Best Water Butt 2026: £0.24 to £0.71 a Litre

The best value in this ranking by the measure that matters: 210 litres for £58.99, which is £0.281 per litre of storage, with 4.5 stars from 537 ratings — the second-deepest sample here. It is a 57 x 57 x 97cm barrel in black plastic, supplied as a kit with a stand, a tap and a diverter, and it ranks second in Amazon's water butt category.

Price per litre is the number to use here, because every listing quotes a capacity and none of them quotes value. Across this ranking the same job ranges from £0.238 to £0.714 per litre, a factor of three, and the reason is design rather than size: a plain barrel holds the same water as a terracotta amphora and costs a third as much per litre. What the extra buys is how it looks and, occasionally, a longer warranty.

The physics is the other thing worth knowing before choosing: 210 litres of water weighs 210kg, so the butt, its stand and the ground beneath carry a quarter of a tonne when full. This listing gives the dimensions of the stand as well as the butt, which is the sort of detail that shows the maker expects it to be positioned properly. The reviews are brief and satisfied: good item, easy to fit, does the job well, holds water.

The premium option, and the only one in this ranking that offers something a cheaper barrel does not: a five-year warranty. It holds 227 litres for £69.99 — £0.308 per litre, mid-range — in a 60 x 60 x 129cm barrel in grey plastic with a stand, tap, downpipe diverter and child-safe lid in the box.

It is also the only listing here that publishes a believable weight: 7.7kg empty. Two others give 1kg and 2kg for butts of 210 and 100 litres, which are the sort of figures that appear when a field is filled from a catalogue rather than measured. A 227-litre butt carries 227kg of water when full, so the empty 7.7kg is a small part of the load, but it is the number that tells you whether you can lift it into position alone.

The 129cm height is the other practical figure: a butt on a 30cm stand puts the tap around knee height, above a watering can and below a hose reel, which is where the gravity flow in the reviews comes from. Buy this one for the warranty and the stated weight; buy the cheaper 210-litre barrel if neither matters.

The best-rated water butt here: 4.6 stars from 148 ratings with 79 per cent five-star and 2 per cent one-star, the cleanest record in the ranking. It holds 227 litres for £69.99, which is £0.308 per litre, in a green barrel measuring 99 x 60 x 99cm, and it arrives as a kit with a stand, tap, diverter and child-safe lid.

Its shape is why it costs what it does per litre. At 99cm long and 60cm wide it is a low, wide butt — nearly a metre across — where the cheapest 210-litre option is a 57cm square barrel. Wide butts are more stable when full and easier to hide behind a shed; the trade is floor space, and the 99cm width is the dimension to check against the gap you have.

The reviews are enthusiastic and specific: easy to install, great for the back of the garden, strong and sturdy, and one buyer who bought two and reports them both full of rainwater. At £0.308 per litre it is neither the cheapest nor the dearest here — it is the one with the best record, and 148 ratings of evidence is worth more than the 59 ratings behind the 350-litre butt below it.

The most-reviewed water butt here: 800 ratings at 4.5 stars, 69 per cent five-star and 3 per cent one-star, for £33.50. It holds 100 litres in a 36 x 32 x 95cm slimline barrel — 32cm deep, which is the point of the design — and it comes ready to use with a tap and a downpipe filler in the kit. That works out at £0.335 per litre, a little above the best 210-litre barrel here.

Slimline costs money per litre and saves space. Compare it with the 210-litre barrel at £58.99: that is £0.281 per litre, so this small butt pays about 19 per cent more per litre of storage, and in exchange it takes a third of the footprint and fits down the side of a house. For a small garden or a terrace, that is the whole decision.

The reviews are about the practical side: fab, easy to put together, saving my water bills, and one buyer who now waters all their plants from it. At 100 litres a full butt weighs 100kg, manageable on a patio and too much for a balcony — and it takes only about 5mm of rain on a 20-square-metre roof to fill it, which is why the reviews mention how quickly these fill.

The best seller in Amazon's water butt category, and the clearest example of this category's unit problem: the title says 100 litres and the capacity field says 26 gallons. Twenty-six imperial gallons is 118 litres, so two numbers on the same page disagree by nearly a fifth. It costs £33.89 with 4.4 stars from 128 ratings, and it is a 32 x 36 x 95cm slimline barrel in black plastic.

