8400 Litres Economy Underground Rainwater Harvesting Garden System

£6,195.60 £5,163.00


Lead Time
Next day delivery is available. 2 - 3 weeks
Delivery Cost
Free UK Mainland Delivery


More Information
Length - mm 3970
Width - mm 2700
Height - mm 1725
Capacity - Litres 8400
Capacity - Gallons 1850
Suitable for Drinking Water (Potable) No
WRAS Approved No
Warranty 10 Years
Construction Material Polyethylene


  • Ideal for use in gardens to feed hoses for car washing or general garden irrigation
  • Can have a long lifespan when set up and maintained correctly
  • Stores an incredible amount of water, massive 8400 litre capacity 
  • Easy to install with environmentally friendly pea gravel backfill
  • Shallow dig required with low profile
  • Added strength and efficiency with the ribbed and curved design
  • 10 year warranty

This 8400 Litres Economy Underground Rainwater Harvesting Garden System offers a practical solution for collecting and storing rainwater to use in the garden for purposes such as irrigation or washing the car. It is suitable for large-sized applications.

The 8400 litre tank is rotationally moulded from high strength polyethylene and complies with EU and UK regulations. Designed with strength in mind, it is shorter in height compared to other tanks on the market today. This means that a shallower hole is needed to accommodate the tank, and this can be by as much as 500mm less. 

The ribbed design provides added strength and efficiency, while also allowing for an environmentally friendly pea-gravel backfill, eliminating the need for a time consuming and high cost concrete base and backfill to be used. The curved element of the design also enables all water, even from the bottom of the tank to be pumped out.

These tanks are amongst the most dependable on the market and as such are supplied with an industry leading 10 year warranty. With the correct installation and general on-going care, these tanks have a long lifetime ahead of them with very little or no maintenance required.

This system includes:

  • 8400 litre polyethylene tank
  • Pedestrian rated telescopic neck and lid
  • GXRM stainless steel submersible pump
  • Rodent guard
  • Rainwater filter
  • Pump turret

In-Tank Filter

As standard, a PF filter is pre-installed into the neck of the tank. The filter removes leaves, grit and other debris from the rainwater passing through. The filter requires very little maintenance, usually about 3-4 times each year and is very quick and easy to clean with no consumables, just lift, rinse and replace.

Submersible Pump

This system is supplied with a Calpeda GXRM stainless steel submersible pump which sits in the bottom of the tank and has sufficient power to service most garden based water requirements such as hoses and irrigation.

Pump Turret

The pump turret is a flexible plastic connection between the pump and access port which allows smooth flow of the pumped water out towards its point of use.

Rodent Guard

The rodent guard protects the water inside the tank from rodents and large debris which could contaminate the water by entering via the overflow.

Important Delivery Information

Please note the price of this tank includes delivery to an address in England or Wales. Deliveries to Scotland, Northern Ireland and offshore islands may incur a surcharge. Please contact us for delivery charges to any of these locations.

The delivery will be unloaded from the vehicle by the delivery personnel; however, responsibility then passes on to the customer to move the tank into position.

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