Combi Steamer vs. Convection Oven - Differences Explained
Combi steamers and convection ovens are often confused, but they are different devices. The combi steamer is the advanced version of the convection oven with 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 fan oven) is a professional cooking device that works with circulating hot air. A fan distributes heated air evenly in the cooking chamber, allowing several trays to cook simultaneously and evenly. Convection ovens reach temperatures up to 300 °C and are ideal for baking, roasting, grilling and gratinating. They have a simpler design, are cheaper to buy and require less maintenance than a combi steamer – but cannot steam.
Typical areas of use include bakeries, patisseries, pizzerias, snack bars and large kitchens focusing on baked goods and roasts. Well-known manufacturers include Rational, UNOX, Bartscher and Saro.
What is a Combi Steamer?
A combi steamer is the advanced version of the convection oven: it combines hot air and steam – individually or together. This allows it not only to bake and roast but also to steam, cook, poach, regenerate and prepare sous-vide. A combi steamer thus replaces several devices and is standard in modern professional kitchens today.
The Key Differences
Convection Oven
The Hot-Air Specialist
- Works only with hot air (circulating air)
- Temperatures up to 300°C
- Ideal for baking, roasting, grilling
- Simpler technology
- Cheaper to purchase
- Less maintenance
Price: from approx. €330 net
Combi Steamer
The All-Rounder
- Hot air AND steam (combinable)
- Temperatures 30-300°C
- Can steam, bake, roast, cook, regenerate
- More complex technology
- Higher purchase costs
- 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 | ✗ No | ✓ Yes |
| Regenerating | △ Limited | ✓ Yes (without drying out) |
| Poaching | ✗ No | ✓ Yes |
| Braising | △ Limited | ✓ Yes (optimal) |
When to Choose Which Device?
Convection oven is sufficient for:
- Bakeries (rolls, bread, cake)
- Pizzerias (in addition to the pizza oven)
- Snack bars focused on baking/roasting
- Operations 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 through 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
Read even more details in 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 | Required regularly |
Which Design for Which Operation?
| Operation | Typical Need | Suitable Design |
|---|---|---|
| Snack bar, kiosk, petrol station | Proofing, snacks, gratinating | Hot-air oven without steam function |
| Café, bakery branch, hotel breakfast | Baked goods with shine and volume | Hot-air oven with steam function |
| Bistro, restaurant up to approx. 60 meals | Full cooking spectrum on small footprint | Combi steamer 5–6 shelves |
| Restaurant, hotel kitchen, catering | Meat, fish, side dishes in parallel | Combi steamer 6–10x GN 1/1 |
| Canteen, large kitchen, banquet | Hundreds of meals in batch | Combi steamer 10–20x GN 1/1 or GN 2/1 |
The steam function is the underestimated compromise. Those who mainly bake do not need a full combi steamer: a hot-air oven with manual steam and grill feature costs about €600 net with us and delivers rolls with shine and crust — a fraction of what a combi steamer costs.
Size: Understanding Trays and GN Shelves Correctly
The size specification lies in the shelf standard, and here a close look pays off, because two worlds exist side by side:
Baking trays: Compact hot-air ovens accommodate 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 by GN containers — GN 1/1 measures 530 × 325 mm, GN 2/1 is double. "6x GN 1/1" means six shelves 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. Which GN sizes exist and how they are divided is explained in the overview GN Container Sizes.
Rule of thumb per GN 1/1 shelf: about 8–10 meals per cooking cycle. A 6-shelf device serves about 50–60 meals at once, a 10-shelf about 100.
Connection and Installation
Electricity: Small hot-air ovens and compact combi steamers in GN-2/3 format run on 230 V from the socket. From around 6x GN 1/1, three-phase current (400 V) is standard — whether the supply line is in the kitchen should be clarified before ordering. For locations with weak power supply, there are also combi steamers with gas operation.
Water: Steam function and steam generation require a 3/4-inch water connection; combi steamers additionally require a drain. In case of hard water, softening is necessary beforehand, otherwise the steam generator scales up — more details in the guide Water Treatment.
Fumes and exhaust air: Steam forms above the device. A hood extractor or condensation attachment is part of the planning for permanently installed combi steamers — basics in the guide Extractors & Ventilation.
Prices from our Range
Concrete prices for this device type online are surprisingly rare. Therefore, real price ranges from our program (all net plus VAT):
| Device Class | Price Range at Gastro-Nik |
|---|---|
| Hot-air oven without steam function | from approx. €330 |
| Hot-air oven with steam & grill function | approx. €570 – €1,300 |
| Combi steamer compact (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 seems like a luxury on purchase but saves manual work with grease remover in the hot cooking chamber every evening. Where cooking is daily, it quickly pays off — how manual cleaning works is shown in the article How to Clean a Combi Steamer Properly.
Suitable Devices at Gastro-Nik
An overview through the price classes — all devices with complete technical data:
- Hot-Air Oven AT110 | Bartscher — the compact entry-level for proofed goods
- Premium Hot-Air Oven with Steam & Grill Function | KBS — baker’s quality for cafés
- Hot-Air Oven Euro Norm 600×400 with Steam | 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 Ovens & Combi Steamers
What is the difference between convection oven and combi steamer?
A convection oven works exclusively with hot air (circulating air). A combi steamer can additionally cook with steam – individually or combined with hot air. The combi steamer is therefore more versatile, the convection oven simpler and cheaper.
What can a convection oven do?
Bake, roast, grill and gratinate with hot air up to 300 °C. Steaming, poaching or low-temperature cooking are not possible with a pure convection oven – a combi steamer is needed for that.
Can you bake cake in a convection oven?
Yes. Thanks to the even circulating air, the convection oven is very suitable for baking cakes, bread and pastries – often on multiple levels simultaneously.
How much does a convection oven cost?
Hot-air ovens start with us at around €330 net, models with steam function range between €570 and €1,300. Combi steamers start at about €2,500 (compact, GN 2/3) and range depending on size and features up to over €28,000 for 20x GN 2/1 with boiler and self-cleaning.
Which manufacturers make convection ovens and combi steamers?
Leading manufacturers include Rational and UNOX as well as Bartscher and Saro. At Gastro-Nik we advise cross-manufacturer and find the right device for your operation.
Which device suits which operation?
A convection oven is sufficient for bakeries, pizzerias and operations focusing on baking and roasting. A combi steamer is worthwhile for restaurants, hotels, canteens and large kitchens with versatile menus.
Is a hot-air oven enough for my café?
For proofed goods, croissants, gratinated snacks and cakes: yes. A model with manual steam function additionally gives shine to the roll surface. A combi steamer is worthwhile only when 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 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 opt for a gas device.
What size do I need for 100 meals?
As a rule of thumb, one GN 1/1 shelf yields about 8–10 meals per cooking cycle. For 100 meals at once, a 10x GN 1/1 is the right size; serving in two waves you can manage with a 6-shelf device.
Conclusion
The convection oven is the economical choice for operations that mainly bake and roast. Simpler, cheaper, less maintenance.
The combi steamer is the investment for versatile kitchens. The higher purchase costs are amortized through better quality, less weight loss and more possibilities. It is standard in modern professional kitchens 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 across manufacturers and find the device that fits your operation and budget.
Rational or UNOX? In our brand comparison Rational vs. UNOX we explain the differences between the two manufacturers.
Still unsure which model is right? Contact us – we will provide you with a non-binding offer.
Combi Steamers & Convection Ovens at Gastro-Nik
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Last updated on 22 October 2026.