Rational

RATIONAL Commercial Cooking Equipment

RATIONAL is a manufacturer of advanced commercial cooking equipment designed for professional kitchens that need versatility, consistency, and high production capacity. The RATIONAL product line combines multiple cooking methods into intelligent cooking systems that can help restaurants, hotels, catering operations, schools, healthcare facilities, commissaries, banquet kitchens, and other foodservice businesses handle a wide range of menu production.

At Nishi Enterprise, our RATIONAL collection focuses on two of the brand's major commercial cooking platforms: the RATIONAL iCombi Pro combi oven and the RATIONAL iVario Pro multifunctional cooking system.

Our current assortment includes iCombi Pro ovens in half-size and full-size configurations, electric and natural gas models, and capacities ranging from smaller 6-pan units to large 20-pan production ovens. We also carry iVario Pro systems ranging from compact countertop models to large 26 and 40-gallon cooking systems for high-volume kitchens.

What Is RATIONAL?

RATIONAL specializes in commercial cooking systems designed to perform multiple kitchen functions within a single piece of equipment.

Rather than building a cookline entirely around separate ovens, steamers, kettles, braising pans, and other traditional equipment, operators can use RATIONAL systems to consolidate multiple cooking processes where the menu and production requirements make that approach practical.

The result is a product line aimed at kitchens that value flexible cooking capacity, repeatable production, and the ability to prepare many different menu items within the same cooking platform.

RATIONAL iCombi Pro

The RATIONAL iCombi Pro is an intelligent commercial combi oven that combines convection heat and steam within one cooking system.

This allows the oven to handle a broad range of cooking applications, including roasting, baking, steaming, grilling, reheating, and other production methods depending on the food and cooking program.

Instead of dedicating separate pieces of equipment to every cooking method, a commercial kitchen can use the iCombi Pro for many different menu items throughout the day.

Nishi Enterprise carries iCombi Pro models in several capacities, fuel types, and electrical configurations so operators can select a unit that matches their kitchen and production requirements.

What Is a Combi Oven?

A combi oven combines convection cooking and steam within the same commercial oven.

Convection uses circulated hot air, while steam introduces moisture into the cooking environment. A combi oven can use these methods individually or together depending on the cooking process.

This flexibility is what makes commercial combi ovens useful for restaurants with varied menus. The same oven can potentially handle vegetables during one production cycle, roasted proteins during another, and baked products later in the day.

Why Restaurants Choose RATIONAL Combi Ovens

A RATIONAL combi oven can be valuable when a restaurant needs one cooking platform to handle many different products.

The iCombi Pro is designed around intelligent cooking controls that manage cooking processes while allowing the operator to specify the desired result.

For a restaurant, that can help create a more standardized production process across shifts and employees rather than relying entirely on manual adjustments throughout every cook cycle.

The value of a combi oven is especially noticeable in kitchens where flexibility and production volume matter as much as the footprint of the equipment.

RATIONAL iCombi Pro 6-Half

The RATIONAL iCombi Pro 6-Half provides commercial combi cooking in one of the more compact configurations within the lineup.

The RATIONAL iCombi Pro 6-Half Electric Combi Oven accommodates six half-size sheet pans and provides a compact option for kitchens that want RATIONAL combi technology without moving immediately into a larger cabinet.

Nishi also carries natural gas versions of the 6-Half configuration.

RATIONAL iCombi Pro 6-Full

A 6-Full iCombi Pro increases the pan format while retaining a relatively compact oven configuration.

The RATIONAL iCombi Pro 6-Full Natural Gas Combi Oven is designed to accommodate six full-size sheet pans.

This can be useful for restaurants that need greater pan area without requiring a 10 or 20-pan oven.

RATIONAL iCombi Pro 10-Half

The 10-Half iCombi Pro provides additional vertical cooking capacity for kitchens with higher production requirements.

Nishi carries both electric and natural gas configurations, including the RATIONAL iCombi Pro 10-Half Electric Combi Oven.

A 10-pan unit can be a strong middle ground for restaurants that have outgrown smaller combi ovens but do not require the footprint or production volume of a roll-in 20-pan system.

RATIONAL iCombi Pro 10-Full

The RATIONAL iCombi Pro 10-Full combines greater pan capacity with full-size sheet-pan capability.

The RATIONAL iCombi Pro 10-Full Electric Combi Oven accommodates ten full-size sheet pans.

