If you have ever searched for temperature-controlled storage for food, pharmaceuticals, chemicals, or any other perishable product, you have almost certainly come across the term reefer container. But what exactly is a reefer container, how does it work, and why are businesses across the UK increasingly choosing refrigerated containers over traditional cold rooms?
This guide answers all of those questions. Whether you are considering refrigerated container hire, exploring a refrigerated container for sale, or simply trying to understand your cold storage options, Conrail has the expertise and the equipment to help.
What Is a Reefer Container?
A reefer container – short for refrigerated container – is a temperature-controlled intermodal shipping container fitted with an integrated refrigeration unit. The term originates from the shipping industry, where reefer containers have been used for decades to transport perishable goods by sea, rail, and road across the globe.
In the UK, the term is now widely used to describe any self-contained, temperature-controlled container unit used for storage or transport, whether or not it is ever loaded onto a ship. Reefer containers are available in standard 20-foot and 40-foot lengths, and can maintain internal temperatures across an exceptionally wide range – from -40°C at the coldest end to +45°C at the warmest.
At Conrail, we supply refrigerated containers – also known as reefer containers or reefers – for hire and for sale across the UK, serving businesses in food production, food distribution, pharmaceutical manufacturing, retail, and many other sectors.
How Does a Reefer Container Work?
A reefer container operates on the same fundamental principle as a domestic refrigerator or commercial cold room, but scaled up and engineered for the rigours of industrial use. Here is a straightforward breakdown of how the system works:
The Refrigeration Unit
Every reefer container has an integrated refrigeration unit mounted at one end of the container, known as the nose end. This unit contains a compressor, condenser, and evaporator that work together to extract heat from the interior and expel it to the outside. The result is a consistently cold internal environment, regardless of the external ambient temperature.
Insulated Walls, Floor and Ceiling
The body of the container is heavily insulated with polyurethane foam panels built into the walls, floor, and ceiling. This insulation minimises heat ingress from the outside, reducing the energy required by the refrigeration unit to maintain the target temperature and ensuring greater stability in the internal climate.
Air Circulation
Reefer containers use a forced-air circulation system to distribute cold air evenly throughout the interior. Air is drawn in at the top of the container, circulated across the cargo or stored goods, and returned to the refrigeration unit for re-cooling. This prevents hot spots and ensures a uniform temperature across the entire load.
Power Supply
When deployed as static storage units, reefer containers connect to a standard mains power supply – typically 240V single-phase or 415V three-phase depending on the unit and application. Conrail’s engineers will advise on the exact power requirements for each container during the site survey process.
| Conrail Technical Spec
Conrail’s refrigerated containers maintain temperatures from -40°C to +45°C, with humidity-controlled variants offering adjustable humidity and temperature accuracy of ±0.5°C. All containers feature energy-saving LED lighting, escape hatches, sliding strip curtains, and high-insulation panels as standard. |
Reefer Container Key Specifications
The table below summarises the key technical specifications for Conrail’s refrigerated containers:
| Available sizes | 20-foot and 40-foot standard units; modular multi-unit systems also available |
| Temperature range | -40°C to +45°C |
| Temperature accuracy | ±0.5°C (humidity-controlled variants) |
| Power supply | 240V / 415V three-phase (site-dependent) |
| Lighting | Energy-saving 220V LED |
| Door type | Easy-open / easy-lock with sliding strip curtain |
| Safety features | Escape hatch and alarm as standard |
| Insulation | High-value polyurethane foam; low leakage design |
| Hire or purchase | Both options available from Conrail |
| Compliance | Meets UK industry standards and regulations |
What Are Reefer Containers Used For?
Reefer containers are extraordinarily versatile. While they are perhaps best known for their role in food storage and distribution, their applications span a wide range of industries. Here are the most common uses of refrigerated containers in the UK:
Food Storage and Distribution
This is the most widespread application of reefer containers in the UK. Supermarkets, food wholesalers, fresh produce distributors, meat processors, dairy businesses, and catering suppliers all use refrigerated containers to manage seasonal overflow, bridge the gap during cold room refits, and provide flexible capacity at distribution depots. The ability to maintain precise temperatures across the full range of food storage requirements – from +2°C for dairy to -25°C for ice cream – makes reefer containers an essential tool in the food cold chain.
Pharmaceutical and Life Sciences
Many pharmaceutical products, vaccines, biological samples, and research materials require strict temperature control throughout storage and transportation. Reefer containers – particularly Conrail’s deep freeze containers capable of maintaining -40°C – are widely used by pharmaceutical manufacturers, research institutions, and healthcare organisations to provide compliant, auditable cold storage.
