1800 Litres Direct Pressure Underground Rainwater Harvesting System

£2,100.00 £1,750.00


Lead Time
3-5 working days
Delivery Cost
£120.00 + VAT


More Information
Height - mm 1250
Width - mm 1260
Length - mm 2080
Weight - kg 75
WRAS Approved No
Capacity - Litres 1800
Capacity - Gallons 395
Construction Material Polyethylene
Suitable for Drinking Water No


This complete 1800 litre direct pressure rainwater harvesting system is ideal for collecting and storing rainwater to use in your home for tasks such as flushing the toilet, washing clothes or washing dishes. The 1800 litre system is suitable for smaller installations such as a 2 bedroom house.

The Direct Pressure system works by supplying water directly to the point of use, for example when a toilet is flushed the pump starts running and rainwater from the tank is pumped to refill the cistern. The pump automatically stops once the pressure in the pipework has been restored. Should the rainwater in your tank reach a low level, a small amount of mains water is sent to the rainwater tank, therefore leaving maximum capacity available for the next rainfall.

This system includes:

  • 1800 Litre polyethylene tank 
  • Pedestrian rated telescopic neck with lid
  • Push fit DN 100 drainage connections
  • Pre-fitted Compact filter with calming inlet
  • Submersible pump

1800 Litre Tank

The tank is manufactured in the UK from virgin Polyethylene and is used mainly for storing harvested rainwater, however it can also be used for storing water from other sources such as springs and wells.

The ribbed design provides added strength and allows for environmentally friendly pea-gravel backfills, eliminating the need for concrete bases and backfills to be used in most installations.

The tank has been designed to ensure optimal strength and is shorter in height compared to other tanks on the market today. This means that a shallower hole is needed to accommodate the tank (this can be as much as 500mm less).

The tank features a large 600mm access which allows for inspection and maintenance of the tank and its contents.

The telescopic neck and lid push fits into the neck of the tank and a rubber seal towards the bottom ensures a tight fit. The telescopic part of the neck can be extended by up to 300mm and can be tilted in any direction by up to 5 degrees.

In-Tank Filter

As standard, a compact 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 compact filter is suitable for roof areas up to 150m².

Submersible Pump and Controls

The pump delivers approximately 4 bar of pressure and up to 3500 litres/hr of flow and is automatically started at the point of use. The pump also has dry run protection as standard.

The pump is suspended from a pre-fitted hook in the neck of the tank by a stainless steel chain which allows the pump to be lifted out for maintenance. A large handle allows easy lifting when necessary.

Each system is supplied with the filter, calmed inlet and drainage connections pre-fitted inside the tank. Also supplied are all non-standard plumbing fittings, a roll of 32mm MDPE (15 metres), marker tape and ID packs.

Important Delivery Information

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

Delivery is made via a pallet service with a tail lift, and once unloaded from the delivery vehicle, it is the customer’s responsibility to move the tank.