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Rainwater harvesting for domestic use

WPL's below ground rainwater harvesting (RWH) systems are the intelligent way to cut your water bills and help the environment, replacing up to 50% of mains water usage in and around the home.

Designed to the highest standards, the RainRetain Premium range consists of two complete systems - one for the home and one for the garden - in a range of sizes to suit different volume requirements.

Why choose RainRetain?

  • Can help reduce your domestic water bill
  • Designed for simple operation and easy installation - ideal for the self-builder
  • Easy installation at any angle, thanks to rotating turret on the neck of the tank
  • Low visual impact, thanks to telescopic lid that can be tilted to suit the ground level
  • Tanks are made of Duralen, a recyclable material which is tough, stable and lightweight
  • Robust design does not require concrete back fill and requires only a small excavation area compared with other tanks
  • Lightweight tank can be supplied in two halves for simple installation
  • High water table system available, enabling installation in groundwater or cohesive soil if needed

Only at WPL

We will do everything we can to ensure that your RainRetain system meets your needs - from friendly advice from our customer service and technical teams to ongoing after sales support. Our service includes:

  • Initial site survey to ensure the right specification for your site and circumstances
  • Full technical support, including installation advice and aftersales care

RainRetain Home System

This ingenious system uses cutting-edge pump technology to run alongside the mains water supply into your house, switching automatically as required between stored rainwater and mains water. Thanks to a very efficient, self-cleaning filter it has a water yield of more than 95%.

When the holding tank is running dry, there is a small automatic charge of mains water into a separate storage tank. This ensures that the system will never run dry, but also that there is no mains water used unnecessarily once the main tank is filled with rainwater again.

RainRetain Home System includes:

  • Dry, wall-mounted pump control unit with automatic mains switch
  • Pump delivers rainwater to appliances at mains pressure
  • Equal wall thickness throughout the tank makes it stable, strong and reliable
  • Tank is made from Duralen, a recyclable material
  • Lightweight tank can be supplied in two halves for restricted sites
  • Wall duct DN100
  • Floating water extraction unit
  • PE suction pipe 12m


  • Toilet flushing
  • Laundry
  • Garden irrigation
  • Car cleaning
  • General cleaning

RainRetain Garden System

This system uses a combination of filter and a pump to supply rainwater for garden irrigation, car washing and general cleaning. The highly efficient pump is pressure-sensitive to ensure that electricity consumption is kept to a minimum, and has a 100% water yield.

RainRetain Garden System includes:

  • Lift-out filter insert for easy cleaning
  • Submersible or dry-mounted suction pump
  • Easy hose connection in tank lid, with lift-up flap
  • Equal wall thickness throughout the tank makes it stable, strong and reliable
  • Tank is made from Duralen, a recyclable material
  • Lightweight tank can be supplied in two halves for restricted sites
  • Floating water extraction unit
  • Water hose extraction unit
  • Pressure hose 10m


  • Garden irrigation
  • Car washing
  • General cleaning

High Water Table System

If you are building in an area with a high water table (HWT), you will need our HWT tank:

  • Available on both Home and Garden packages
  • Four tank sizes - 1500, 3000, 5000 and 7500 litres
  • Tanks can be joined in series for higher capacity
  • Can be installed in groundwater or on rocky ground
  • Optional vehicle bearing dome shaft for use under driveways
  • Telescopic lid can be tilted to suit ground level for low visual impact

Optional extras for Home and Garden Systems

Depending on the specific requirements of your site, the following extras are available:

  1. Vehicle loading - telescopic dome shaft with cast iron lid for installations under drives
  2. Extension collar - for even deeper inverts (not available on HWT system)
  3. Pedestrian loading - maxi telescopic dome shaft with PE lid, for tanks needing deeper installation
  4. RainRetain Premium Home Booster Pump - additional submersible suction pump kit for home system tanks installed further than 8m from the main pump

Rainwater Harvesting Accessories