Working out the value therefore takes a decision about which number to believe. At 100 litres it is £0.339 per litre; at 118 litres it would be £0.287, which would make it the second-best value here. The honest reading is that this is the same barrel as the 100-litre slimline below, sold under another brand with a capacity field converted carelessly, and that the seller's own bullet — collect and store up to 100 litres — is the figure to use.

What the ranking does tell you is that people buy it: first place in the category against 800 ratings for the identical barrel below, which suggests ranks move faster than reviews accumulate. The reviews are short and positive: good quality water butt, slim but of a good capacity, easy to put together, does the job value for the price.

The cheapest water butt in this ranking per litre: 210 litres for £49.99, which is £0.238 — 15 per cent below the next best and a third of the dearest 210-litre butt here. It carries 4.2 stars from 104 ratings with 65 per cent five-star and 4 per cent one-star, and it is a 57 x 57 x 97cm barrel with a lid, the same dimensions as the best-value butt in this ranking.

Its weight is given as 1kg, which is not true of any 210-litre barrel: the Harcostar, the only listing here with a believable figure, states 7.7kg for 227 litres. A field like that comes from a catalogue rather than a scale, and it matters because the empty weight decides whether one person can move the butt into position. What is accurate here is the price and the dimensions.

The listing itself is minimal — 210LT water butt and lid, with no kit described — and the reviews fill the gap: complete with tap, delivered promptly, lovely condition. If you already have a stand and a diverter, or plan to buy them separately, this is the cheapest way here to put 210 litres of storage in a garden.

The expensive option among the small butts: £44.99 for 100 litres, which is £0.45 per litre — 34 per cent more than the better-reviewed slimline above and nearly twice the best value per litre in this ranking. It carries 4.1 stars from 159 ratings with 57 per cent five-star and 9 per cent one-star, the highest complaint rate of the slimline group, and it is made from recycled plastic, which is part of what the price buys.

What it does include is a complete kit: a stand, a lid, a tap and a rainwater downpipe diverter with a filter. The cheaper slimline comes with the tap and filler but no stand, so the £11.49 difference buys a stand, a filter and the recycled material.

Its weight field says 2kg, which — like the 1kg quoted on the 210-litre butt — is not a real figure for a barrel with wall thickness. The reviews describe it well: a fantastic product, excellent value, easy to install, very well built and sturdy, which is what recycled plastic buys, since these barrels are moulded in plain shapes rather than shapely ones. At 40cm square and 90cm high it needs less space than any large butt here.

Two 100-litre slimline butts for £66.99, which works out at £0.335 per litre for the 200 litres you receive — the same value as the single slimline kit above, doubled. They carry 4.2 stars from 218 ratings with 59 per cent five-star and 8 per cent one-star, and each is 32 x 36 x 95cm, so the pair needs two narrow spaces rather than one wide one.

Its capacity field says 100 litres, counting one butt rather than the pack: the mirror image of the two-pack of bird feeders in our other ranking, where a listing sold a pair and quoted the specs of one. Here, at least, the price makes it clear that you get two.

The reviews are about the result rather than the product: they blend in nicely, they came with everything needed, and one buyer could not believe how quickly they filled, with plenty of pots and baskets to water. Two butts also solve a problem a single one cannot: with the diverter feeding them in sequence, the first overflows into the second, so a heavy downpour is not wasted once the first is full.

The largest water butt here at 350 litres, and the worst value: £224.95 is £0.643 per litre, 2.7 times the cheapest storage in this ranking and more than twice the best value among the large butts. It carries 4.2 stars from 59 ratings with 60 per cent five-star and 9 per cent one-star, and it is a 77 x 36 x 135cm barrel — narrow and tall, which is how 350 litres fits down a side return — supplied with a tap, a stand, a 450g cleaner treatment and a smart overflow at the diverter level.

What the money buys is a considered kit: the cleaner treatment is a consumable most listings ignore, and the overflow directs excess rain rather than letting it pool at the base. It also buys a 135cm height, the tallest here, which lifts the tap for filling a watering can.

The number to weigh against the price is the weight of the contents: 350 litres is 350kg, more than a third of a tonne, standing on a stand in a garden. Whatever it stands on has to take that load, and at 36cm deep it will often be beside a wall on soft ground. At £0.643 a litre its case is the shape and the kit rather than the storage.