Commercial Blast Chiller Buying Guide
Blast chilling is one of the few pieces of kitchen equipment that earns its place through food safety law as much as through convenience. If cooked food isn't brought down from 70°C to 3°C within 90 minutes, it sits in the temperature danger zone for too long and becomes a genuine risk. A blast chiller does that job reliably, every time, without relying on a walk-in fridge that was never designed for rapid cooling.
This guide covers how blast chilling works, how to size capacity correctly and whether you need blast freezing as well as chilling. It also explains the difference between cabinet, modular and roll-in configurations, and where Foster’s KORE and BCT/BFT ranges fit different kitchens.
How blast chilling actually works
A blast chiller uses high-powered refrigeration and forced air circulation to pull heat out of food far faster than a standard fridge can. Standard refrigeration is built to hold food at a steady temperature. A blast chiller is built to remove heat quickly, which is a different engineering problem entirely, so the two aren't interchangeable.
Most commercial ranges, including Foster's, are built around two core cycles:
- Blast chilling: bringing food from +70°C down to +3°C, typically within 90 minutes, with the option of a soft chill setting for delicate items such as gateaux or mousse that a hard chill could damage.
- Blast freezing: taking food from +70°C down to -18°C, typically within 240 minutes, for longer-term storage without the ice crystal damage that slow freezing causes.
Getting the chill cycle right protects both food safety compliance and product quality. Under-specifying a blast chiller for the volume you actually cook is the single most common buying mistake.
Sizing capacity correctly
Blast chiller capacity is measured in kilograms of food per cycle, and this is where most buying decisions go wrong. A unit sized for today's covers with no headroom for a busy Friday, a banqueting order or seasonal peaks will bottleneck food prep rather than support it.
As a starting point:
- Small kitchens, cafés, and low-volume prep typically suit 10–20kg cycle capacities.
- Mid-size independent restaurants and gastro pubs typically suit 20–40kg cycle capacities.
- Production kitchens, central kitchens, and high-volume catering need trolley-load or modular capacity, often 75kg upwards.
In Foster’s range, the KORE KB5 and KB6 cover the first band at 10kg and 20kg. The KORE KB10 at 35kg and the larger BCT cabinets cover the second. Modular blast chillers take over from 75kg.
It’s worth sizing slightly above current need rather than at the exact ceiling. Blast chillers are a long-term capital purchase, and covers tend to grow, not shrink.
Do you need to blast freeze as well as chill?
This question narrows the choice faster than any other. Plenty of kitchens cook, chill and serve within a few days and never need to freeze. Others batch-cook weeks ahead and freeze as a matter of routine. A chill-only machine suits the first group, because freezing capacity that never gets used adds cost without adding value.
For kitchens that do freeze, how often decides the machine. A blast chiller with occasional freeze capacity suits a site that freezes now and then. A dedicated blast freezer suits a site that freezes every day. Foster covers all three needs. KORE blast chillers chill only. BCT models add occasional freezing, and BFT models are dedicated blast freezers that can also chill.
Cabinet, modular, or roll-in: which configuration fits your kitchen
Cabinet blast chillers are self-contained, freestanding units that fit into a standard kitchen line the same way an upright fridge does. They suit most independent kitchens and are the natural starting point for anyone moving from no blast chiller to their first one.
Modular blast chillers and freezers are built for high-volume kitchens that already work with trolleys rather than shelves. They're designed to take a full trolley load in one cycle, which suits production kitchens, hospital and care catering, and central prep sites supplying multiple outlets.
Roll-in blast chillers sit between the two, accepting a specific trolley type directly into the cabinet. Foster's RBCT20-60, for example, is built specifically to take a Rational GN201 combi oven trolley, so food can go from the combi straight into the blast chiller on the same trolley with no manual transfer. That's a genuine time and labour saving for kitchens already running Rational combi ovens.
There's also a fourth category worth knowing about: controlled thaw cabinets, which safely bring frozen food back up to +1/+4°C over several hours, useful for kitchens that batch-produce and freeze ahead of service.
The Foster range: KORE and the BCT/BFT range
Foster offers two distinct blast chiller ranges, built for different budgets and workloads.
KORE blast chillers
KORE by Foster Gamko replaces Foster’s Xtra blast chillers. It sits below the BCT/BFT range on price and specification. There are three models. The KB5 chills 10kg across 5 levels, the KB6 chills 20kg across 6 levels and the KB10 chills 35kg across 10 levels. All three use 75mm shelf spacing to make full use of the space inside.
Every KORE blast chiller is operated from an intuitive touchscreen with an IP65 water protection rating, built for the wet, busy conditions of a working kitchen. Easy-to-use programmes take the guesswork out of each chill cycle. That matters on sites where different staff run the machine across the week and there’s little time for training.
