The right commercial oven is the one that matches your menu, your peak-hour volume and your building, in that order. Pick the type first (convection, combi or speed), size it for your busiest service rather than an average day, then check gas or electric supply, ventilation and total running cost before you look at the price tag. This guide takes you through each step as a UK buyer, with the checks that most often catch people out.
TL;DR
- Match the oven type to the food: convection for bakes and roasts, combi for steam plus dry heat and the widest menu, speed ovens for fast reheating and finishing.
- Size for your busiest hour, not your average day, and count trays or grids, not litres.
- Check your power supply, gas connection and ventilation before ordering. Gas appliances must be fitted by a Gas Safe registered engineer.
- Compare total cost of ownership (energy, cleaning, servicing, installation), not just the purchase price.
- Spreading the cost through finance or leasing can make a better oven affordable now, but only if the numbers work for your cash flow.
Table of Contents
- Start with what you cook, not with the brochure
- The main types of commercial oven
- Capacity: count trays, not litres
- Gas or electric, and what your building can supply
- Ventilation: the cost people forget
- Controls, cleaning and ease of use
- Running costs and total cost of ownership
- Perspective: what we see when businesses choose an oven
- Brands and warranty
- Buying from us: range, advice and installation
- A short checklist before you order
- FAQ
- Sources
Start with what you cook, not with the brochure
Most bad oven purchases begin with a spec sheet instead of a menu. Write down the ten things you bake, roast or finish most often, then note how many portions or trays you need in your busiest hour. That one page tells you more than any brand comparison.
A few questions sharpen it:
- Do you bake from raw dough or finish pre-prepared items?
- Do you need moisture (steaming, proving, rethermalising) or only dry heat?
- Is the oven doing one job all day, or five different jobs across breakfast, lunch and evening service?
- Who is operating it: trained chefs, or rotating junior staff who need preset programs?
The answers point you towards one of three main families of oven.
The main types of commercial oven
Convection ovens
A fan moves heated air around the cabinet, so heat is even and cooking is quicker than in a static oven. They suit bakery goods, roasting, traybakes and general kitchen work, and they are usually the simplest and most affordable way into professional baking. If you are weighing one for a bakery, our UK buyer’s guide to convection ovens for bakeries goes deeper, and the complete guide to convection ovens for catering kitchens covers the catering side.
Browse our convection ovens and bakery ovens to see the range, from compact counter-top units to larger grid-based models.
Combi ovens
A combi oven (combination oven) cooks with steam, dry hot air or both together. That makes one machine capable of roasting, baking, steaming, poaching, grilling and regenerating food. Rational describes its iCombi Pro, for example, as a connectable cooking system with operating modes for poultry, meat, fish, egg dishes, side dishes and baked goods, alongside roasting, cooking, baking and grilling methods.
Combi ovens cost more up front than convection ovens, but they can replace several pieces of kit and give consistent results with less supervision. They are the usual choice for restaurants, hotels, catering operations and any kitchen with a varied menu. We stock Rational and Unox combis, including the Rational iCombi Classic 10-1/1 Electric and the Rational iCombi Pro 20-1/1 Electric, plus gas versions such as the iCombi Classic 10-1/1 Gas and the iCombi Pro 20-1/1 Gas. Our Unox combi ovens page covers the other major option.
Speed ovens
Speed ovens combine technologies such as high-velocity air, microwave or infrared to cook or finish food in a fraction of the usual time. They are built for cafes, coffee shops, food-to-go counters and bars where a toastie, panini, pastry or hot plate has to leave the pass in minutes. They are not a replacement for a bakery deck or a combi, but for fast, repeatable finishing they are hard to beat. See the Unox Speed X page for one example.
Which type fits which business?
| Business | Usual best fit | Why |
|---|---|---|
| Independent bakery | Convection or bakery oven | Even bake across several trays, good value per tray |
| Restaurant with varied menu | Combi oven | Steam and dry heat in one cabinet, programmable |
| Cafe or coffee shop | Speed oven, small convection or both | Fast finishing in a small footprint |
| Caterer or event kitchen | Combi or convection | Batch cooking, regenerating, versatility |
| Food truck | Compact, lower-kW convection or combi | Limited power and space |
The table is a starting point. A cafe doing full breakfasts might want a combi, and a bakery with a small range might never need one.
