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1800 Litres Premium Underground Rainwater Harvesting Garden System

Tank Specifications

Length - mm 2080
Width - mm 1260
Height - mm 1360
Weight - kg 88
Capacity - Litres 1800
Capacity - Gallons 400
Construction Material Polyethylene
Product Code: WAB.1800.P

£1,928.00 (ex. VAT)

£2,313.60 (inc. VAT)

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

Tank Specifications

Length - mm 2080
Width - mm 1260
Height - mm 1360
Weight - kg 88
Capacity - Litres 1800
Capacity - Gallons 400
Construction Material Polyethylene

This 1800 Litres Premium Underground Rainwater Harvesting Garden System has all of the features of the Economy system but adds several extras to increase usability and efficiency. The garden system is ideal for collecting and storing rainwater to use in the garden for a variety of applications. These include:

  • Garden irrigation
  • Washing the car
  • Cleaning windows
  • Power washing driveways and patios
  • Outside taps and hosepipes

The 1800 litre system is suitable for smaller applications, however storing 1800 litres of water will provide an excellent supply of water for use in your garden. 

This system includes:

  • 1800 litre polyethylene tank
  • Pedestrian rated telescopic neck and lid
  • P Series stainless steel submersible pump with float switch
  • Rodent guard
  • Calmed inlet drainage pack with rainwater filter
  • Pump turret
  • Pump lifting chain
  • Floating intake

1800 Litre Tank

The 1800 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. 


  • 1800 Litre / 400 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 with calmed inlet

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.

The calmed inlet slows down the speed the water enters the tank and introduces the water into the lower part of the tank. As a result of this controlled entry, the water does not disturb any sediment at the base and replenishes the supply of oxygenated water throughout the tank, not solely at the top. This keeps the water inside the tank fresher for longer.

Submersible Pump

This system is supplied with a P Series 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.

The pump combines with a float switch to help protect the pump from running dry and potentially causing damage.

Pump Lifting Chain

This allows you to quickly and easily pull the pump up towards the top of the tank for maintenance or inspection purposes.

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.

Floating Intake

A floating intake ensures that no water from either the surface or bottom of the tank is taken into the pump. This means that only clean water passes through the system and is pumped to the 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.