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Wall Tank Systems - Domestic Rainwater Harvesting Kit

3P Technik


Prices Include VAT


Prices Include VAT

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Rainwater Harvesting Kit - Expandable System for Domestic Rainwater Harvesting

The Wall Tank System is truly a sustainable solution to domestic rainwater harvesting. It combines the awesome power of the SteelPump XAJE80P garden pump and the best in slim and sleek storage of rainwater, the 800L Wall Tank.

These rainwater harvesting kits are the way to go for 'medium scale' Water Harvesting. They include:

  • 1 or more 800L wall tanks (choose from options above) with high flow plastic taps,
  • Rainwater filter and diverter for connecting the tank to your water storage tank,
  • Portable Garden SteelPump with multi-hosetail adaptor for connecting to hose or pipes,
  • Tank to Pump connector with ball valves for easy connection,
  • Tank to Tank connectors (where required),
  • Wall tank level gauge.

Free economy delivery to mainland UK.

800L Wall tank

Specified by professionals where bulk storage of rainwater and a compact footprint are required. A step-up from the water butts sizes, the Wall Tank enters into the world of the true rainwater storage 'tank' and is perfect for a vast range of uses - be they in the garden or for the home. Their footprint is the key, with a small base of just 80cm x 60cm they can fit just about anywhere around the outside of a modern dwelling space. 

Available in three attractive matt colours - Granite, Sandstone and Black and are offered as either single tanks systems of 800L, or as multiple-tank integrated systems.

When placed against a wall, space must be provided to allow the tank to deflect once filled without touching the wall. 


These multiple units work together as a single-system, but comprise multiple tanks so, when ordering, please just select the overall capacity required, NOT the number of tanks, as the "Quantity" entry means the number of complete WHOLE systems you require.  

Portable SteelPump

The XAJE80P is a high quality SteelPump jet pump, with stainless steel motor body. It is a water-proof, automatic (with electronic flow control), self-priming, 0.6KW unit running at 4.5 Amps and is best placed in a covered environment so that it can be protected from frost. The electronic flow control responds to the pressure in the outlet pipe - as the user draws water by opening a tap or similar, the pump starts, then cuts out automatically after. The X-AJE P series is designed for pumping clean water only and the systems come complete with a Filter Collector to ensure the integrity of the water in the tank. The professional build quality incorporates high quality oversized steel bearings, ceramic-graphite shaft seal and reliable electronics, making it suitable for demanding applications and high-duty cycles. Software in P series pumps is optimised for garden or irrigation use and is very safe in garden applications. As the pump is totally water-proof (submersible) it is therefore very safe electrically where children or animals may be present and in the prevention of general accidents. 

SteelPumps (unlike many others on the market) are designed to last and are repairable - all of the components from the capacitor to the last nut or bolt can be replaced - so truly a sustainable pump.

Downpipe Filter/Diverter

Comes complete with the class leading Filter Connector for direct connection to a downpipe  (please contact us if you would like to connect the wall tank further from your downpipe so we can supply you with the correct length of hose). This downpipe filter is everything you need to collect rain water from the downpipe and filter out any debris before transferring the water into the tank. When correctly installed, it also acts as an overflow to ensure that when your wall tanks are full, the rainwater continues back down the downpipe.

Pump to Tank Connector

This superb connector allows the tank or pump to be shut off without any loss of water. The connector hose can then be easily disconnected at either end. Complete with two flat seals in brass, 1m of quality flexible PVC hose and brass shut off ball-valve. It connects the 3/4" BSP tank port to the pump's 1" BSP threaded inlet.

The Wall Tank Systems are especially ideal for storing and pumping out rainwater at pressure which could then supply, for example; utility rooms, wash-down areas, workshops (for water-reliant tools), toilet spaces, or maybe even under a garage or carport for cleaning the car and watering the garden. Not forgetting that rainwater is softer than main-supplied water and is ideally used around the house in hard-water sensitive appliances or for cleaning glass. The keen gardener with a poly-tunnel would also find this an ideal size for feeding irrigation systems. 

Wall Tank Level Gauge

It's easy to see how much water is stored in your wall tanks with this easy to fit level gauge. Simply fit it against one of the wall tanks and connect the clear pipe to one of the drain down threaded connections of any of the wall tanks via the threaded elbow joint.

Free economy delivery to mainland UK. 

How do you extend the Wall Tank System?

If you are unsure how much rainwater you need to store, it is very easy to extend the wall tank system at a later date. Once you have your base unit, you can purchase another 800L Wall tank and Tank to Tank Connection Kit. If you suspect you may want to extend the system in the future, it will be advantageous to purchase a 3/4" mini ball valve with your original tanks and install it into connection point on the end tank, so that you don't have to drain down your system when you do purchase extra tanks.

Technical Information

  • Small footprint. Dimensions: W800mm x D600mm x H1790mm. 
  • Made from high-quality polyethylene, up to 9mm wall thickness.
  • 800 litre capacity water-tank, sold as single or multiple units to make up whole capacity.
  • 0.6KW XAJEP SteelPump garden water pump with multi-hosetail outlet, with a huge 40m lift - easily capable of shifting water anywhere required, within reason.
  • Suitable for large-scale rainwater harvesting where underground systems are inappropriate or undesirable.
  • Can be fitted anywhere from alongside a garden path to a basement or cellar utility room.
  • Modular design allows for installation servicing multiple occupants or businesses.
  • Includes also, a Filter Collector and Pump-to-Tank Connector.
  • Tank To Tank connectors (as required).
  • Tank level gauge.
  • Connection Points (per tank):
    • 3 x ¾" BSP brass threaded ports as; 1 x tap point for watering can & 2 x interconnection or drain down point at base.


Supplied with an accessory and fitting kit which includes:

  • Hi-flow anti-glug 3/4" plastic tap(s)
  • Rubber Grommets
  • Wall fixing bracket(s) and screws

Guides and ideas

A bit undecided about what options are available to you?

Then have a look at our Rainwater Harvesting FAQs and have a read of our informative guides