3000 Litre F-Line Shallow Dig Underground Tank

£1,855.00 ex VAT

F-Line Flat Tank 3000 litre underground garden rainwater harvesting system tank. The unique F-Line flat shallow dig tank, supplied ready for use as a garden rainwater harvesting tank. Collect and store cooled rainwater for your valuable garden plants or build a kit for household use.

Complete with shaft, pedestrian lid, filter, overflow siphon and calmed inlet.

SKU: RWFT3000 Category: Tag:


F-Line Flat Rainwater Tank 3000 litre shallow dig underground tank with accessory options.

Why buy this tank?

The F-Line is a high quality, rotationally moulded, one piece rainwater tank that can be installed without the need for concrete, thereby minimising installation costs and supported by our long term 25 year tank guarantee.

The tank comes with a 635mm shaft and pedestrian lid.

The F-Line Tank also comes with an In Tank Filtration pack which includes the filter, overflow siphow and calmed inlet. The set has all the components needed to filter the rainwater as it enters your tank and drain any surplus to your overflow.

The fine filter filters dirt particles, before they reach the tank. The filter cartridge can simply be taken out for maintenance and can be easily cleaned.

Please note that the holes in the image above are not the actual hole locations.

  • Minimal installation depth.
  • Easy and quick to install.
  • Small excavation pit and little earth excavation preserves your garden.
  • Ideal for installation in new or existing properties.
  • Can be installed in ground water up to tank shoulder.
  • Price includes Mainland UK delivery.
  • Ready to locate and simply connect the inlet and outlet.

Easy to install

The F-line flat tank can be installed into much higher water tables than a standard round tank. If you don’t know what your water table will be like in the winter, you’re safer to install a flat tank. The F-Line tanks are flat and the installation depth is 60% less than other rainwater tanks.

The excavation can be up to 70% less, meaning little earth excavation, easy handling and less cost for you! The small excavation pit is easily filled in and your garden will look just like it did before.

Technical Details

Size 1500 3000 5000 7500
Weight Kg 80 170 250 310
Length 1200 2400 2960 3340
Width 2400 2400 2220 2310
Overall Height* 1015 – 1415 1015 – 1415 1350 – 1750 1415 – 1815
Ground to Invert** 335 – 735 335 – 735 335 – 735 330 – 730
Invert to Outlet 162 162 162 162


Size 1500 3000 5000 7500
Length 1600 2800 3360 3740
Width 2800 2800 2620 2710
Overall Height* 1115 – 1515 1115 – 1515 1450 – 1850 1515 – 1915

*Overall height allows for 100mm compacted aggregate

**Using a VS60 (635mm Shaft)

The overall height difference above is because up to 400mm can be cut off the 635mm shaft on site so as to achieve your exact invert level.