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3400 Litres Economy Underground Rainwater Harvesting Garden System

Tank Specifications

Length - mm 3680
Width - mm 1260
Height - mm 1360
Weight - kg 157
Capacity - Litres 3400
Capacity - Gallons 747
Construction Material Polyethylene

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Product Code: WAB.3400.E

£2,254.00 (ex. VAT)

£2,704.80 (inc. VAT)

UK Mainland Delivery: Free Delivery
Delivery: 3-5 working days

Tank Specifications

Length - mm 3680
Width - mm 1260
Height - mm 1360
Weight - kg 157
Capacity - Litres 3400
Capacity - Gallons 747
Construction Material Polyethylene

This 3400 Litres Economy Underground Rainwater Harvesting Garden System is ideal for collecting and storing rainwater to use in the garden for applications such as irrigation or washing the car. The 3400 litre system is suitable for smaller applications, however storing 3400 litres of water will provide an excellent supply of water for use in your garden. 

This system includes:

  • 3400 litre polyethylene tank
  • Pedestrian rated telescopic neck and lid
  • GXRM stainless steel submersible pump
  • Rodent guard
  • Rainwater filter
  • Pump turret

3400 Litre Tank

The 3400 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. 


  • 3400 Litre / 747 Gallons capacity
  • Made in the UK
  • Made from high strength polyethylene
  • Ribbed and curved design provides added strength and efficiency
  • Low profile means a shallower dig is required
  • Large 600mm diameter access allows inspection and maintenance
  • Easy to install with environmentally friendly pea gravel backfill
  • Ideal for areas with a high water table
  • 10 year warranty

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.

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 in to position.

Rainwater Harvesting FAQ's

What is rainwater harvesting?

Rainwater harvesting is the collection of rainwater directly from the surface or surfaces upon which it falls. This water would otherwise have gone directly into the drainage system or been lost through evaporation and transpiration. Once collected and stored, the rainwater can be used for non-potable applications such as toilet flushing, garden watering and washing clothes using a washing machine.

Why should I consider a rainwater harvesting system?

Despite the common perception that it rains a lot in England and Wales, water resources are under pressure. Demand for water is rising due to the increase in the population, changes in lifestyles and due to the impacts of a changing climate.

In the South East of England, where large numbers of people live and work, water is scarcer than anywhere else in England and Wales. In fact there is less water available per person in this region than in many Mediterranean countries.

What savings can be achieved by using a rainwater harvesting system?

Any rainwater harvesting system will reduce your dependence on the mains water supply.

Potential savings should be assessed on an individual basis before any system is implemented. Factors which will influence this are; the demand for non-potable water, the amount of rainwater that can be collected and whether the property is charged by volume of volume used.

Savings will be higher in commercial/industrial buildings and schools. This is due to these types of buildings having much larger roof areas and a much greater demand for non-potable water compared to private dwellings.

Financial savings are usually higher when a system is installed during construction of the premises as retrofitting a system can be expensive as well as disruptive.

What are the benefits of using a rainwater harvesting system?

A rainwater harvesting system will reduce the demand for mains water and relieve pressure on available supplies. Reducing the volume of mains water supplied means that less water is taken from lakes, rivers and aquifers and more is left to benefit ecosystems and help sustain the water environment.

A rainwater harvesting system can also reduce the risk of flooding and pollution as less rainwater is discharged to drains and sewers and, ultimately, to rivers. They can contribute to slowing down the flow of water and reduce the pressure on drainage systems in times of high flow.

How much water do I need to store?

The tank is often the most expensive part of the system and choosing the right size is key to minimising costs. The tank size needs to be a balance of cost and storage capacity. The tank should also overflow at least twice a year to flush out floating debris.