Capacity: count trays, not litres
Capacity in a commercial oven is measured in trays or grids, and the size standard matters. Gastronorm (GN) sizes such as 1/1 are common in combi ovens, while bakeries often work with 600 x 400 mm trays. Check that the trays you already own, or plan to use, fit the oven you are considering.
A practical way to size it:
- Estimate the number of portions or loaves you need in your busiest hour.
- Work out how many portions or items fit on one tray.
- Note how long a typical batch takes to cook.
- Divide: that gives the trays per hour you need.
- Add headroom for growth and busy days.
For bakeries we suggest planning for headroom rather than the bare minimum. Our guide on sizing a bakery oven for 1.5 times demand shows how to do the sum from your menu. If you are just opening, the bakery startup oven checklist covers tray fit and site checks.
An oven that is too small becomes a bottleneck at peak time and forces staff to run extra batches. One that is far too large wastes energy and floor space. Aim for roughly full use at your busiest service.
Gas or electric, and what your building can supply
This is where purchases most often go wrong. An oven that suits your menu may not suit your premises.
Electric ovens and your supply
Small counter-top convection ovens often run from a standard 13A socket or a dedicated single-phase circuit. Larger combi and floor-standing ovens usually need a higher-rated or three-phase connection. One electrical guide notes that most commercial kitchens need a three-phase supply, with 100A three-phase giving roughly 69 kW against about 23 kW on single-phase. Check the kW rating on any oven you are considering against what your electrician says the premises can carry. Ratings vary widely: the counter-top Lincat Convector Touch CO133T is a 3.0 kW unit, while the CO235T is rated at 4.8 kW.
Gas ovens and the law
Gas can be cheaper to run per kWh and suits kitchens with an existing gas supply, but it brings legal duties. The HSE warns that if gas appliances such as ovens are not properly installed and maintained there is a danger of fire, explosion, gas leaks and carbon monoxide poisoning. Work on catering gas appliances is subject to the Gas Safety (Installation and Use) Regulations 1998, which means installation by a Gas Safe registered engineer, with the right type of registration for commercial catering equipment. Ask for that qualification before anyone touches the pipework. Your engineer should also confirm the ventilation and interlock requirements for your kitchen.
Ventilation: the cost people forget
Every oven puts heat, steam and sometimes grease into the room. Under a gas appliance, ventilation is also a safety system. The HSE’s catering guidance explains that ventilation in catering kitchens is a joint concern of employers and enforcement bodies, and its gas safety guidance points to extraction being interlocked with the gas supply.
If your kitchen has no suitable canopy or extraction, you may need to budget for it. Our cafe oven choice guide explains how a ventilation requirement can add £3,000 to £8,000 to a cafe project, which is more than some ovens cost. Some combi and speed ovens have condensation hoods or ventless options, but whether one is acceptable in your premises is a question for your installer and, where relevant, your landlord and local authority.
Two more site checks help: door swing and clearance, and whether the oven can physically reach its position. Our commercial oven placement guide from a UK installer’s perspective and the three site checks that decide oven fit walk through measuring, access and clearances.
Controls, cleaning and ease of use
A good oven is one your team can operate correctly at 7am on a Saturday.
- Controls: manual dials are simple and robust. Touchscreen and preset-programme ovens give repeatable results and reduce reliance on one experienced chef. The Lincat Convector Touch range, for instance, adds touch controls to counter-top convection.
- Programmes and connectivity: stored recipes, multi-stage baking and remote monitoring are worth paying for if you run several staff or multiple sites.
- Cleaning: combi ovens often have automatic cleaning cycles that use specific detergent and descaler. That is a running cost to count, and we stock detergent and warewashing products to go with them.
- Door and cavity design: removable seals, rounded corners and accessible racks save time every day.
If you are choosing a Unox oven, remember the accessories: installation kits, stands, grids and trays are often sold separately and should be part of your budget.
Running costs and total cost of ownership
The purchase price is one line in a longer bill. Over several years, energy, cleaning products, servicing, water treatment and downtime can matter as much. Our commercial oven total cost guide puts typical UK annual costs in the range of £450 to £3,000 or more, depending on oven type and usage, and three worked running cost examples show how to calculate your own.
A simple method:
- Take the oven’s kW rating and estimate hours of real use per day.
- Multiply by your unit price per kWh from your latest business energy bill.
- Multiply by trading days per year.
- Add cleaning chemicals, descaling and servicing.
