Read more about the importance of filtration in a rainwater harvesting system

Read more about the water quaity from of our rainwater harvesting systems.

Not sure which tank you need?
Use our calculator to find out.

Learn about looking after a rainwater harvesting system.

RainSava Classic
HIgh quality, the best filtration, and leading components at an affordable price
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Rainsava Classic System Diagram
  • Direct feed system
  • Easy maintenance (filter is accessible from ground level)
  • BS8515 compliant (tank is fitted with an anti backflow and rodent guard)
  • Quality brand automatic pump (built in start/stop)
  • Fast mains top up (44l/min)
  • Cleanest water possible due to:
    • Advanced Wisy Vortex filtration removing debris without allowing it to degrade on a horizontal filter mesh
    • Pre-tank Filtration to 0.28mm
    • Floating suction set with 0.3mm mesh filter
BS8518 Compliant Rainwater systems
BS8518 Compliant
Easy to clean filter
Easy to Clean
0.2mm Fine Mesh Filter
0.28mm Mesh Filter

The RainSava domestic Classic is our basic Rainwater system for toilet flushing and watering the garden. It utilises a main brand (DAB) submersible automatic pump to deliver water to the toilets, washing machine and outside taps. Combined with the WISY mains water top up, it offers the home owner a system that functions well, but without the low energy and separate pump/pump control that the RainSava Eco Pro provides. The RainSava Classic’s automatic pump has a built in pressure switch which turns the pump on as soon as the pressure in the pipe drops (when a toilet is flushed or outside tap opened). In the event that the tank runs dry, there is a mains back up that feeds water back to the tank to keep it at a minimum level for uninterrupted supply to the toilets.

RainSava® GRP Tanks

UK made tanks manufactured to BS 4994 from high grade GRP; 100% glass fibre / resin mix with no fillers. These tanks are manufactured to our own specification to comply fully with BS 8515. This includes our unique Multisiphon overflow trap with built-in backflow protection.

Note: It is a requirement of the British Standard for rainwater harvesting that all rainwater tanks are protected against backflow. Most tanks are supplied without this feature, so it has to be added by the installer downstream of the tank itself. Our RainSava® tanks are always fitted with backflow protection.

Tank Volume (Litres)Nominal length (mm)Nominal diameter (mm)Weight (kg)
15001600122090
200021001220130
240023501220150
300020001520180
350023001520190
400026001520200
500030801670240
600027001840260
750033501840300

Other sizes are available, including large tanks for commercial projects up to 100,000 litres.

NB. All GRP tanks are built to order with the ability to have the inlet invert as deep as 1.2m, but can be made to accommodate greater depths if necessary. Before ordering a tank, check what depth your inlet will be to make sure the tank is correct for your installation. Tank necks can always be cut down on site if needed.

HINT: It is good to be shallow with the tank, but the pipe depth is governed by the location of the tank and distance the pipes have traveled in the ground rather than the type of tank. Most UK water pipes are buried at 600-900mm.

Low Profile Shallow-Dig Tanks

In some situations it may be desirable or beneficial to use a shallow tank (e.g. in high groundwater conditions or hard rock ground). For these installations we offer a range of low-profile tanks. These are excellent for certain situations, but are manufactured from a costlier material and imported from Germany so are naturally more expensive.

Also note that these tanks do not include backflow protection, unlike our GRP tanks.

Tank Volume (Litres)Nominal length (mm)Nominal width (mm)Nominal height (mm)Weight (kg)
15002400120073580
300024002400735160
5000296022201035250
7500334023101240310

Read more about the importance of filtration in a rainwater harvesting system

Read more about the water quaity from of our rainwater harvesting systems.

Not sure which tank you need?
Use our calculator to find out.

Learn about looking after a rainwater harvesting system.