Garantia Green Slim Wall Tank – 330 Litres


FREE Delivery by Thursday, 07 December, 2023.

The 300L Slim Stone wall water tank is a stylish feature for your garden. It allows for high-capacity water storage despite only needing a small space in your garden. This tank comes with a brass plastic tap.

12 in stock

This item: Garantia Green Slim Wall Tank - 330 Litres

12 in stock

1 × Garantia Rapido Diverter (for round downpipes)

20 in stock (can be backordered)

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This contemporary 330L Slim Rainwater Wall Tank in Green is perfect for collecting a large amount of water in a small space and comes with a tap, an 3/4″ inner thread to fit in and accessories.

Ideal for gardens with limited space, this water butt offers a great space saving solution to high capacity water storage. Featuring an extra-large capacity, you will be able to collect plenty of naturally soft rainwater for your garden, without taking up too much valuable outdoor space. This quality water tank is also made from 100% recycled material and is both UV-stable and weather resistant.

Included with this water tank, you’ll also get an Aqua-Quick plastic tap with a stunning brass finish. The Downpipe is not included, but can be bought as an optional extra.

Features and Benefits

      • Discreet Design – Slim and compact, this Garantia Wall Tank won’t look out of place in either urban or rural back gardens.
      • Eco-Friendly – Helping you do your bit, this water butt harvests rainwater for your garden the contemporary way.
      • Make Some Serious Savings –  Mains water is an expensive commodity, so rainwater harvesting is a perfect, money saving alternative.
      • Incorporated Tap –  Making it easier than ever to decant your water, a user-friendly tap is included for your convenience.


      • Modern design
      • High-quality
      • Slim compact shape
      • High capacity water butt
      • Includes brass coloured aqua-quick tap

Product Dimensions:

      • Height – 1820mm
      • Width – 580mm
      • Depth – 370mm
      • Weight – 17kgs

Helpful information on installing your downpipe

The Slim Wall Tank comes with a set up kit for installing your tank to your downpipe.

Note: this is not the downpipe diverter. This needs to be purchased separately – simply select the desired Downpipe Diverter. If you are connecting your tank to a square downpipe, the Square Downpipe Diverter will be required.

  • The water butts do not come predrilled. This product is very easy to use and can be drilled in by anyone. Simply attach the drill bit onto your drill and begin drilling – remember you must drill the hole in the water butt at the same level as the hole in the downpipe!
  • As long as the holes drilled in both the water butt and the downpipe are level, the water butt will continue down the downpipe when the water butt is full.


Delivery Requirements – Please read before ordering!

Due to its size, this item will be delivered on a pallet by one of our haulage companies. They utilise vehicles that are usually larger than a standard courier van.  If you think that our couriers may have difficulty accessing your delivery address, please kindly state this in the delivery instructions, and a member of our team will contact you to make appropriate alternative arrangements.

If you won’t be present to receive your delivery, please ensure that you designate a safe place for the item to be left. Without these instructions, we will be unable to complete the delivery in your absence.

Our haulier will deliver your water butt to your doorstep. Unfortunately, they will not be able to enter the premises and place the water butt wherever you may specifically require it.

Each water butt arrives on a pallet. Our haulier will not be able to remove this once they have delivered the water butt.


Weight 17 kg
Dimensions 370 × 580 × 1820 mm


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FREE Delivery Information

A note to our customers

All of our orders are typically delivered within 1 week from receipt of order, however during this time due to UK-wide disruption, deliveries may take a little longer and we aim to deliver within 10 days.

  • Delivery lead time is 5-7 working days on all orders.
  • Price is included to mainland UK, quotations for highlands and islands available on request.
  • We use a number of different hauliers and also deliver on our own vehicles.  We cannot currently provide a tracking number for all orders but can accept customer enquiries by phone.
  • Decorative water butt orders will be palletised curbside deliveries.  The customer being home to accept the delivery is advised but not essential.


You have 30 calendar days to return an item from the date you received it.

To be eligible for a return:

  • Your item must be unused and in the same condition that you received it.
  • Your item must be in the original packaging.
  • Your item needs to have a receipt or proof of purchase.
  • In order for returns to be approved and refunded, the returns form included in the delivery must be completed.  We can send out an additional or electronic copy of the returns form upon request.

4 Questions about Garantia Green Slim Wall Tank - 330 Litres

  1. hi, is there also a tap connection option on the short side of the tank?


    1. Good afternoon,

      Unfortunately, no the only tap connection available for this tank is as know on the website.



  2. For the third time of asking please tell me the diameter of the hole I need to cut in my cast iron down pipe for your diverter system. The drill cutter you provide will NOT do the job. I am desperate to order and for delivery but I will not order without the information requested. Call me on the number I have previously given when the response to my question I got was ‘I don’t know’


    1. Hi Frederick,

      I do apologies for not receiving the answer you were hoping for.
      The diameter is 44mm.

      If you have any other questions, feel free to be in touch.

      Kind regards,


  3. What dimension access hole is required in the gutter down pipe for tank filling? My drains are all cast iron and not easy to drill.


    1. Hi Frederick,

      The hole saw supplied will not cut a cast iron pipe. You would need a tungston carbide tipped hole saw to do this. Not an easy job!

      Kind regards,


  4. Does this tank require securing to a structure?


    1. Hi Frederick,

      It can stand alone, but we recommend it’s against a wall for stability.
      It does not need securing, unless you are attaching a diverter to the downpipe.
      Once it has water in it below the tap that will act as a weight also.

      I hope this helps.

      Thanks, Gerty