Combi Steamer vs. Convection Oven - Differences Explained
Combi steamers and convection ovens are often confused but are different devices. The combi steamer is the advanced development of the convection oven with an additional steam function. We explain the differences. All available devices can be found in the category Combi Steamers & Convection Ovens.
What is a Convection Oven?
A convection oven (also called hot air oven or circulating air oven) is a professional cooking appliance that works with circulating hot air. A fan distributes the heated air evenly inside the cooking chamber so that multiple trays can be cooked simultaneously and uniformly. Convection ovens reach temperatures up to 300 °C and are ideal for baking, roasting, frying, and gratinating. They are simpler in construction, cheaper to purchase, and require less maintenance than a combi steamer—but cannot steam.
Typical applications include bakeries, patisseries, pizzerias, snack bars, and large kitchens focusing on baked goods and roasting. Well-known manufacturers include Rational, UNOX, Bartscher, and Saro.
What is a Combi Steamer?
A combi steamer is the advanced development of the convection oven: it combines hot air and steam—separately or together. Thus, it can not only bake and roast but also steam, cook, poach, regenerate, and prepare sous-vide. A combi steamer replaces multiple devices and is now standard in modern professional kitchens.
The Key Differences
Convection Oven
The Hot Air Specialist
- Operates only with hot air (circulating air)
- Temperatures up to 300°C
- Ideal for baking, roasting, frying
- Simpler technology
- Cheaper to purchase
- Less maintenance
Price: from approx. €330 net
Combi Steamer
The All-Rounder
- Hot air AND steam (combining possible)
- Temperatures 30-300°C
- Can steam, bake, roast, cook, regenerate
- More complex technology
- Higher purchase cost
- More maintenance (descaling)
Price: from approx. €2,500 net
Cooking Methods Compared
| Cooking Method | Convection Oven | Combi Steamer |
|---|---|---|
| Baking (bread, cake) | ✓ Yes | ✓ Yes |
| Roasting (meat) | ✓ Yes | ✓ Yes (gentler) |
| Grilling/Gratinating | ✓ Yes | ✓ Yes |
| Steaming (vegetables, fish) | ✗ No | ✓ Yes |
| Sous-vide / Low-temperature cooking | ✗ No | ✓ Yes |
| Regenerating | △ Limited | ✓ Yes (without drying out) |
| Poaching | ✗ No | ✓ Yes |
| Braising | △ Limited | ✓ Yes (optimal) |
When to Use Which Device?
Convection oven is sufficient for:
- Bakeries (rolls, bread, cakes)
- Pizzerias (in addition to the pizza oven)
- Snack bars focused on baking/roasting
- Businesses with tight budgets
- Simple menus
Combi steamer recommended for:
- Restaurants with versatile cuisine
- Hotels (breakfast + restaurant)
- Canteens and large kitchens
- Caterers (food regeneration)
- Health-conscious concepts (steaming)
- Cook & Chill systems
Advantages of the Combi Steamer in Detail
- Less weight loss: Meat loses up to 50% less weight due to steam addition
- Gentler cooking: Vitamins and nutrients are better preserved
- More capacity: Multiple cooking methods possible simultaneously
- Energy efficiency: Due to shorter cooking times and multiple loading
- Better results: Professional quality even with large quantities
- Automatic programs: Modern devices have intelligent cooking control
For even more details, read our guide Combi Steamer: Advantages, Functions & Applications.
Operating Costs
| Cost Factor | Convection Oven | Combi Steamer |
|---|---|---|
| Purchase (net) | from approx. €330 | from approx. €2,500 |
| Electricity consumption | Moderate | Similar to higher |
| Water consumption | Minimal | Higher (steam) |
| Maintenance/year | €100 - 300 | €300 - 800 |
| Descaling | Not necessary | Regularly required |
Which Design for Which Operation?
| Operation | Typical Requirement | Suitable Design |
|---|---|---|
| Snack bar, kiosk, petrol station | Proofing, snacks, gratinating | Hot air oven without humidification |
| Café, bakery branch, hotel breakfast | Baked goods with gloss and volume | Hot air oven with humidification |
| Bistro, restaurant up to approx. 60 meals | Full cooking spectrum on small footprint | Combi steamer 5–6 trays |
| Restaurant, hotel kitchen, catering | Meat, fish, side dishes in parallel | Combi steamer 6–10x GN 1/1 |
| Canteen, large kitchen, banquet | Hundreds of meals per batch | Combi steamer 10–20x GN 1/1 or GN 2/1 |
Humidification is the underestimated middle ground. Those who mainly bake do not need a full-featured combi steamer: a hot air oven with manual humidification and grill function costs about €600 net with us and produces rolls with gloss and crust—a fraction of the cost of a combi steamer.
Size: Reading Trays and GN Racks Correctly
The size specification is embedded in the rack standard, and it is worth a close look because two worlds coexist:
Baking trays: Compact hot air ovens take trays around 430 × 320 mm, larger ones the euro norm 600 × 400 mm from bakeries. Those who want to reuse existing trays should measure before purchase.
Gastronorm (GN): Combi steamers are classified according to GN containers—GN 1/1 measures 530 × 325 mm, GN 2/1 is double that. “6x GN 1/1” means six racks in full Gastronorm width. Smaller kitchens often do better with 5–6x GN 2/3 because the device is plug-ready with 230 V and fits on the work surface. What GN sizes exist and how they divide are listed comprehensively in GN container sizes.
Rule of thumb per rack GN 1/1: about 8–10 meals per cooking cycle. A 6-tray device supplies about 50–60 meals in one batch, a 10-tray over 100.