- Compare the figure across the models on your shortlist.
Note that ovens do not draw their full rating continuously, so this gives a cautious upper estimate. A more efficient oven may justify a higher price within a couple of years, particularly in a kitchen that runs all day.
Perspective: what we see when businesses choose an oven
We sell convection, combi and speed ovens from Rational, Unox, Merrychef and other makers, and the same patterns come up again and again.
First, the menu should lead. Buyers who start from a brand name often end up with either too much oven or the wrong kind. A bakery that mostly bakes bread and pastries is usually better served by a good convection or bakery oven than by a combi it will use at a fraction of its ability. A restaurant with a broad menu, on the other hand, often finds a combi earns its place because one machine takes over several jobs.
Second, the building decides as much as the brochure. We would rather have you measure the doorway, check the electrics and speak to a Gas Safe engineer before you order than discover a ventilation or supply problem after delivery. That is why we offer expert advice and installation, and why we point customers towards site checks first.
Third, payment flexibility is part of the choice. A premium oven that cuts waste and speeds service can pay for itself, but not every business wants to tie up capital at once. We offer flexible payment options through iwocaPay and lease finance so you can match the cost to your cash flow.
Our advice in one line: choose the oven your menu and premises need, then the finance that suits your business, not the other way round.
— Simon
Brands and warranty
The People Also Ask question about the best brand has no single answer, because it depends on the job. In broad terms:
- Rational is known for its iCombi combination ovens, with intelligent cooking modes and connectivity.
- Unox offers combi, convection and bakery ovens, including the Bakerlux range, and has a broad accessory range. See the Unox Bakerlux SHOP.Pro Master Arianna.Matic 4-grid convection oven.
- Merrychef is associated with speed ovens for fast, high-volume finishing.
- Lincat makes counter-top convection ovens that suit smaller kitchens.
Whichever you choose, buy a genuine product from a reputable supplier, ask what the manufacturer’s warranty covers (parts, labour, call-out), and find out who will service it. A cheap oven with no local service route is a risk in a kitchen that cannot stop.
Buying from us: range, advice and installation
If you are ready to shortlist, start with our commercial ovens collection. It covers convection, combi and speed ovens along with compatible accessories such as installation kits, oven stands, grids and trays. Our team gives personalised advice on which oven suits your kitchen, and we can arrange professional installation. If you are not sure where to start, tell us your menu, your busiest hour and your site details through our store and we will help narrow the options. Payment can be spread with iwocaPay or lease finance.
A short checklist before you order
- Menu and peak volume written down.
- Oven type chosen: convection, combi or speed.
- Tray or grid count calculated with headroom.
- Electrical supply confirmed by an electrician, or gas supply by a Gas Safe engineer.
- Ventilation and extraction checked.
- Doorways, access routes and clearances measured.
- Running costs estimated using your own energy price.
- Accessories, installation kit and stand included in the budget.
- Warranty and servicing understood.
- Payment or lease option compared with your cash flow.
FAQ
What is the difference between a commercial oven and a regular oven?
A commercial oven is built for long hours, heavy use and fast recovery between loads, with sturdier components, higher power ratings and often steam, programmable controls or multiple racks. Domestic ovens are not designed for that duty and are unlikely to cope with a professional kitchen. Commercial ovens also carry installation requirements, such as three-phase power or gas safety and ventilation, that a home oven does not.
Which oven is best for commercial use?
It depends on what you cook. Convection ovens suit bakeries and general kitchens, combi ovens suit varied menus that need steam and dry heat, and speed ovens suit fast finishing in cafes and food-to-go. Start with your menu and your busiest service, then choose the type and size to match.
What should you look for when buying an oven?
Look at capacity in trays, power or gas requirements, ventilation needs, controls, cleaning method, running costs and warranty. Check your premises can support the oven before you order, including access and clearances. Our checklist above covers each step.
Can I finance a commercial oven?
Yes. We offer flexible payment through iwocaPay and lease finance options. Whether finance beats paying outright depends on your cash flow and the terms you are offered, so compare the total cost over the whole period before you commit.
Sources
- Gas safety for employers, HSE
- Catering Information Sheet No 23: Gas safety in catering and hospitality, HSE
- Catering Information Sheet No 10: Ventilation in catering kitchens, HSE
- Rational iCombi Pro product description
- Restaurant electrical requirements guide