KORE runs on R290 refrigerant, carries a Climate Class 5 rating for higher ambient temperatures and uses integral refrigeration on a 230V single-phase supply. Stainless steel inside and out comes as standard. KORE blast chillers chill only, so they suit food that is cooled for chilled storage rather than frozen. Each unit is backed by a two-year parts and labour warranty, with 98% of spare parts held in stock.
KORE suits independent restaurants, gastro pubs, cafés and smaller education and care kitchens chilling steady daily batches.
| Model | Chilling capacity | Levels | Height (mm) | Width (mm) | Depth (mm) |
|---|---|---|---|---|---|
| KORE KB5 | 10kg | 5 | 880 | 755 | 720 |
| KORE KB6 | 20kg | 6 | 880 | 755 | 720 |
| KORE KB10 | 35kg | 10 | 1540 | 755 | 720 |
The BCT/BFT range
Foster's BCT/BFT range is the cabinet, modular and roll-in range built for demanding, high-volume use, and it carries Foster's own history in this category, in continuous production since 1973. Every cabinet model uses an intuitive touchpad control panel, with colour-coded cycle status and automatically selected timed or probe chill/freeze options.
BCT (Blast Chiller Touchpad) models carry an occasional freeze capacity as standard, shown in the product code suffix. A BCT38-18, for example, gives 38kg blast chilling capacity with 18kg of occasional blast freezing on top. Because there's no integrated defrost system for freezing, this suits kitchens that mostly blast chill but occasionally need to freeze, rather than kitchens freezing daily.
BFT (Blast Freezer Touchpad) models are dedicated blast freezers built for regular, high-frequency freezing, and can also operate as a blast chiller when needed, giving more flexibility in the other direction.
Modular blast chillers and freezers scale from 75kg to 250kg per cycle and are designed to take most standard trolleys, with occasional freezing available on MBCFT models, for kitchens producing at real volume.
RBCT20-60 is the dedicated roll-in model built for Rational GN201 trolleys, with a 60kg chilling capacity.
CT75 controlled thaw cabinets safely thaw up to 75kg of food from frozen to +1/+4°C, typically over 7 to 10 hours.
All BCT/BFT cabinet models are built with 304 stainless steel interior and exterior, with automatic temperature hold once a cycle completes, so kitchen staff don't need to babysit the process.
Why this matters for HACCP and food safety compliance
UK food safety regulations require cooked food destined for chilled storage to pass through the danger zone quickly, and a blast chiller is the standard, auditable way to demonstrate that. Foster's BCT/BFT range supports this further with an RS485 connection option for HACCP data logging, giving kitchens a recorded, verifiable chill history rather than relying on a manual temperature log. For any site handling environmental health inspections, whether that's a restaurant, a care setting, or a public sector kitchen, this kind of documented compliance is increasingly expected rather than optional.
Choosing between KORE and the BCT/BFT range
Volume and freezing usually decide the range, ahead of budget. KORE fits kitchens chilling up to 35kg per cycle that don’t need to freeze and want simple touchscreen operation.
The BCT/BFT range is the step up for any of these needs:
- occasional or dedicated freezing
- cabinet capacities up to 52kg
- trolley-load or modular volume
- HACCP data logging over RS485
- roll-in compatibility with Rational combi trolleys
For the heaviest-use production sites, the BCT/BFT and modular ranges are the recommendation.
Frequently asked questions
What's the difference between a blast chiller and a normal fridge?
A normal fridge is designed to hold food at a steady temperature. A blast chiller is designed to remove heat rapidly from hot food, using far higher refrigeration capacity and forced air circulation, so it can bring food through the temperature danger zone quickly and safely.
How fast does a blast chiller need to cool food?
The recognised UK benchmark is bringing cooked food from +70°C to +3°C within 90 minutes for blast chilling, or down to -18°C within 240 minutes for blast freezing.
Can one machine blast chill and blast freeze?
Yes, though not every blast chiller does both. Foster’s KORE blast chillers chill only. BCT models add occasional freeze capacity for infrequent freezing, and dedicated BFT blast freezers can also run as blast chillers. The right choice depends on which function you’ll use most.
What size blast chiller do I need?
It depends on how many kilograms you chill per cycle, not just cover numbers. As a guide, small kitchens typically need 10 to 20kg, mid-size kitchens 20 to 40kg, and high-volume or production kitchens 75kg or more, often in modular or trolley-based formats. In Foster’s range, the KORE KB5 and KB6 handle 10kg and 20kg and the KB10 handles 35kg. The BCT/BFT and modular ranges cover larger volumes.
If you’re not sure which model fits your kitchen’s volume, our team can help you size the right unit before you buy.