The best 100 litre water butts, compared.
Top pick: Bowers Bargains (100l-slim-wb) Best value: Bowers Bargains (100l-slim-wb) – Best value in this set: score 67 at about £39.99, where the extra pounds are a stand and diverter you would otherwise buy, and only if that claim is in the box. Updated 22.10.2026.
A 100 litre water butt is a small rainwater tank for a patio, side return, balcony downpipe, shed or greenhouse in the United Kingdom. You buy it to fill a watering can without drawing mains water. A full 100 litres weighs about 100 kg, so you site the tank once, on a firm level base. You tell a suitable tank by a specification line of about 100 litres, not by the search title alone. A rigid slimline in this size is typically about 32 to 41 cm deep and roughly 92 to 96 cm tall before a stand. A collapsible tank packs flat. Read the included-parts line, because a kit title does not always match the parcel. These kits cite about 68 mm round or 65 mm square plastic pipe. Without a stand, the tap often sits too low for a watering can. RoSPA says to cover or fence off water butts, because a young child can drown in very little water. See the [100 litre water butt buying guide](/hub/garden-watering/100-litre-water-butt/sub/100-litre-water-butt-buying-guide).
A 100 litre water butt is a small rainwater tank for a patio, side return, balcony downpipe, shed or greenhouse in the United Kingdom. You buy it to fill a watering can without drawing mains water.
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Personal buying guide
Question 1 of 2
Where will the tank sit?
Bowers Bargains lists a black 100 litre slimline at 36 × 32 × 96 cm and 5 kg for £39.99, with 4.6 from 23 reviews. The title and a stand line of about 40.5 × 40.5 × 30.5 cm describe a downpipe filler kit, which is the hardware you otherwise add to a butt-only tank. One verified review says the parcel was the butt and a tap, with no stand and no other fittings, so check the box against the title before you cut a downpipe. Other buyers report a sturdy tank, a setup measured in minutes, and no leakage, while one faulty tap was replaced by the seller. The lid catch is a square spigot that one reviewer needed grips to open. Country of origin is given as the United Kingdom, and the spare-part line says 5 years. It is the best value here only if that stand and diverter actually arrive, because the extra £6.10 over the Plant!T butt is paying for the kit claim, on a much smaller review sample.
Pros
Cons
Best for: You want one parcel that claims a stand and diverter, and you will check the contents on the day it arrives.
Less suitable: You want the review depth of a long-running listing, or you already own a stand and a diverter.
Specifications
Common questions
Does the Bowers Bargains set come with a stand?
The title and the bullet dimensions describe a stand about 30.5 cm high. One verified review says the parcel was the butt and a tap, with no stand.
Does the tap leak?
One buyer had a faulty tap replaced by the seller. Another review reports no leakage.
Is it easy to install?
One review says it was set up in a few minutes, then the buyer looked up how to connect the downpipe. Tool-free is not stated.
The Plant!T GN334 is a green rigid slimline listed at 100 litres and £33.89 on amazon.co.uk, with 4.5 from 2,120 reviews. Buyers describe it beside a small shed or in a tight garden, and several say the plastic feels strong if a little water is left in the base. The included-components line is the butt only, so a stand and a downpipe diverter are separate buys if you want a watering can under the tap. Reviews often praise a tap that screws in and holds, and just as often report a drip at the spigot, a poorly drilled hole, or a thread that needed PTFE tape. One buyer says it tipped forwards at about three-quarters full, and another says the green plastic lightened in the sun. The listing’s 10 × 10 × 10 mm size and 1 kg weight are not a credible footprint, so those two rows should be ignored. It is the top pick here because the review sample shows both the useful size and the tap faults, not because the box is a complete kit.
Pros
Cons
Best for: A permanent slimline beside a shed or side return when you will buy a stand and a diverter separately.
Less suitable: You need the stand and downpipe kit in the same parcel, or a tank that packs flat for winter.
Specifications
Common questions
Does the Plant!T GN334 come with a stand?
No. The included-components line is the butt only. Reviewers say they bought a stand so a watering can fits under the tap.
Does the tap leak?
Reviews disagree. Some say the tap fits and works. Others report a drip at the spigot, a poorly drilled hole, or a seal that needed PTFE tape.
Is assembly tool-free?
The listing does not say so. Reviews describe screwing in the tap and, for the downpipe, fittings that are not in the box.
