastic water tanks are very low maintenance. The main task is to occasionally check and clean the inlet and overflow to prevent blockages from leaves and debris. It is also good practice to inspect the inside of the tank every few years for any sediment buildup and clean it out if necessary.
Inspect the base materials have not washed out and the tank remains on solid ground.
Regularly check the tank for any signs of damage or leaks, especially around the fittings and seams.