What can a combi-steamer do?

Combi-steamers can generate both dry heat (like a convection oven) and moist heat (like a steamer) either simultaneously or in alternation as needed. This makes these cooking systems ideal for cooking potatoes and other vegetables quickly yet gently, baking rolls or cakes, or roasting or braising meat. Their versatility gives restaurateurs the flexibility to prepare a wide variety of food more economically and with better results. Convection or fan-assisted ovens are considered a predecessor to the combi-oven, but they lack the steam cooking feature.

The ability to combine hot air and a continuous supply of freshly generated steam inside the cooking cabinet enables a wide variety of cooking techniques in a single cooking system, including steaming, baking, grilling, roasting, deep-frying, and many more. Chefs can combine all manner of cooking methods in the same versatile appliance.

Controlling moisture levels is one of the reasons chefs began wrapping food in paper, aluminum foil, or vegetables. The desire to prevent hot air from drying out food inspired the development of preparation methods like en papilotte and sous vide, both of which are now common in professional kitchens. The most widely used such technique is basting food periodically while roasting it.

Air heats up much more quickly than water, but it doesn't retain heat as long. Although it reacts quickly, air is a poor conductor of heat. Some time ago, food technology researchers discovered that heat transfers to food much more quickly when steam condenses on the food's surface (which is cooler than the surrounding air). In other words, moist, humid air quickly balances out hot and cold spots during the cooking process.

The combi-steamer makes the most of this knowledge: it heats moist air and then transfers the energy from the steam to the food with maximum efficiency. The moisture acting on the product settles (partly) on the food, transferring a great deal of heat and thus a great deal of energy into the food quickly (known as phase alternation). The first RATIONAL combi-steamer was developed in 1976 on the basis of this very principle.

Use of both systems – steam generator and heating element. This makes it possible to adjust humidity settings to the exact percentage. The climate control system regulates humidification and dehumidification precisely.

Benefit:

  • Roasts, poultry, and seafood are juicier than ever.
  • Cooking losses reduced by as much as 50% (vs. predecessor model).
  • No flavor transfer on mixed loads.
  • Precisely adjusted humidity levels and temperature settings right down to the exact degree ensure the best possible results.
  • Save massive amounts of time compared to conventional methods.

Preparation methods:

  • Steaming
  • Baking
  • Grilling
  • Roasting
  • Pan-frying and many others
  • Investment peace of mind.
  • User friendliness (simple, intuitive, networked).
  • Automated hygiene standards.
  • More reliable kitchen processes.
  • The best possible food quality.
  • Time savings thanks to 24-hour use.

Intelligent combi-steamers make it easy to avoid stressful kitchen situations. Just use the factory-installed cooking process presets, and the cooking system will detect the load quantity and adjust the process intelligently to fit the product. RATIONAL pioneered this concept back in 2004 and has been developing and improving its intelligent processes continuously ever since.

Step 1

  • Tap an icon to preselect either a food group (poultry, seafood, meat, side dishes, egg dishes, baked goods) or a cooking appliance (pan, pot, grill, oven). The Finishing® process is another available option.

Step 2

  • Select the exact preparation method using cooking paths like “pan-fry poultry" (e.g., for chicken cordon bleu) or “side dishes” (e.g., for rice).
    Optional: Adjust parameters, such as browning level, time, or core temperature, to fit individual preferences.

Step 3

  • Start the cooking process. The cooking system will then notify the user whenever action needs to be taken or once the food is ready to unload.
Image of a Rational iCombi Pro oven with various dishes inside and a plated dish of sliced meat and vegetables.

Discover the benefits of the iCombi Pro today.

Mechanism of action
Combi-steamer/iCombi Pro Combines steam and hot air
Convection oven Only uses hot air
Use of steam
Combi-steamer/iCombi Pro
Convection oven
Use of hot air
Combi-steamer/iCombi Pro
Convection oven
Combination of steam and hot air
Combi-steamer/iCombi Pro
Convection oven
Precise temperature and humidity control
Combi-steamer/iCombi Pro High
Convection oven Limited
Suitability for delicate foods (e.g., seafood, desserts)
Combi-steamer/iCombi Pro Highly suitable
Convection oven Less suitable
Suitability for bread and pastries
Combi-steamer/iCombi Pro Optimal thanks to steam feature
Convection oven Limited by lack of steam
Regeneration of food
Combi-steamer/iCombi Pro Gentle and efficient
Convection oven Limited; may dry out food
Energy efficiency
Combi-steamer/iCombi Pro High
Convection oven Medium
Ease of cleaning
Combi-steamer/iCombi Pro Automatic cleaning
Convection oven Requires manual cleaning
Procurement cost
Combi-steamer/iCombi Pro Higher than convection oven
Convection oven Lower than combi-steamer
Flexibility
Combi-steamer/iCombi Pro Highly flexible, suitable for a variety of dishes
Convection oven Limited
Suitability for large quantities of food
Combi-steamer/iCombi Pro
Convection oven
Practical uses in small kitchens
Combi-steamer/iCombi Pro
Convection oven
Advanced applications (e.g., sous-vide, smoking)
Combi-steamer/iCombi Pro ✔ (suitable)
Convection oven ✖ (not suitable)
Glass doors (so user can see cooking process)
Combi-steamer/iCombi Pro
Convection oven Sometimes

