Most refrigerated containers stop at -25 °C. That covers frozen food, ice cream and the vast majority of cold-chain work — but a handful of products need to go much colder. A super-freezer container reaches -60 to -70 °C, deep into territory a standard reefer simply cannot touch. These units are rare, cost more than a standard machine, and are usually arranged on request rather than pulled off a yard. This guide explains what the super-freezer band is for, who needs it, and how it differs from an ordinary -18 to -25 °C reefer. All UK figures below are ex VAT, with VAT charged at 20%.
What a super-freezer container is
A standard reefer operates across a wide band — roughly -25 °C to +25 °C — and one machine covers frozen, chilled and above-freezing duty from a single setting. A super-freezer is a specialist variant of that same refrigeration unit, built to pull down to -60 or even -70 °C. Everything else is familiar: the same insulated steel box, the same three-phase supply, the same maker names — Carrier, Thermo King, Daikin, Star Cool — behind the front wall. What changes is the depth of cold, and with it the price and the lead time.
Why -18 °C isn’t always cold enough
At -18 °C, water is frozen and most spoilage stops — enough for the food most people store. But some biological processes carry on well below that point. Fatty fish flesh keeps oxidising and discolouring; certain cells and biological materials lose viability; a few pharmaceutical products are only stable far colder than a domestic freezer. For these, -18 or even -25 °C is not a safe hold — the product degrades slowly at temperatures an ordinary freezer treats as “frozen”. Going to -60 °C effectively arrests that residual activity.
Who needs -60 to -70 °C
The list of genuine super-freezer users is short, which is exactly why the equipment is uncommon:
| Sector | Why -60 to -70 °C |
|---|---|
| Sushi-grade tuna | Bluefin and other fatty tuna are held ultra-cold so the flesh keeps its colour for the sashimi market |
| Pharmaceuticals | A minority of vaccines and biologics are only stable at ultra-low temperature |
| Research & clinical samples | Tissue, plasma and other biological samples stay viable when held far below a standard freezer |
| Specialist seafood & food | High-value catches and ingredients where ordinary freezing is not enough |
If your product is everyday frozen stock — meat, ready meals, ice cream — you do not need a super-freezer, and a standard -18 °C reefer will cost far less to hire and to run.
Super-freezer vs standard reefer
| Standard reefer | Super-freezer | |
|---|---|---|
| Coldest set point | about -25 °C | -60 to -70 °C |
| Typical use | frozen, chilled, above-freezing | ultra-low-temperature niche |
| Availability | widely available | rare, usually on request |
| Price | see UK ranges below | higher than standard |
| Running electricity | higher at colder set points | higher again than a -18 °C unit |
The colder you run any reefer, the more electricity it draws: a 20ft unit uses around 85–95 kWh a day chilled at +2 °C and 95–110 kWh a day frozen at -18 °C. A super-freezer holding -60 °C works harder still, so budget for more power than a standard frozen unit — the exact figure depends on the machine, the size and the ambient conditions.
Cost and availability in the UK
There is no shelf price for a super-freezer the way there is for an everyday reefer. As a reference point, standard used reefers are observed at £4,500–7,500 ex VAT and new one-trip units at £18,995–22,500 ex VAT in the UK; a super-freezer sits above the standard machine because the ultra-low-temperature plant is specialist and built in smaller numbers. On the hire side, standard long-term rates start at around £12 a day ex VAT with 90-day minimum terms common, though some suppliers offer shorter terms — a super-freezer again carries a premium and is arranged to order rather than kept on hand. Because these units are specified rather than stocked, the practical route is to describe exactly what you need and let suppliers quote against it.
Power, siting and the rules
A full-size super-freezer needs the same infrastructure as any large reefer: a three-phase 380/400 V supply through a 32 A CEE plug, drawing several kilowatts while it runs — a standard reefer pulls 5 to 12 kW depending on size, and a super-freezer more. Site it where that supply and the airflow around the condenser are both available. On the regulatory side, requirements differ by product and by country: ATP certification covers refrigerated transport, not a container standing still as a store, and sector rules — GDP for pharmaceuticals, HACCP for food — vary by authority, so confirm what applies with the relevant body before you commit.
Getting the right unit
Super-freezer capacity is a specify-on-request item, so the details matter: the temperature you need, the size, and how long for. Browse our other reefer guides or current prices, see what used and new units look like at standard temperatures, and when you’re ready, tell us what you need — we pass your enquiry to specialist suppliers, who contact you directly if they can meet your need.
Frequently asked questions
What is a super-freezer container?
A super-freezer container is a specialist refrigerated container built to reach -60 to -70 °C, far below the -25 °C floor of a standard reefer. It uses the same insulated steel box and three-phase supply, but with a deep-freeze refrigeration unit. These units are rare and cost more than a standard machine, so they are usually arranged on request rather than kept in stock.
How is a super-freezer different from a standard freezer container?
A standard reefer freezes down to about -25 °C, which suits meat, ice cream and everyday frozen stock. A super-freezer reaches -60 to -70 °C for products that keep degrading at ordinary freezer temperatures — sushi-grade tuna, some pharmaceuticals and biological samples. The colder set point also draws more electricity, so a super-freezer costs more to run as well as to hire or buy.
Who actually needs -60 to -70 °C?
Only a short list of products genuinely needs it: sushi-grade bluefin tuna, held ultra-cold so the flesh keeps its colour; a minority of vaccines and biologics; and research or clinical samples such as tissue and plasma. Ordinary frozen goods — meat, ready meals, ice cream — do not, and a standard -18 °C reefer will cost far less to run.
How much does a super-freezer container cost in the UK?
There is no shelf price for a super-freezer, because they are specified rather than stocked. As a reference, standard used reefers are observed at £4,500–7,500 ex VAT and new one-trip units at £18,995–22,500 ex VAT in the UK; a super-freezer sits above that. Hire likewise carries a premium over standard long-term rates that start around £12 a day ex VAT. VAT is charged at 20%.