Rainwater for your garden, on tap
The Carat Garden Comfort system collects the rain that falls on your roof and stores it in an underground tank, ready for watering the garden and outdoor cleaning. It’s a complete package for homeowners, self-builders and installers: tank, filter, pump and hose connection boxes, chosen to work together. At 2,700 to 6,500 litres, it suits larger gardens and properties that want plenty of stored water.
How it works
See it in action: How does the GRAF Garden Comfort system work? (video)
Rain runs from your downpipes into one pipe and into the tank. On the way in, it passes through a basket filter that keeps leaves and debris out. A pressure-sensitive submersible pump sits in the tank. When you open a tap or hose valve, the pump starts and supplies water under pressure; when you close it, the system re-pressurises and the pump switches off. The pump restarts automatically and has dry-run protection. The pump draws water through a floating intake.
Choose your size
The Carat tank is made from 100% recycled plastic and is installed with gravel backfill rather than concrete, which makes installation simpler and saves around £60 per cubic metre. As a European market leader, the Carat system is recognised for its quality.
| Capacity | Length | Width | Total height (with Maxi dome) | Weight |
|---|---|---|---|---|
| 2,700 litres | 2,080mm | 1,565mm | 2,010mm | 120kg |
| 3,750 litres | 2,280mm | 1,755mm | 2,200mm | 150kg |
| 4,800 litres | 2,280mm | 1,985mm | 2,430mm | 185kg |
| 6,500 litres | 2,390mm | 2,190mm | 2,710mm | 220kg |
All sizes have an 800mm tank dome. Choose a pedestrian lid for lawns and garden areas, or a vehicle lid if the tank will go under a driveway.
Useful links
- Prefer a shallow-dig tank, or need a smaller size? See the Platin Garden Comfort system (1,500–7,500 litres)
- Want rainwater for toilets and the washing machine too? See the Carat Direct system
- Add a Digital Level Indicator to see how much water is in the tank
- Tank going in deeper? Add an Extension Piece
- Not sure which system you need? Read our guide: Comparing rainwater harvesting systems: direct, indirect and garden-only
- Work out the right tank size with our rainwater harvesting tank size calculator
Images are for illustration; components may be upgraded or replaced with equivalent alternatives.