Chemical and Industrial Applications
Certain chemicals and industrial materials require temperature-controlled storage to remain stable and safe. Conrail also supplies explosion-proof containers for hazardous goods, providing temperature-controlled storage that meets the additional safety requirements of the chemical and petrochemical sectors.
Agriculture and Horticulture
Seed storage at precisely controlled temperature and humidity is a key application for Conrail’s humidity-controlled containers. Fresh cut flowers, fruit and vegetables, and other horticultural products also benefit from reefer container storage during transportation and at distribution points.
Events and Hospitality
Major outdoor events, festivals, and temporary catering operations require on-site cold storage that can be deployed quickly and removed cleanly. Reefer containers provide exactly this capability, arriving ready to operate and leaving without a trace when the event concludes.
Refrigerated Container Hire or Refrigerated Container for Sale?
One of the first decisions any business faces when considering a reefer container is whether to hire or buy. Both options are available from Conrail, and the right choice depends on your specific operational requirements.
When to Choose Refrigerated Container Hire
- You have a seasonal, short-term, or project-specific cold storage requirement
- You need a rapid solution – refrigerated container hire can be in place within 24-72 hours
- You prefer to avoid capital expenditure and keep costs as operational expenses
- You want Conrail to retain responsibility for maintenance and compliance
- You are bridging a temporary gap while permanent cold storage is installed or refurbished
When to Choose a Refrigerated Container for Sale
- You have a permanent or long-term cold storage requirement
- You want to own the asset and build it into your infrastructure
- You are building a new distribution facility or depot
- Purchasing is more cost-effective than ongoing hire over your required timeframe
| Not sure which is right for you?
The Conrail team will assess your requirements and recommend the most cost-effective solution – whether that is refrigerated container hire, a refrigerated container for sale, or a bespoke modular system. Contact us on 01252 715406 or at info@conrail.co.uk for a free consultation. |
Why Choose Conrail for Refrigerated Containers in the UK?
Conrail has been supplying climate-controlled containers to UK businesses since 2009. Our refrigerated containers are manufactured at our facility in Germany to exacting quality standards, and our team of engineers is available 24/7 to provide on-site and remote support – because cold chain failures do not respect office hours.
Here is what sets Conrail apart as a supplier of food containers and reefer containers in the UK:
- Over 15 years of experience across food, pharmaceutical, chemical, and retail sectors
- Containers manufactured in Germany to the highest quality and compliance standards
- Full range of temperature-controlled solutions: refrigerated, deep freeze, heated containers, humidity-controlled, and explosion-proof
- Both refrigerated container hire and refrigerated containers for sale available
- Bespoke modular container systems for larger or more complex requirements
- 24/7 engineer support to minimise downtime risk
- Cost-effective alternative to built-in cold rooms, with full scalability
- UK-wide delivery and installation
Frequently Asked Questions About Reefer Containers
What is the difference between a reefer container and a cold room?
A reefer container is a self-contained, portable, temperature-controlled unit that can be deployed anywhere with a power supply. A cold room is a fixed, built-in structure. Reefer containers offer greater flexibility and faster deployment, while cold rooms may be more appropriate for very large, permanent storage requirements.
What temperatures can a reefer container maintain?
Conrail’s refrigerated containers can maintain temperatures from -40°C to +45°C, covering all standard food, pharmaceutical, and industrial storage requirements.
Are reefer containers suitable for food storage in the UK?
Yes. Conrail’s refrigerated containers are manufactured to meet UK industry standards and are suitable for food-grade applications when operated in accordance with HACCP principles and relevant food safety legislation.
How quickly can a refrigerated container be delivered?
In most cases, Conrail can deliver and commission a refrigerated container within 24-72 hours of order, depending on location and availability. Call 01252 715406 for urgent requirements.
Can I hire a reefer container for a short period?
Yes. Conrail offers flexible refrigerated container hire terms to suit short-term, seasonal, and long-term requirements. Contact us to discuss your specific needs.
Get a Quote for a Reefer Container from Conrail
Whether you need a refrigerated container for hire or for sale, Conrail is the UK’s trusted supplier of climate-controlled containers for food, pharmaceutical, industrial, and retail applications.
✆ 01252 715406 | ✉ info@conrail.co.uk
Wey Court West, Union Rd, Farnham, GU9 7PT | Mon–Sat 9am–5pm