The GJGSW listing is the 100 litre option in a collapsible PVC range, at £49.88, with 4.0 from 3 reviews. The title and the unit count say 100 litres, while the capacity field prints 26 gallons, which is about 98 litres, so the two lines nearly agree and still are not the same figure. Empty weight is 1.4 kg, with a zip lid, a tap, a mesh filter and outlet seals described in the bullets. One UK review says it holds water and suits a smaller garden, and the reviews state no fault. Dimensions and a stand are not given, and the bullets tell you to put it on a flat surface and fold it for storage. It is the dearest tank here, on three reviews, so the fold-flat shape is the reason to look, not a claim that PVC outranks a rigid slimline.
Pros
Cons
Best for: A PVC tank you can pack away, if you accept three reviews and no stated footprint.
Less suitable: You want a rigid wall-hugging butt with a known size and a large review count.
Specifications
Common questions
Does the GJGSW come with a stand?
The listing asks the question and does not answer it. A stand is not in the bullets.
What is it made of?
Polyvinyl chloride (PVC). The empty weight on the listing is 1.4 kg.
Does it fold away?
Yes. The title says collapsible, and the bullets say it folds for storage and should sit on a flat surface.
The Plant!T Flexi Tank is a blue fold-up 100 litre container at 80 × 40 × 80 cm and 1.9 kg, priced at £34.19, with 3.5 from 5 reviews. The title sells it as compact hydroponics storage, not as a downpipe kit, and neither a stand nor a diverter appears in the parts list. Two review texts are stored: one says it does the job, and another reports a leak at the tap connector and calls it a waste of money. Whether a tap is supplied at all is not confirmed beyond that connector mention. Material is not named. It belongs in this comparison as a 100 litre fold-up tank, and it is a weak start if the job is rain off a plastic downpipe into a watering can.
Pros
Cons
Best for: Hydroponics or compact storage where a fold-up 100 litre tank is the point.
Less suitable: A garden downpipe, a watering-can stand, or anyone put off by a reported connector leak.
Specifications
Common questions
Does the Flexi Tank come with a tap?
The parts list does not say. One review reports a leak from the tap connector.
Does it fold away?
Yes. The title describes a collapsible fold-up tank.
Is it a downpipe kit?
No stand or diverter is listed. The title sells it as compact hydroponics storage.
Vision4ever’s green kit is titled as a 100 litre butt with hose, tap and stand at £29.99, and the bullets give 41 × 92 × 41 cm. The listing has no Customer Reviews line and no review text, so there is no UK star rating to set beside the other tanks. A separate included-components block is also missing, which means the hose, tap and stand live in the title rather than in a parts list you can quote. Bullets say it fixes to a drainpipe and that the holes are internally threaded. Material is described as recycled without a polymer name, and the shape field says round while the size is a slim rectangle. Country of origin is India. At the lowest price in this set it is a specification to verify on the live amazon.co.uk page, not a reviewed tank you can judge from buyer complaints.
Pros
Cons
Best for: Comparing a low kit price when you will confirm the live box contents before you rely on a stand or a hose.
Less suitable: You want buyer evidence on leaks, stability, or whether the stand arrives.
Specifications
Common questions
Does the Vision4ever kit come with a stand?
The title says hose, tap and stand. A separate parts list is not on the listing.
Are the tap holes already threaded?
Yes. The bullets say internally threaded holes for taps and connections.
How big is it?
The bullets say 41 × 92 × 41 cm and a 100 litre capacity.
Scores use the five amazon.co.uk listings kept for this page, captured on 19 October 2026. There is no laboratory test. Each block is scored from 0 to 100, then weighted. Amazon stars are 30%. A missing review line scores 0 on that block, and 4.5 becomes 90. Review volume is 25%: 2,000 or more scores 100, 20 to 99 scores 45, 5 to 19 scores 25, 1 to 4 scores 15, and none scores 0. Listing clarity is 20%: a stated capacity, a credible size, and an included-parts line you can quote. A 10 × 10 × 10 mm row and a disputed kit title are deductions. Review sentiment is 15%. Repeated leaks, a missing stand, or a connector leak reduce that block. No review text is not treated as praise. Price against what the listing actually documents is 10%. The weights below sum to 100. Applied scores are 81, 67, 50, 49 and 24. In sentences this page says top pick and best value. The best-value badge is the kit-shaped listing only if the stand and diverter claim is what the extra pounds are paying for, and a listing with no review line does not take it.
Amazon stars
30%The amazon.co.uk star line, scored 0–100 then weighted at 30%. No review line scores 0. A 4.5 becomes 90 on that block. Stars are not a leak test.
Review volume
25%2,000 or more reviews score 100 on this block, 20 to 99 score 45, 5 to 19 score 25, 1 to 4 score 15, and none scores 0. The block is weighted at 25%.