Connection and Installation
Electricity: Small hot air ovens and compact combi steamers in the GN-2/3 format run on 230 V from the socket. Starting from about 6x GN 1/1, three-phase current (400 V) is the standard—whether the supply cable is routed in the kitchen should be clarified before order. For locations with weak electrical supply, there are also gas-powered combi steamers.
Water: Humidification and steam generation require a 3/4-inch water connection; combi steamers additionally need a drain. With hard water, a softening system is needed beforehand, otherwise, the steam generator will scale up—more details in the guide Water Treatment.
Fumes and exhaust air: Vapours form above the device. A hood extractor or condensation attachment is part of planning for permanently installed combi steamers—basics in the guide Extractors & Ventilation.
Prices from Our Range
Exact prices for this device type are surprisingly rare online. Therefore, the real price ranges from our program (all net plus VAT):
| Device Class | Price Range at Gastro-Nik |
|---|---|
| Hot air oven without humidification | from approx. €330 |
| Hot air oven with humidification / grill function | approx. €570 – 1,300 |
| Compact combi steamer (GN 2/3) | from approx. €2,500 |
| Combi steamer 6–10x GN 1/1 | approx. €3,500 – 7,000 |
| Combi steamer with automatic cleaning | from approx. €4,400 |
| Large devices 20x GN 1/1 and GN 2/1 | €12,000 – over €28,000 |
Automatic cleaning appears to be a luxury when purchasing but saves manual work with fat remover in the hot cooking chamber every evening. Where cooking happens daily, it has quickly paid off in our experience—as shown in the article How to Clean Combi Steamers Properly.
Suitable Devices at Gastro-Nik
A cross-section through the price ranges—all devices with complete technical data:
- Hot Air Oven AT110 | Bartscher — the compact entry for baked goods
- Hot Air Oven Premium with Humidification & Grill Function | KBS — bakery quality for the café
- Hot Air Oven Euronorm 600×400 with Humidification | KBS — for bakery trays
- Combi Steamer Silversteam2 5230M | Bartscher — plug-ready combi steamer, 5x GN 2/3
- Combi Steamer AL CAPONE 5, Self-cleaning | Saro — full equipment including cleaning automation
The complete range with over 100 devices from Bartscher, KBS, Saro, Virtus and Maxima: Combi Steamers & Convection Ovens.
Frequently Asked Questions about Convection Oven & Combi Steamer
What is the difference between convection oven and combi steamer?
A convection oven operates exclusively with hot air (circulating air). A combi steamer can additionally cook with steam—separately or combined with hot air. The combi steamer is therefore more versatile; the convection oven is simpler and cheaper.
What can a convection oven do?
Baking, roasting, frying, grilling and gratinating with hot air up to 300 °C. Steaming, poaching or low-temperature cooking are not possible with a pure convection oven; for these, a combi steamer is required.
Can you bake cake in a convection oven?
Yes. Due to the even circulating air, the convection oven is very suitable for baking cakes, bread and pastries—often on several levels simultaneously.
How much does a convection oven cost?
Hot air ovens start with us at around €330 net; models with humidification range between €570 and €1,300. Combi steamers start at around €2,500 (compact, GN 2/3) and go up depending on size and features to over €28,000 for 20x GN 2/1 with boiler and self-cleaning.
Which manufacturers offer convection ovens and combi steamers?
Leading manufacturers include Rational and UNOX as well as Bartscher and Saro. At Gastro-Nik, we provide cross-brand advice and find the right device for your operation.
Which device suits what kind of business?
A convection oven is sufficient for bakeries, pizzerias and businesses focusing on baking and roasting. A combi steamer is worthwhile for restaurants, hotels, canteens and large kitchens with diverse menus.
Is a hot air oven sufficient for my café?
For baked goods, croissants, gratinated snacks and cakes: yes. A model with manual humidification additionally adds gloss to the roll surface. A combi steamer only pays off if steaming, low-temperature cooking or large-scale regeneration is done regularly.
Do I need three-phase power?
Not necessarily. Hot air ovens up to about 3 kW and compact combi steamers in the GN-2/3 format are plug-ready for 230 V. Larger combi steamers from 6x GN 1/1 usually require 400 V—or you can switch to a gas device.
What size do I need for 100 meals?
As a rule of thumb, one rack GN 1/1 produces about 8–10 meals per cooking cycle. For 100 meals in one batch, a 10x GN 1/1 is the suitable class; if served in two batches, a 6x GN 1/1 suffices.
Conclusion
The convection oven is the economical choice for businesses that mainly bake and roast. Simpler, cheaper, less maintenance.
The combi steamer is the investment for versatile kitchens. The higher acquisition costs pay off through better quality, less weight loss and more possibilities. For modern professional kitchens, it is standard today.
Your Experts for Rational & UNOX
As specialist dealers, we cooperate with the leading combi steamer manufacturers Rational and UNOX. Whether compact convection oven or high-end combi steamer for large kitchens—we advise you cross-brand and find the device that fits your business and budget.
Rational or UNOX? In our brand comparison Rational vs. UNOX we explain the differences between these two manufacturers.
Still unsure which model is right? Contact us—we will prepare a non-binding offer for you.
Combi Steamers & Convection Ovens at Gastro-Nik
Find the suitable device for your kitchen—from compact to large kitchen.
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Around 190 devices from KBS Gastrotechnik, Bartscher and Saro—from the compact hot air oven to the 20-rack combi steamer, with B2B prices and manufacturer warranty.
To the Category: Combi Steamers & Convection OvensUnsure which size fits? We gladly advise you—or directly: +49 6724 2069393.
Last updated on 22 October 2026.