Additional Information

Site Information

  • 800L space saving waterbutt, rainwater tank. Colour: Black. Free Delivery*
  • 800L space saving waterbutt, rainwater tank. Colour: Granite Grey. Free Delivery*
  • 800L space saving waterbutt, rainwater tank. Colour: Sand. Free Delivery*
  • One of three brass threaded ports (bung removed) for connecting taps or linking to other water tanks.
  • Sand Coloured Wall Tank with Filter Collector colour choices
  • Showing how more than one Wall Water Tank can be linked together (note upgraded metal taps).

800 Litre Rainwater Tank


Prices include VAT


Product Description

800 Litre Water Tank - 800 litre Rainwater Wall Tank / Water Butt

The original, durable, slimline 800 litre water tank from 3P Technik for space-saving storage of a larger volume of rainwater.

Free Delivery Mainland UK .

The 800L Rainwater Tanks are ideal for medium scale Rainwater Saving or Harvesting, and specified by professionals where bulk storage of rainwater and a compact footprint are required. They can also be used where mains water needs to be stored for emergency use in the case, for example, of a fire as a Fire Water Tank. A step-up from the water butt 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 home, garden or workplace.

The water tank footprint is perfect for use where site space or access is limited. With it's small base of just 80cm x 60cm they can fit just about anywhere around the outside of a modern dwelling space. The height at 179cm means that it will fit through most building doorways.

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

Ideal for storing rainwater that could be supplied to, 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.

Our slim 800 litre water butt is available in four attractive matt colours - Black, Granite Grey and Sand. It comes with an accessory and fitting kit for a quick and easy start to harvesting rain water which includes Hi-Flow plastic tap, metal wall fixing bracket, multi holesaw set, heavy duty thick rubber grommets and screws.

How to collect Rainwater

We recommend connecting your water tank to the downpipe of your roof guttering system using the 3P Filter Collector. This rainwater filter is also a rainwater diverter with built in overflow and winter "off" setting to stop collecting water. It is everything you need for collecting water from your downpipe and filter any debris before transferring the water into the tank. It is offered at a special price when purchased with the Wall tank.

To purchase a rainwater diverter along with your tank, just select a colour to match your downpipe to include the filter collector in your order (1 sent with each wall tank. If no filter collector is required select "none").

This filter collector connects your tank directly to your downpipe positioning your wall tank approximately 9-13cm from the edge of your downpipe (depending on the diameter of your downpipe and which size connection hole you choose to make). You can position the Wall Tank further away from the downpipe using our Long Link Kits available in 3 lengths; 1m, 2m and 5m.

How to link water tanks together

If you already have a wall tank (or other water butt with a 3/4 inch BSP female threaded connection point near the base of the tank) you can purchase a 3/4" Tank to Tank Connection Kit.

This unit is also the base unit for our Wall Tank Rainwater Systems, fully thought-out and assembled sets to serve a variety of purposes. If you have need of a complete and integrated pumped-system then do pop over to our Wall Tank Systems, page and have a look.

Technical Information

  • Capacity: 800 litre water tank
  • Space saving footprint: W:80cm D:60cm H:179cm
  • Three 3/4” inset brass threaded connection points (1 tap point for a watering can, 2 x interconnection or drain down points at the base)
  • Material: High-quality UV protected polyethylene
  • Wall thickness: 9mm
  • Shot weight: 36kg
  • Recommended rainwater diverter: 3P Filter Collector


Included Components

Each Wall tank is supplied with an accessory and fitting kit which includes:

  • Hi-flow anti-glug 3/4" plastic tap (to purchase an additional metal tap in either a brass or chrome finish, please visit our metal garden tap page),
  • Multi Hole-saw Set,
  • Rubber Sealing Grommets,
  • Wall fixing bracket and screws.

Other Options

The 800L Wall Tank is the base unit for the 800L Rainwater Harvesting System and 1600L Rainwater Harvesting System.


Spare or replacement:


The wall tank comes with free delivery to UK Mainland addresses (prices to other places is worked out based on your postcode before checkout).

The water tank will arrive on a pallet. Our courier company will call you to arrange a delivery date and time convenient to you. They will unload the pallet from the vehicle for you and, where access is possible, move the pallet to a convenient place for you to unload the tank from the pallet.

Other Details

80 x 60 x 179cm

Product Reviews

Write Review

  1. Excellent product 5 Star Review

    Posted by on 15th Feb 2021

    Have had 2 in the back garden for around 10 years, still in great condition after constant use April to October every year watering veg patch and greenhouses in particular. Now adding a third for the front garden. Ordering was easy and delivered in 2 days.

  2. A good robust tank 4 Star Review

    Posted by on 2nd Jun 2020

    This is the second tank I have purchased. I was surprised it was not provided with a tank water level gauge, as was the first tank. I was told the gauge was part of the pump package and not part of the tank package!

  3. Great Product 5 Star Review

    Posted by on 14th May 2020

    & the service & advice from Celtic before purchase was spot on - many thanks. (now just need some rain!)

Find Similar Products by Category

Customers also viewed

Related Products