Listing clarity
20%Capacity, a credible size, and an included-parts line you can quote. A 10 × 10 × 10 mm row and a kit title that a review disputes are deductions. Weighted at 20%.
Review sentiment
15%Repeated leaks, a missing stand, or a connector leak reduce this block. No review text is not treated as praise. Weighted at 15%.
Price against the listing
10%Price is scored against what the listing actually documents, not against a title that the reviews do not support. Weighted at 10%.
Choose by the capacity line, the footprint, and the included-parts line before the shelf price. A kit title is not the parcel. Prices below are amazon.co.uk lines from 19 October 2026. There is no laboratory test.
A 100 litre water butt is a small rainwater tank for a patio, side return, balcony downpipe, shed or greenhouse. You use it to fill a watering can. You do not use it to run a sprinkler or to water a lawn. A full tank holds about 100 kg of water, so it stays on a firm level base. Waterwise says to empty it when freezing is a risk, and to put it on a base that can carry the full weight. Check capacity on the specification line, not the search title.
Keep listings that state about 100 litres. Twenty-six gallons is about 98 litres. Tanks of 200 litres and above are a different category, with a heavier full weight.
One verified review of the Bowers Bargains set received the butt and a tap, with no stand. Vision4ever puts hose, tap and stand in the title and does not give a separate parts list. Read the included-components line.
Without a stand the tap often sits too low for a watering can. Kit makers cite 68 mm round or 65 mm square plastic pipe. Cast iron and odd sizes are a stop. Do not put washing-up water in the butt, and do not run a sprinkler off 100 litres.
Use the specification line. A slimline here is about 32–41 cm deep and roughly 92–96 cm tall before a stand. Collapsible PVC folds flat and needs a level base. A flexi hydroponics tank is 100 litres of storage, not a downpipe kit. The included-parts line decides whether a stand, a tap and a diverter are in the parcel.
Plan for 68 mm round or 65 mm square plastic pipe. Cover the tank, because RoSPA warns that children can drown in very little water. A 4.5 from 2,120 reviews still includes tap leaks. A handful of reviews, or none, does not outrank that sample. Price on 19 October 2026 sat between £29.99 and £49.88, and it comes after those checks.
Three typical situations, each with a recommendation from this comparison.
You want a permanent slimline for pots, and you will buy a stand and a diverter yourself. The Plant!T GN334 is a green rigid 100 litre butt at about £33.89, with 4.5 from 2,120 reviews. The included-components line is the butt only. Reviews often mention a tap that holds, and just as often a drip or a hole that needed PTFE tape. Skip it if the stand must be in the same parcel.
You want a title that claims a stand and a downpipe kit, and you will open the box before you cut a pipe. The Bowers Bargains set is a black slimline at 36 × 32 × 96 cm, about £39.99, with 4.6 from 23 reviews. One verified review received the butt and a tap, with no stand. Skip it if you already own a stand and a diverter.
You may need the tank to fold flat between seasons. The GJGSW is a collapsible PVC tank sold as the 100 litre option, at about £49.88, with 4.0 from 3 reviews. The capacity field says 26 gallons, and no footprint is listed. Skip it if you want a rigid wall-hugging butt and a large review count.
In this set the top pick is the Plant!T GN334: about £33.89, 4.5 from 2,120 amazon.co.uk reviews, a green rigid slimline listed at 100 litres, score 81. The included-components line is the butt only, so a stand and a diverter are separate buys. Reviews include a tap that holds and, often, a drip, a poor hole, or PTFE tape. The listing size of 10 × 10 × 10 mm is not a real footprint. The best value is the Bowers Bargains set at about £39.99 and a score of 67, only if the stand and diverter in the title are in the box. One verified review received the butt and a tap, with no stand. It has 4.6 from 23 reviews.
Bowers Bargains (100l-slim-wb)
Best value in this set: score 67 at about £39.99, where the extra pounds are a stand and diverter you would otherwise buy, and only if that claim is in the box.
Editorial
Peter F. is the editor for DIY & tools at productscompared.co.uk. Comparisons in this category are checked against amazon.co.uk listings, review evidence and public UK sources.
Guides on what to look for, how to use a product, and common mistakes.
Public UK sources used for hosepipe bans, child safety, non-potable rainwater and garden practice. Listing prices, stars and review counts are the amazon.co.uk lines saved on 19 October 2026. This is not a lab test.
This page contains affiliate links to amazon.co.uk. If you buy through them, we may earn a commission at no extra cost to you. Prices, stars and review counts are the UK listing lines. We did not run a lab test.
