Rank #9 in Best Electric Cool Box 2026: 10 Ranked, and Why the Litre Count Misleads
Crystals 33L Electric Cool Box, 12V DC & 240V AC
Price and rating as shown on Amazon when we collected them. Both change.
At number nine in this guide, the Crystals 33L Electric Cool Box is a thermoelectric cooler that runs from a 12V car socket or a 240V mains plug. It costs £61.90 and carries 4.3 out of 5 from 131 ratings. On the number this category is worst at, the Crystals is at least consistent: 33 litres in the title, 33 litres in the bullet points, 33 litres in the specification, with no second 'gross' figure quietly attached. Nothing in the listing says the 33 litres is measured to the lid or includes the mechanism.
The same listing undermines it slightly. The stated dimensions are 43cm deep, 33cm wide and 46cm high, and those multiply out to roughly 65 litres of physical box. On the advert's own numbers, close to half of what you are carrying around is the box rather than the space inside it. Two other figures are worth knowing before you buy: it cools to a claimed 15°C below ambient temperature, so its performance moves with the weather and the room, and the specification lists a 30-day warranty. Of the 131 ratings, 67 are five stars and 10 are one or two stars. Everything on this page comes from the Amazon listing — we have not tested this cool box ourselves.
How those 131 ratings break down
An average hides its own shape. This is the spread behind the 4.3 stars.
Specification
Exactly as published on the Amazon listing, field for field.
| Price | £61.90 |
|---|---|
| Customer rating | 4.3 out of 5 from 131 reviews |
| Claimed capacity | 33 litres (as listed) |
| Stated dimensions | 43D x 33W x 46H centimetres |
| External volume of those dimensions | About 65 litres (calculated from the listed dimensions) |
| Power | 12V DC and 240V AC; UK plug and car lead included |
| Cooling and heating | cools to 15°C below ambient, heats to up to 65°C |
| Warranty | 30 days (as listed) |
What buyers actually say
Quoted from customer reviews on Amazon
Verified purchase“This functions as a really useful fridge for camping. It kept things as cool as a real fridge, even in a hot tent in a heatwave. Tall enough for most bottles, and a good size - more capacious than the typical 24L offering of others, but not so big as to completely take up all the boot space in your car. It's incredibly quiet too, even on the standard setting we slept no problem, and on the quiet setting it's practically silent. Yes, you'll collect a pool of condensation at the bottom, but that can't be avoided with this cooling technology, and is easily mitigated with a couple of sheets of kitchen roll/tea towel in the base to absorb.”
Verified purchase“Used once so far for 6 day camping trip so cannot comment on longevity. Replaced a smaller cooler that was 20 years old. It's never going to cool like a proper fridge but cooled enough with ambient temperatures in the high 30's. Hinged lid helps when opening and internal divider helps to keep things together. Will take upright 2l bottle if kept to one side. Foam cloths on the bottom soaks up condensation drips.Overall good value for money.”
What it is up against
The rivals it was ranked against in Best Electric Cool Box 2026: 10 Ranked, and Why the Litre Count Misleads.
Questions people ask
How much does the Crystals 33L cool box actually hold?
The listing claims 33 litres of capacity and says the box takes 1.5L bottles upright. The same listing gives external dimensions of 43 x 33 x 46 centimetres, which multiply out to roughly 65 litres, so a large part of that volume is the box itself rather than storage space.
Does it run in a car and at home?
Yes. Crystals supplies a UK mains plug and a 12V car lead as included components, so the same unit works from a 240V socket indoors and from a vehicle, caravan or boat socket.
How cold does the Crystals 33L get?
The listing says it cools to 15°C below the ambient temperature, not to a set figure. It is a thermoelectric cooler, so how cold the contents get depends on how hot the room or car is.
Can it keep food warm as well?
Yes. The same unit is described as heating to up to 65°C, with a listed heating power draw of 45W to 50W. Cooling power is listed as 48W to 55W.
What warranty comes with it?
The specification lists a product warranty of 30 days. That is the figure printed in the listing, and it is short enough to be worth checking before you order.
How is it rated by buyers?
The listing shows 4.3 out of 5 from 131 ratings, with 67 of those ratings at five stars and 10 at one or two stars.
Comments
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