Commercial Kitchen Equipment: Combi Ovens, Cooking Lines, Cold Storage — What to Choose for a Hotel or Restaurant

When outfitting a hotel or restaurant kitchen, equipment usually gets chosen straight from a factory catalog: a combi oven “with 10 levels,” a “professional” cooking range, a stainless steel refrigerated cabinet. The sales deck rarely spells out what type of steam generation sits inside the combi oven, what ambient climate the refrigerator’s compressor is rated for, or what refrigerant runs in the circuit — and those exact parameters decide whether the line runs through its first high season without downtime, or starts failing within months in a hot, humid climate the standard Chinese line-up was never built for.

Below is a breakdown by station: heating equipment (combi ovens, ranges, grills, fryers), refrigeration and climate classes, the serving line and dishwashing, and range hoods — with real classes, power ranges, and the corners factories cut most often when producing a batch for a hospitality project.

Heated, refrigerated, neutral — three equipment groups

A commercial kitchen is usually split into groups by function, and that split determines which parameters to check:

1. Heated equipment — combi ovens, ranges, grills, fryers, griddles. Key parameters: heat source, power in kW, steam generation type.
2. Refrigerated equipment — cabinets, chest freezers, blast chillers, refrigerated prep tables. Key parameters: climate class, compressor type, refrigerant.
3. Neutral equipment — prep tables, shelving, sinks without heating or cooling. The key parameter is the stainless steel grade — covered separately in Stainless Steel 18/10: Grades 304 and 430.

The serving line (bain-marie units, hot and cold display cases), dishwashing equipment, and range hood ventilation sit apart, each with its own selection logic covered below.

Combi ovens: boiler-based or direct steam injection

The combi oven is the central station of most commercial kitchens, combining dry heat, steam, and a mix of both in one chamber. The way it generates steam drives price, water requirements, and reliability in service.

Direct injection (boilerless). A thin stream of water hits an exposed, red-hot heating element inside the cooking chamber, generating steam instantly. Upsides: fast warm-up, a compact footprint, a lower price. The downside is sensitivity to water hardness: without a softener or reverse osmosis, scale builds up on the element and injector within a few months, steam quality becomes uneven, and the heating element itself fails ahead of schedule.

Boiler-based design. Steam is generated in a separate, sealed steam generator and delivered to the chamber ready-made — more stable temperature and humidity, lower (though not zero) sensitivity to water quality, a higher price, and a longer boiler pre-heat time. This design is the more practical choice wherever load is constant and water quality is uneven — most hotels and large restaurant kitchens.

Beyond the steam-generation design, decide on:

• Capacity, measured in levels for a standard GN 1/1 pan (530×325 mm under EN 631-1): compact 6-level units for a smaller restaurant, 10–20 levels for a hotel kitchen or banquet production area.
• Control type — mechanical (a handful of programs, simple and cheap) or programmable electronic with multi-stage recipes, automatic load-weight detection, and a self-cleaning cycle. Electronic control costs 25–40% more but saves staff time and reduces variation in quality between shifts.
• Power source — electric (simpler installation, higher running cost at high electricity tariffs) or gas (cheaper to run, but requires a gas connection and a separate permit that is not approved on every site).
• Power draw — from 10–12 kW for compact electric units up to 40+ kW for large three-phase banquet combi ovens; when sizing a kitchen’s electrical load, the combi oven is usually the single heaviest line item.

Cooking ranges: gas, electric, or induction

The cooking line — ranges, grills, fryers — drives daily kitchen throughput, and here the heat source affects not only price but ventilation and electrical requirements for the whole site.

Gas. Heat transfer efficiency into cookware runs 40–55%: a share of the heat escapes into the room, so a gas line noticeably heats the kitchen and needs a more powerful hood. Upsides — familiar to cooks, works with any cookware, and gives instant visual control of the flame. Requires a proper gas connection (cylinder or mains) and a separate permit, which is not always approved in residential developments or some shopping-mall projects.

Electric (resistance element, cast-iron hob). Higher efficiency than gas (55–65%) and no gas connection needed, but a cast-iron hob heats and cools slowly — a disadvantage for precise control when dishes change quickly.