Nishi also carries natural gas versions of the 10-Full for operations planning around gas rather than an all-electric configuration.

RATIONAL iCombi Pro 20-Half

A 20-Half iCombi Pro is designed for substantially larger production requirements.

The RATIONAL iCombi Pro 20-Half Natural Gas Combi Oven accommodates twenty half-size sheet pans.

This type of capacity is better suited to high-volume restaurant groups, hotels, banquet facilities, catering kitchens, institutional foodservice, and other operations producing large quantities within each cooking cycle.

RATIONAL iCombi Pro 20-Full

For the largest production requirements represented in this collection, the RATIONAL iCombi Pro 20-Full provides capacity for twenty full-size sheet pans.

This configuration is intended for operations where combi cooking is a major part of daily production and substantial quantities of food need to move through the oven.

Half-Size vs. Full-Size RATIONAL Combi Ovens

The difference between half and full-size iCombi Pro models is important when planning production.

Half-size models use a smaller sheet-pan format and can be well suited to kitchens that prioritize a smaller equipment footprint.

Full-size models accommodate larger sheet pans and provide greater cooking area per rack position.

The correct choice depends on the pans already used in the kitchen, menu, production volume, available space, and overall kitchen workflow.

6 vs. 10 vs. 20-Pan RATIONAL Combi Ovens

RATIONAL iCombi Pro models are available at very different production scales.

A 6-pan combi oven can work well in smaller restaurants and specialized cooking stations.

A 10-pan combi oven provides greater production while still remaining practical for many full-service restaurant kitchens.

A 20-pan combi oven is intended for significantly higher-volume environments such as banquet operations, commissaries, hotels, schools, and institutional foodservice.

The largest model is not automatically the best model. Equipment should be sized according to realistic peak production requirements.

Electric RATIONAL Combi Ovens

Nishi Enterprise carries multiple electric RATIONAL iCombi Pro ovens.

Available electrical configurations vary by model, including 208/240V and 480V options within parts of the collection.

Electric models can be particularly relevant to kitchens being designed around electric cooking equipment or facilities where gas is not the preferred utility.

Always verify voltage, phase, electrical load, and installation requirements for the exact model before ordering.

Natural Gas RATIONAL Combi Ovens

The collection also includes natural gas RATIONAL iCombi Pro ovens in several capacities.

Gas models allow operators with appropriate utility infrastructure to incorporate a RATIONAL combi oven into a gas-equipped commercial kitchen.

Because gas models still have electrical requirements for controls and other components, review the complete utility specifications rather than looking only at the fuel type.

Electric vs. Gas RATIONAL Combi Oven

The choice between electric and gas depends on the restaurant's existing utilities, kitchen design, equipment plan, electrical capacity, gas service, operating preferences, and local project requirements.

The decision should be made during kitchen planning rather than after the cooking line has already been finalized.

For new construction, the combi oven's utility requirements should be coordinated with the electrical, gas, water, drainage, ventilation, and installation plan for the complete kitchen.

What Can You Cook in a RATIONAL iCombi Pro?

The versatility of the iCombi Pro is one of the main reasons restaurants consider a combi oven.

Depending on the menu and cooking program, commercial kitchens can use combi technology for roasting proteins, steaming vegetables, baking, reheating prepared foods, cooking mixed menu components, finishing products, and many other applications.

This makes a RATIONAL combi oven relevant to far more than one type of restaurant.

RATIONAL for Indian Restaurants

RATIONAL cooking systems can be particularly useful in Indian restaurants and banquet kitchens with broad menus and substantial production requirements.

An iCombi Pro can support production involving roasted proteins, vegetables, rice dishes, baked items, reheating, banquet preparation, and other recipes that fit combi cooking methods.

It does not replace every specialized appliance in an Indian kitchen. Equipment such as a tandoor, stock pot range, fryer, or conventional range may still serve important roles.

Instead, the combi oven can become another highly flexible production tool within the overall kitchen.

RATIONAL for Mediterranean & Middle Eastern Restaurants

Mediterranean and Middle Eastern kitchens can also benefit from the ability to roast, bake, steam, and finish different menu items within one cooking system.

Restaurants producing proteins, vegetables, rice, baked dishes, and large catering orders can use the iCombi Pro as part of a broader cooking line built around their specific menu.

