The short answer to combi oven vs convection oven: a convection oven cooks with fan-forced dry heat, while a combi oven adds steam and lets you control humidity, so one cavity can roast, steam, bake and retherm. A convection oven costs far less and needs only power or gas. A commercial combi oven costs more and usually needs a water line, a drain and water treatment, but it can replace a steamer and a second oven on a busy line. Below we compare both, using real listing prices from our store.
How a convection oven works
A convection oven uses a fan to move hot air around the cavity. Ferguson’s guide on convection vs conventional ovens notes that the fan often helps food cook more evenly and more quickly, and that convection is a good fit for roasting and baking on multiple racks.
The heat is dry: great for browning, crisping and baking, less helpful for long roasts that dry out or anything you would normally steam. Some countertop units add a simple humidity feature. The Cadco XAF-113, for example, lists manual humidity control and an included auxiliary water pump kit, which sits between a plain convection oven and a true combi.
How a combi oven works
A combi (combination) oven is a convection oven with a steam system built in. Most units offer three core modes: convection (dry heat), steam, and combination, which blends the two with controlled humidity. The oven measures or manages moisture in the cavity so you can roast a protein with some steam to limit drying, then finish it dry to brown the outside.
Manufacturers claim combi cooking improves yield and moisture on proteins; test that on your own menu. The clear benefit is versatility: one combi can steam vegetables, poach fish, roast, bake bread with steam, and retherm plated meals for banquets.
Boilerless vs boiler (steam generator) combi ovens
There are two ways to make steam. A boiler style combi has a separate steam generator that boils water and feeds steam into the cavity. It generally produces more steam and recovers faster, which matters for heavy steaming. A boilerless combi sprays water into the cavity, usually onto the fan or a heated surface, to flash it into steam. Boilerless units are generally simpler, use less water and have less to descale, but they are usually better at combi cooking than at nonstop full steam. Every combi oven we link below is a boilerless model.
Combi oven vs convection oven at a glance
| Factor | Convection oven | Combi oven |
|---|---|---|
| Heat type | Fan-forced dry heat | Dry heat, steam, or both with humidity control |
| Best at | Baking, browning, roasting, sheet pan work | Proteins, steamed sides, banquets, retherm, bread |
| Utilities | Electric or gas | Electric or gas plus water supply and drain |
| Water treatment | Not needed | Usually required or strongly advised |
| Cleaning | Manual | Automatic wash on many models |
| Listing price range in our examples | $1,184.15 to $22,267 | $17,352 to $35,289 |
What each cooks best, and menu fit
Choose a convection oven if most of your oven work is dry: cookies, muffins, pizza on sheet pans, roasted potatoes, casseroles and reheating.
Choose a combi oven if your menu leans on proteins, steamed vegetables, rice, seafood, or banquet and institutional service where you retherm many plates at once.
Commercial combi oven and convection oven options we carry
All prices below are listed prices at the time of writing; prices change, so check the product page.
Countertop convection ovens
- Nemco 6240: quarter size, four 13 by 9 inch wire racks, 120V, 1.7 kW on a standard plug. Listed at $1,184.15.
- Cadco XAF-113: half size, holds three half-size sheet pans, 120V, 1.45 kW, with manual humidity control. Listed at $1,845.01.
Floor model convection ovens
- Blodgett ZEPH-100-G SGL: single deck, five full-size 18 by 26 inch pans, 50,000 BTU gas, two-speed fan. Listed at $6,799.
- Blodgett CNVX-14E SGL: fourteen 12 by 20 by 2.5 inch hotel pans or seven 18 by 26 inch pans, 208V or 240V three phase, four-speed reversible fan and a temperature probe. Listed at $22,267.
Combi ovens
- Blodgett BLCT-6E mini combi: boilerless, four 12 by 20 by 2.5 inch or five 12 by 20 by 2 inch hotel pans, 208V or 240V three phase, touch screen with 500 recipe storage and automated CombiWash. Listed at $17,352.
- Blodgett BX-14E SGL: boilerless, fourteen 12 by 20 inch hotel pans or seven full-size sheet pans, 208V or 240V three phase, Steam-on-Demand and Vario Steam humidity control, core probe. Listed at $33,691.
- Blodgett BX-14G SGL: the gas version with the same 14 hotel pan capacity, natural gas or LP. Listed at $35,289.
You can see the full lineup on our Blodgett brand page.
Countertop vs floor, full size vs half size pans
Size an oven by pans, not width. Half-size units take 13 by 18 inch sheet pans and suit low volume. Full-size units take 18 by 26 inch sheet pans or 12 by 20 inch hotel pans, which most banquet workflows assume. Countertop models save floor space; floor models such as the 14 pan Blodgett units hold far more per load.
Gas vs electric
Both types come in gas and electric. Gas suits kitchens with an existing gas line and hood. The small Nemco and Cadco ovens run on 120V, while the full-size electric units here need 208V or 240V three phase power, so confirm your service first.
Utilities and installation
- Water line: a combi needs a cold water supply for steam and cleaning.
- Drain: plan for a floor drain or approved drain connection near the oven.
- Water treatment: hard water leaves scale in steam systems, so plan for filtration or treatment. Check the spec sheet and warranty terms for water quality requirements.
- Ventilation: most units go under a hood. Some combis, like the BLCT-6E-H, are sold with a ventless hood system, but local code still decides.
- Power or gas: match voltage, phase and BTU to your service.
A licensed electrician, plumber or gas fitter and your local code have the final word on any installation.
Cleaning and energy
Convection ovens are cleaned by hand. Many combi ovens include automatic cleaning, such as CombiWash on the Blodgett mini combis, which saves labor but uses water and chemicals.
On energy, the ENERGY STAR commercial ovens page says certified commercial ovens are about 30 percent more energy efficient than standard models, and that certified combination ovens can also save water in steam and convection modes. Look for the label on either type.
Cost: what the listings show
Using our own listing prices, the gap is clear. A full-size Blodgett CNVX-14E SGL convection oven is listed at $22,267, while the boilerless BX-14E SGL combi with the same 14 hotel pan capacity is listed at $33,691, a difference of $11,424. Add plumbing, a drain and water treatment to a combi budget.
Who should buy which
Buy a convection oven if you mainly bake, roast and reheat, or lack a water line and drain. Buy a combi oven if you cook many proteins, run banquets, or want one unit to replace an oven and a steamer. Comparing faster single portion cooking instead? Read our TurboChef vs Merrychef guide. Planning the rest of the line? See our gas range sizes guide and the commercial kitchen equipment guide.
Frequently asked questions
Is a combi oven better than a convection oven?
Not always. If your menu is mostly baking and roasting, a convection oven gives similar dry heat results for far less money and without water hookups.
Can a combi oven work as a steam oven?
Yes. Combi ovens have a full steam mode for vegetables, seafood, rice and retherm. Boiler style units generally handle long, heavy steaming better than boilerless units.
Does a commercial combi oven need a water line?
Yes. Plan for a water supply, a drain and usually water filtration or treatment. A licensed plumber and local code decide how it is connected.
Not sure whether your kitchen needs a combi or a convection oven? Call us at 866-777-2590, Monday to Friday 9AM to 6PM PST, and we will help you match pan capacity, power and utilities to your menu. Orders of $999 or more ship with free freight shipping, and returns follow our return and refund policy.