Induction. Roughly 90% efficiency — heat is generated directly in the base of the cookware through an electromagnetic field, the surrounding air barely warms up, and power response is instant. It requires cookware with a ferromagnetic base (plain aluminum or copper cookware without a steel disc does not work) and costs noticeably more, both for the induction module itself and for electronics repairs when it fails. Induction tends to get chosen where open flame is restricted, where the extraction system was sized to a minimum, or where keeping the kitchen from heating up matters in a tropical climate.

A professional induction zone draws 3.5–7 kW; across a line of 4–6 zones, the combined load quickly becomes a significant line item in the kitchen’s electrical design, and it needs to be accounted for at the design stage, not after the equipment arrives.

Refrigeration: climate class is the key parameter for the tropics

A refrigerated cabinet, prep table, chest freezer, or display case is rated for a specific range of ambient temperature and humidity at which the compressor is guaranteed to hold its set internal temperature. That rating is the climate class:

• Class N — rated for ambient air up to +32°C. The most common class on China’s domestic market, and the one factories default to unless the climate class is specified separately.
• Class ST (subtropical) — up to +38°C.
• Class 4 / 5 (tropical) — up to +40–43°C at elevated humidity.

In a kitchen without constant, powerful air conditioning in Thailand, Indonesia, or the Gulf, ambient temperature in the hot section easily exceeds +32°C, especially near the cooking line. A class N cabinet under those conditions either fails to hold its set internal temperature or runs its compressor almost continuously, sharply cutting its service life. Climate class needs to be a separate line item in the order spec — a factory will not clarify what climate the site is built for on its own.

Reliability and running cost also depend on:

• Compressor. Danfoss (Denmark, often built under license at plants in China) and Embraco/Aspera (Italy–Brazil) are considered the reliable standard for commercial equipment; unbranded Chinese compressors cost 20–30% less but fail more often within the first 2–3 years of continuous operation.
• Refrigerant. R290 (propane) is more energy-efficient and environmentally friendlier but flammable (class A3) and requires a sealed circuit; R404A and other HFC refrigerants are being phased out in the EU and, gradually, other markets due to their high global warming potential — spare parts and servicing for them are getting more expensive over time.
• Cooling type. Static (no fan, cheaper, but uneven temperature and frost buildup on the walls) versus dynamic / No Frost (a fan circulates air, temperature is more even, no frost buildup, but a higher price and more compressor-fan noise).

The serving line: bain-marie units, display cases, and the GN standard

The serving line (buffet line) holds finished dishes hot or cold until service, and here a single sizing standard governs everything — EN 631, the Gastronorm (GN) container series. The base GN 1/1 module (530×325 mm) and its fractions (1/2, 1/3, 1/6, 2/1) fit the same mounting cutouts in combi ovens, bain-marie units, refrigerated display cases, and shelving from any manufacturer — which simplifies adding to or replacing equipment without rebuilding the whole line.

Bain-marie. Holds GN pans warm for service:

• Wet heat (water bath) — water in the tray is heated and holds an even, moist temperature, but requires monitoring the water level and is harder to clean.
• Dry heat — a heating element warms the tray without water, easier to clean and needs no water top-up, but temperature is less even across the tray, and the dish comes out drier.

Refrigerated and heated display cases. For buffet service and pre-sale display, typically with tempered glass (types covered in Glass: Which Type to Choose) on cases with direct guest access. The key parameter is the ability to hold set temperature through frequent door openings during a rush — not just at rest on the factory show floor.

Dishwashing: hood-type or tunnel washer

Dishwashing equipment type is chosen by throughput, not by kitchen size:

Water at the final rinse needs to reach 80–90°C for thermal sanitation without chemicals — a standard requirement under most countries’ sanitary codes, and worth verifying separately if the site operates under a specific local certification (Thailand, UAE, EU). A boiler running a few degrees under spec is invisible on inspection, but it means dishware is only washed, not sanitized.

