Laboratory ice makers: how can ice be made readily available close to the workstation?

In the lab, an ice maker provides a steady supply of clean, readily available ice, without relying on domestic trays or overfilled freezers. Essential for 0–4 °C ice baths, holding samples, the quench of exothermic reactions or protecting enzymes, it reduces variability and keeps protocols safe. Two main families: ice cube machines (full or hollow) for longer hold, and granular ice machines (nugget) that pack snugly around tubes. Key criteria: output (kg/24 h), storage bin volume, air- or water-cooled, feed-water quality and hygiene (filters, self-cleaning cycles), stainless-steel build and a low-GWP refrigerant (e.g. R290).

What are the different types of laboratory ice makers?

Two main technologies cover most laboratory needs. Ice cube machines freeze water onto an evaporator to form solid or hollow cubes, then release them by hot-gas cycle reversal or a warm-water flush. They deliver dense, slow-melting ice - ideal for long cooling baths. Granular (nugget) ice machines create pellets by forming flakes on an evaporator drum and compacting them with an auger. This malleable ice wraps around tubes and maximises heat transfer, making it great for fast, responsive handling.

How to choose: size the output (kg/24 h) to your activity peak; check storage capacity; the air-/water-cooled condenser (air: saves water; water: quieter in hot rooms); the drain (gravity or pump-out); water quality (filtration, mineral content/hardness); self-cleaning functions; materials (304/316 stainless steel); a low-GWP refrigerant (e.g. R290); and the footprint (under-bench or freestanding).

For hygiene, look for antimicrobial surfaces, disinfection cycles, washable removable parts and water filtration. The climate class, noise level and service access (front panels) also matter for a durable fit in the lab.

In which fields is a laboratory ice maker used?

• Life sciences: maintaining enzymes, buffers and lysates at 0–4 °C; stabilising DNA/RNA; one-off transport of sensitive samples.
• Pharma/biotech: securing the cold chain during preparations or QC testing; holding at temperature between critical steps.
• Chemistry/materials: quench of exothermic reactions, controlled crystallisations, preparing chilled baths for volatile solvents.
• Food & cosmetics: rapid sample cooling, short-term storage before microbiological analyses, hygienic compliance (HACCP).
• Environment: keeping field samples cold (cool boxes), delivery to the laboratory without breaking the cold chain.
• Diagnostics/clinical & education: bringing reagents to working temperature, teaching lab benches, immediate ice availability during peak workload.

The different types of ice makers available

Frequently asked questions about laboratory ice makers

What is the difference between ice cubes and granular ice?
Ice cubes melt slowly and keep an ice bath stable over time; granular ice packs tightly around tubes for fast, even cooling.

How to size the capacity (kg/24 h)?
Add up peak-demand needs, add a 20–30 % margin, and check that the storage bin bridges the interval between two refills.

Air-cooled or water-cooled?
Air: simple and water-saving, but sensitive to ambient heat; water: quieter and more stable in warm rooms, but uses more water.

Can I use demineralised water?
Most machines require a minimum mineral content/conductivity for level detection. Use filtered drinking water and follow the guidance from the manufacturer.

Which hygiene points should be monitored?
Water filtration, periodic descaling and disinfection, washable removable parts, self-cleaning cycles, and regular purging of the storage bin.

Gravity drain or drain pump?
If the waste line is higher than the outlet, a pump is necessary. Otherwise a gravity drain is sufficient, provided a continuous fall is ensured.

Which refrigerants should be preferred?
Low-GWP refrigerants (e.g. R290) reduce the carbon footprint. Check CE compliance and the room ventilation requirements.