10000 Litre GRAF CARAT XL Direct Underground Rainwater Harvesting System (Home & Garden)

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Customer To Offload Delivery | 7-10 Days
GrafSKU: G70139 / G70140

£3,440.00 exc. VAT
Sale price£4,128.00

Tax included



The Graf Carat Direct system is designed to supply water to both the home and garden, supplying WC’s, washing machines, irrigation and for outside cleaning purposes.

Rainwater is collected from the roof of the property and is fed into the 10,000 litre underground rainwater tank via the downpipes. On entry to the tank, the water passes through a filter, to prevent any debris going into the tank. With this system, mains water is supplied to the underground tank when the rainwater level is low (via the mains water back-up unit).  Therefore as long as there is mains water your tank will not run dry! The operation of this unit is controlled via a float switch.

There is also a pressure-sensitive pump located within the underground tank. When a valve or tap is opened, water will be pumped under pressure until the valve is closed, allowing for the system to repressurise turning the power off to the pump.

A CARAT Mini green telescopic dome shaft, with PE-lid, is supplied for pedestrian loading (an option with vehicle loading lids is available).

  • Simple & quick to install
  • The submersible pump supplies harvested rainwater on-demand to WCs, washing machines & external tap
  • Mains water back-up unit tops up the water level in the Carat tank when rainwater levels are low to guarantee continued water supply
  • The quiet & conveniently sized mains water back-up unit will fit in a kitchen or utility cupboard for very low visual impact
  • Innovative float sensor detection on the mains water back-up unit ensures that the underground tank is kept supplied with mains water but only the amount necessary to maintain supply to toilets and washing machines, leaving as much volume as possible in the tank to collect rainwater when available


  • GRAF CARAT XL 10,000 Litres plastic underground tank
  • Tank dome Maxi, with DN150 pipe connections
  • Mini telescopic dome shaft, with PE-lid (for pedestrian loading)
  • Suitable for vehicle loading (if ordered with optional cast iron lid)
  • Optimax-Pro Filter Internal DN150
  • 25m Roll of rainwater harvesting pipe (25mm, with fittings)
  • Submersible pump with floating water intake
  • Mains water back-up unit
  • Float Sensor (connected from mains back-up unit to the underground tank)
  • 15 Year Warranty on Tank
  • 2 Year Warranty on Parts

GRAF CARAT S Installation & Maintenance Instructions

To be Supplied by Others:

  • 100mm diameter duct pipe to contain; float sensor cable, power cable for pump, also bringing mains water to underground tank as and when required
  • 100mm diameter drainage pipe connected from downpipes to the inlet at the top of the tank (all downpipes brought into one pipe for connection to the filter)
  • 100mm diameter pipe for overflow from the tank to mains drainage network

      Tank Dimensions:

      Common Applications:

      • Flushing Toilets
      • Washing Machines
      • Garden Irrigation
      • Cleaning cars
      • Washing windows
      • Power washing drive/patio
      • Outside tap and hose

      Watch the Graf Installation Video

      Images are for illustrative purposes only, there is a possibility that certain products may have been upgraded or replaced with equivalent alternatives.

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