Range hood ventilation: filter type and airflow

The hood over a cooking line is not an optional accessory — it is part of the kitchen’s fire and sanitation safety system. Two parameters decide whether it can handle the real load:

• Grease filter type. Baffle filters trap grease through repeated changes in airflow direction, are dishwasher-safe, and are safer against fire — grease does not accumulate inside the filtering element. Mesh filters (woven wire) are cheaper but clog faster under heavy frying and grilling and hold grease less effectively on a line with open flame.
• Airflow rating, measured in cubic meters per hour per linear meter of canopy: a steam-and-boil line needs less than a line with grills, fryers, and open flame. A hood sized without matching the actual line composition either fails to clear smoke and odor, or creates excess negative pressure in the kitchen.

The kitchen also needs a matching supply of make-up air — without it, the hood creates negative pressure, pulls less than its rated capacity, and drags cold air in from adjacent zones through doors and gaps, disrupting the kitchen’s temperature balance.

Comparison: what to specify by project type

Where factories cut corners on a production batch

• Default to a class N compressor and climate rating whenever the site’s climate is not specified — the most common and least visible corner cut at order time: a refrigerated cabinet looks and performs identically on a warehouse floor in Guangzhou and in a hot kitchen in Phuket, and the difference only shows up during peak summer heat.
• Fit a direct-injection combi oven under the label of a “universal” model, without spelling out water-hardness requirements in the manual translated for the buyer — a water softener is often not included and never mentioned as a mandatory component.
• Cut corners on the hood’s grease filter, fitting mesh instead of baffle on a line with a grill or deep fryer — invisible at acceptance, but it shows up in how fast the filter clogs and in the fire risk from accumulated grease.
• Undersize the dishwasher’s boiler capacity, so rinse water never reaches 80–90°C at full machine load — dishware looks clean to the eye, but thermal sanitation never actually happens.
• Quote total line power without adjusting for the destination’s local voltage and frequency, which on a project in another country turns into swapping electrical components or overloading a circuit when all equipment runs at once.

These parameters — climate class, steam-generation design, hood filter type, dishwasher rinse temperature — are worth fixing as separate spec line items and verifying at pre-shipment inspection, rather than relying on a factory’s general model description.

Mini case: a hotel’s cold section and class N instead of tropical

A 120-room hotel in Phuket ordered a line of refrigerated cabinets and prep tables for its hot and cold sections through an intermediary who never fixed the climate class in the spec — the correspondence only covered cabinet volume in liters and unit price. The factory shipped class N units, standard for China’s domestic market.

Through the dry, cooler season, nobody noticed a difference. From April, once ambient temperature near the cooking line rose above +33–34°C even with the kitchen’s air conditioning running, part of the batch stopped holding its set internal temperature: the compressors ran almost continuously, but internal temperature periodically climbed past the safe threshold for perishable storage. In the middle of high season, the hotel had to urgently order tropical-class cabinets locally at retail price and repurpose part of the original batch for less critical duty — dry and grocery storage, where a temperature deviation matters less.

Had climate class been fixed in the contract as a separately verifiable parameter, the mismatch between the spec and the site’s requirements would have surfaced during order review, not in the middle of the season.

HS codes for kitchen equipment

Commercial kitchen equipment is declared under different codes depending on heat source and function — one of the most common sources of customs-clearance errors:

The key point of contention at the border is proving “commercial,” not “domestic,” use: duty and VAT for commercial equipment often differ from the domestic line, and customs can request technical documentation confirming the declared power and intended use. Verify current codes and rates against the official customs classification before shipment, not after the container arrives.

Sourcing kitchen equipment through Dream View

A commercial kitchen is part of the broader hotel and restaurant fit-out covered in Outfitting Hotels & Restaurants from China; the equipment’s own material — stainless steel prep tables, shelving, and work surfaces — gets fixed in the spec as a separate line item, the same way steel grade is specified in Stainless Steel 18/10: Grades 304 and 430. As with any sourcing project, orders run through an agent on a fixed 10% commission: Dream View checks climate class, steam-generation design, and refrigerant type against site requirements, verifies technical documentation before shipment, and arranges delivery to the kitchen — typically 30–45 days by sea after production.

Designing a hotel or restaurant kitchen and unsure which refrigeration climate class or combi oven design to spec for your site and climate? Reach out: orders@dreamviewchina.com, on Telegram at t.me/dreamviewchina, or submit a request on our services page — we’ll size the spec and match a factory to your volume for free.