RATIONAL for Hotels & Banquet Kitchens

Hotels and banquet facilities often need to produce many portions within narrow service windows.

Larger iCombi Pro models can provide substantial pan capacity for these environments, while intelligent cooking programs can help standardize production across repeated batches.

For a hotel kitchen, the ability to use the same cooking system for breakfast, banquet production, restaurant service, and other meal periods can make the equipment particularly versatile.

RATIONAL for Catering Operations

Catering kitchens regularly move between different menus and production volumes.

A combi oven gives these operations the ability to use one cooking platform for many recipes rather than dedicating a separate appliance to every cooking method.

High-capacity iCombi models can be especially relevant for wedding, corporate, and banquet caterers producing hundreds of portions at a time.

RATIONAL for Schools & Institutional Foodservice

Schools, healthcare kitchens, corporate dining operations, and institutional foodservice facilities often prioritize repeatable large-batch production.

RATIONAL cooking systems offer multiple capacity options so the equipment can be matched to the number of meals the facility prepares.

Large iCombi and iVario systems can be particularly relevant where one kitchen prepares substantial quantities on a regular schedule.

RATIONAL iVario Pro

The RATIONAL iVario Pro is a multifunctional commercial cooking system built around direct contact heat rather than the oven cavity used by the iCombi Pro.

Depending on the model and application, the iVario Pro can be used for processes such as boiling, pan-frying, braising, and other high-volume cooking tasks.

The system can replace or supplement equipment traditionally handled by tilt skillets, braising pans, kettles, and other bulk cooking appliances depending on the menu.

RATIONAL iCombi Pro vs. iVario Pro

The iCombi Pro and iVario Pro are complementary rather than interchangeable.

The iCombi Pro cooks inside an oven cavity using convection, steam, or combinations of the two.

The iVario Pro uses heated cooking pans and direct contact heat for applications such as boiling, frying, braising, and bulk production.

A kitchen can therefore use the iCombi for oven-based production while using the iVario for foods that would traditionally be prepared in skillets, kettles, pots, or braising pans.

RATIONAL iVario Pro 2-XS

The RATIONAL iVario Pro 2-XS is a compact countertop configuration with two separate cooking pans.

Nishi's current model provides two 4.5-gallon pans for a combined capacity of approximately 9 gallons.

This configuration can be useful when a restaurant wants iVario cooking capability but does not need the capacity of a large floor-mounted system.

RATIONAL iVario Pro 2-S

The iVario Pro 2-S provides greater capacity while retaining a two-pan configuration.

The RATIONAL iVario Pro 2-S P available from Nishi uses two 6.5-gallon cooking pans for approximately 13 gallons of combined capacity.

The pressure-capable version provides another production option for kitchens evaluating multifunctional bulk cooking equipment.

RATIONAL iVario Pro L

The RATIONAL iVario Pro L P is a larger floor-mounted cooking system with approximately 26 gallons of capacity.

This format moves beyond compact restaurant production into heavier batch cooking for high-volume commercial kitchens.

Large restaurants, banquet kitchens, institutional facilities, and commissaries can consider this size when conventional countertop equipment cannot provide enough batch capacity.

RATIONAL iVario Pro XL

The RATIONAL iVario Pro XL provides approximately 40 gallons of cooking capacity and is designed for large-scale production.

Nishi also carries a pressure-capable XL configuration.

This type of system is particularly relevant for operations producing soups, sauces, braised foods, rice, bulk entrées, and other foods in significant quantities.

RATIONAL iVario Pro for Indian Cooking

The iVario Pro can be particularly interesting for Indian restaurants, banquet kitchens, and caterers because these operations frequently prepare large batches of gravies, sauces, curries, rice, vegetables, and other menu components.

A larger iVario system can provide an alternative way to approach some of the production traditionally performed with several large pots, braising pans, or other batch-cooking equipment.

The appropriate setup depends on the actual recipes, batch sizes, and production process of the kitchen.

RATIONAL iVario Pro for Catering & Banquets

Caterers and banquet kitchens often prepare large batches where capacity and repeatability are critical.

The larger iVario L and XL systems can be used as centralized batch-cooking equipment for foods that would otherwise require several separate pots or pans.

Smaller 2-XS and 2-S models provide more flexibility when the kitchen needs to cook two products independently within one system.