Conventional convection ovens only work with dry hot air, while steamers only deliver moist heat. The combi-steamer goes one key step further by combining the two technologies – and thus replacing conventional cooking systems entirely. Its ability to coordinate heat and steam precisely allows it to adapt to any food and any culinary need – while delivering uniformly high-quality results. As such, there are no applications for which convection ovens are more suitable than combi-steamers.

A combi-steamer is a professional oven that combines hot air and steam in variable proportions to cook food gently, evenly, and efficiently. Modern models like the RATIONAL iCombi Pro allow precise temperature, humidity, and cooking time regulation, so users can get consistently excellent results on a wide variety of dishes.

Thanks to their flexibility in cooking method applications, combi-steamers can cook almost any food perfectly, from meat and seafood to vegetables and baked goods. A single cooking system can handle steaming, convection cooking, grilling, roasting, and even baking.

Combi-steamers let users combine multiple cooking methods: Steaming to preserve nutrients, convection for crisp browning, grilling functions for appetizing grill marks, and gentle regeneration of previously prepared food. Juicy roasts, tender fish filets, crunchy vegetables, fluffy cakes – the possibilities are nearly endless.

Combi-steamers combines steam and hot air within an insulated cooking cabinet. In the RATIONAL iCombi Pro, sensors continuously measure temperature, humidity, and cooking progress. This intelligent regulation creates optimal conditions for each dish in order to ensure uniformly excellent results.

Combi-steamers are generally available as both electric and gas-powered models. The ideal choice depends on the individual kitchen's needs. The RATIONAL iCombi Pro is available with either electrical or gas connections.

Conventional ovens mainly work with dry heat, whereas combi-steamers can introduce steam into the cooking cabinet as well. This enables precise regulation of both humidity and temperature. The result: juicier food, shorter cooking times, reduced cooking losses, and more consistent quality. The RATIONAL iCombi Pro makes the most of all of these benefits.

Combi-steamer purchases pay off in the medium term, as they optimize kitchen processes, save energy, and deliver consistently high food quality. The RATIONAL iCombi Pro offers intelligent programs that monitor cooking progress and thus reduce staffing requirements. It also helps optimize the kitchen's cost of goods, which significantly increases profitability.

Combi-steamers like the RATIONAL iCombi Pro simplify work processes, ensure consistent quality, reduce cooking times, save energy, and optimize resource usage. This results in more effective kitchen processes, less strain on staff, and happier customers.

Whether a combi-steamer requires a separate recirculating hood depends on local regulations and spatial conditions. The iCombi Pro has optional exhaust air systems to divert steam and odors properly.

Factors like capacity, energy efficiency, ease of use, maintenance, and customer service should all be considered when choosing a combi-steamer for a restaurant. The iCombi Pro from market leader RATIONAL offers intelligent regulation, exceptional reliability, comprehensive recipe support, and robust customer service – which means genuine added value for every restaurant.

High throughput, robust construction, and efficient processes are essential in commercial production food service. A combi-steamer like the iCombi Pro from market leader RATIONAL offers large production capacities, flexible cooking programs, easy cleaning, and user-friendly controls – perfect for canteens, hospitals, or schools.

The combi-steamer from market leader RATIONAL, the iCombi Pro, has automatic cleaning systems. Based on how much cleaning it requires, it selects one of several fully automatic cleaning programs that use special cleaning agents and rinse aids. This minimizes the manual effort required.

The service life of a combi-steamer depends on how often it is used, cleaned, and maintained. High-quality cooking systems like the RATIONAL iCombi Pro are designed for long-term professional use; with proper handling and regular maintenance, they can continue working reliably for many years to come.

Combi-steamer energy needs vary depending on the model type, size, and features. Power consumption typically ranges from about 6 kW for the smallest model to 20 kW for a table-top unit. The RATIONAL iCombi Pro is available in different sizes and performance levels to fit any kitchen's individual needs.

Convection ovens or fan-assisted ovens primarily work with hot air (convection), whereas combi-steamers also offer a steam function. Combi-steamers combine the benefits of both methods; this combination of humidity and hot air allows greater flexibility, better cooking results, and more efficient kitchen processes – especially in cooking systems like the RATIONAL iCombi Pro.

Chef plating dumplings with team in front of RATIONAL iCombi Pro combi ovens during a cooking workshop.

RATIONAL live events.

Discover our product together.

iCombi Pro

Person using tablet and taking notes with pencil on paper in a study or work setting.

It pays off.

Use the RATIONAL ROI calculator to calculate potential savings compared to conventional cooking technology.