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Carat Garden Comfort Rainwater Harvesting System 2700-6500 Litres
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Carat Garden Comfort Rainwater Harvesting System 2700-6500 Litres

£2,277.91£2,920.74 inc VAT

The Garden Comfort system is designed for irrigation and outside cleaning purposes.


FREE Delivery by Tuesday, 28 May, 2024.


Protecting you


How does the Carat Garden Comfort Package work?

Rainwater is collected from the roof of the property and fed into the underground tank via the downpipes. On entry to the underground tank, the water passes through a filter to prevent any debris from going into the tank.

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


Why choose the Carat Garden Comfort System?

  • Innovative Gravel Backfill: Say goodbye to expensive concrete installations. Our system utilises gravel backfill, significantly reducing your installation costs by around £60 per cubic metre.
  • Flexible Installation Options with Vehicle Loading Lid: Limited garden space? Our vehicle loading lid allows for driveway installation, making it a versatile option for any home.
  • Eco-Friendly Design: The underground tank, made entirely from 100% recycled plastic, reflects our commitment to environmental sustainability.
  • Trusted Across Europe: As a European market leader, the Carat system is recognised for its quality and effectiveness in rainwater harvesting.
  • Convenient and Free Delivery: We offer hassle-free, free delivery across the UK mainland.
  • Advanced Water Management Technology: Equipped with an automatic submersible pump, the system includes features like automatic restart and dry-run protection, ensuring efficient water usage and reducing the need for maintenance.

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

What’s included

Supplied by Graf

CARAT complete package Garden Comfort 2700-6500 litres, comprising of:

  • CARAT tank dome Maxi black, with sealing set DN 100
  • CARAT telescopic dome shaft Mini green, with PE-lid, for pedestrian loading/or vehicle loading
  • CARAT Filter package 2 Garden, carat basket filter/inflow stilling system/overflow siphon/Spannfix – DN 100
  • Pump package Garden Comfort
  • 25m roll of rainwater harvesting b/g pipe, (25mm, with fittings)
  • Internal hose connection box
  • External hose connection box

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 or soakaway

System Benefits

• Simple & quick to install
• Submersible pump supplies harvested rainwater on demand to external taps, internal and external hose connection boxes
• Water can be extracted using an internal and/or external hose connection box for standard irrigation purposes

Product Dimensions, Levels & Weights

Carat Tank Dimensions & Weights (2700L – 6500L)

Carat S 2700L Mini | Download
Carat S 2700L Maxi | Download
Carat S 3750L Mini | Download
Carat S 3570L Maxi | Download
Carat S 4800L Mini | Download
Carat S 4800L Maxi | Download
Carat S 6500L Mini | Download
Carat S 6500L Maxi | Download

CARAT RS-Series Installation and maintenance instructions | Download
CARAT Tank Levels Mini Dome | Download
CARAT Tank Levels Maxi Dome | Download

Mini & Maxi Lid Dimensions

PE Mini Lid (Pedestrian Loading 371010) | Download

PE Maxi Lid (Pedestrian Loading 371011) | Download

Vehicle Loading Lid (371052) | Download

Extension piece options

Extension Sleeve (371003) | Download

Extension Sleeve (371015) 1000mm | Download



GRAF Carat S RWH Brochure | Download

Data Sheets

Carat-S Garden Comfort Package | Download


Carat Garden Schematic Layout | Download

Installation & Commissioning

This informative guide covers the following:

  • Loading information
  • Tank coverage heights
  • Excavation dimensions
  • Technical & general data
  • Installation & Assembly

Read the Guide | Download
Read the Guide (Tank Only) | Download

Service Provider Support

Graf UK has a national service provider network of contractors who can offer various services including the installation of our tank systems.

Coming Soon: New UK map with the service provider/installer contact details.

Delivery Information

Please note the following regarding Graf UK deliveries

We’re still delivering to our customers safely via our own delivery vehicles & drivers in the main, using external hauliers when required.


This gives us much greater control & flexibility over our deliveries.


All orders are typically delivered within 5-7 working days from receipt of order, however during this time due to UK-wide disruption, some deliveries may take a little longer and we would still aim to deliver within 10 days.

• Delivery lead time is 5-7 working days on all orders unless otherwise advised.
• Price includes delivery to mainland UK.
• Please check for deliveries into Cornwall, Mid & Northern Scotland & Isles as additional delivery charges may be applicable.
• We cannot currently provide a tracking number for all orders but can accept customer enquiries by phone.
• Off-loading by the customer unless agreed otherwise.
• Tanks are generally strapped to a pallet for forklift off-load, slings can also be used.
• Please advise if there is restricted access to the site or special delivery instructions.

Additional Items