Why Combine iCombi Pro & iVario Pro?

The two RATIONAL platforms address different parts of commercial cooking.

The iCombi Pro handles oven-based cooking with hot air and steam, while the iVario Pro focuses on direct-contact cooking in a pan.

A kitchen using both systems can therefore cover a broad range of cooking processes while reducing its dependence on numerous single-purpose appliances.

Whether that approach makes sense depends on menu, production volume, staffing, available hood space, utilities, and overall kitchen design.

RATIONAL for High-Volume Production

RATIONAL offers equipment at several very different production scales.

A small restaurant can consider compact 6-pan iCombi or countertop iVario systems, while a commissary or banquet operation can move toward 20-pan combi ovens and 40-gallon iVario models.

This range allows the equipment to be selected according to actual production rather than forcing every operation into the same size cooking system.

RATIONAL for Small Commercial Kitchens

Advanced cooking equipment is not limited to large institutional kitchens.

Compact iCombi and iVario configurations can also be useful in kitchens where space is limited but menu variety remains high.

When several cooking processes can be handled by one appliance, a restaurant may be able to make more productive use of a smaller cookline.

RATIONAL for Multi-Location Restaurant Groups

Restaurant groups often need to reproduce the same menu across several kitchens.

Cooking systems with programmable and intelligent controls can help operators build more standardized cooking processes from location to location.

Equipment selection should still account for the volume and menu needs of each store rather than assuming every location requires the same capacity.

Choosing the Right RATIONAL iCombi Pro

Start with production capacity.

Determine whether the kitchen needs a 6, 10, or 20-pan oven and whether half-size or full-size sheet pan compatibility is more appropriate.

Next, consider electric versus natural gas and verify the available utility infrastructure.

Then review the exact model's dimensions, pan configuration, voltage, phase, gas requirements, water supply, drainage, ventilation, clearances, and installation requirements.

A combi oven should be planned as part of the complete kitchen rather than selected only according to its pan count.

Choosing the Right RATIONAL iVario Pro

For iVario, consider the types of food being prepared and the typical batch size.

A compact 2-XS may be appropriate when the kitchen values separate smaller cooking zones.

The 2-S increases capacity while preserving a two-pan layout.

The L and XL move toward large-volume batch production for kitchens preparing substantial quantities.

Also compare pressure and non-pressure configurations where available, electrical requirements, physical dimensions, available floor space, and how the system will fit into the overall production workflow.

Planning Utilities for RATIONAL Equipment

RATIONAL cooking systems should be planned carefully before installation.

Depending on the exact model, the project may need to account for electrical service, natural gas, water, drainage, ventilation, and equipment clearances.

Do not assume that two iCombi models with similar capacities have identical utility requirements. Voltage, phase, fuel type, and other specifications can vary substantially between configurations.

RATIONAL Equipment for New Restaurant Projects

For a new restaurant, RATIONAL equipment is best considered during the kitchen design stage.

Choosing an iCombi or iVario early allows the rest of the cookline, utilities, ventilation, prep space, and equipment layout to be planned around the cooking system.

This is particularly important if the operator expects the RATIONAL equipment to replace several pieces of conventional cooking equipment.

RATIONAL Equipment at Nishi Enterprise

Nishi Enterprise carries a growing selection of RATIONAL commercial cooking equipment, including iCombi Pro combi ovens and iVario Pro multifunctional cooking systems in multiple sizes and configurations.

Our live collection currently includes 6, 10, and 20-pan iCombi Pro ovens along with compact and high-capacity iVario Pro models.

Because RATIONAL equipment involves important decisions around capacity, power, gas, water, drainage, and kitchen layout, the correct model should be selected according to the specific project rather than simply choosing the largest available unit.

Shop RATIONAL iCombi Pro & iVario Pro Equipment

Explore our collection of RATIONAL combi ovens, RATIONAL iCombi Pro ovens, RATIONAL iVario Pro cooking systems, commercial combi ovens, tilt skillets, and multifunctional commercial cooking equipment.

Whether you are designing a restaurant, expanding a catering kitchen, upgrading a hotel or banquet operation, or building a high-volume production facility, RATIONAL offers cooking systems across a wide range of capacities.

Contact Nishi Enterprise if you need help comparing iCombi Pro sizes, electric and natural gas configurations, iVario capacities, or the other equipment needed to complete your commercial kitchen.