Investing in a combi oven is one of the smartest moves a commercial kitchen can make. These versatile powerhouses combine steam, convection, and combination cooking modes to deliver consistent results, save time, and reduce labour costs. But whether you're upgrading an old unit or introducing a combi oven to your kitchen for the first time, proper installation is critical to performance, longevity, and safety.
At CaterCombi, we've been refurbishing and supplying high-quality combi ovens from leading brands like Rational, Convotherm, and Lainox since 2013. We've seen countless installations – some smooth, others delayed by overlooked details. In this guide, we'll walk you through the key site requirements so you can plan ahead and avoid costly surprises.
Buying Your First Combi Oven: Planning from Scratch
If you're adding a combi oven where none existed before, you'll need to prepare your kitchen infrastructure carefully. Combi ovens have specific utility needs that go beyond a standard oven or hob.
1. Water Connection
Combi ovens rely heavily on water for steam generation, cleaning cycles, and condensation. Most models require:
- A cold water supply within 1 metre (3 feet) of the unit.
- Typically two separate connections: one for treated (softened/filtered) water used in cooking, and one for untreated water used in cleaning or condensing.
- Individual shut-off valves for each line.
- Water pressure between 2–6 bar (check your model's spec sheet).
- Water treatment is essential – hard water causes limescale buildup that can damage boilers and reduce efficiency. A filtration or softening system is usually required.
Without proper water quality and connections, your oven's performance will suffer quickly.
2. Electrical Supply
Combi ovens are power-hungry appliances:
- Smaller tabletop models may run on single-phase 230V/415V supplies.
- Larger floor models often require three-phase power (up to 40kW or more).
- Ensure your electrical panel has sufficient capacity and correctly sized breakers.
- Gas models need a suitable gas line (natural or LPG) within reach, sized to manufacturer specifications.
Always have a qualified electrician assess your supply before purchase.
3. Drainage
Steam and cleaning cycles produce condensate that must drain away:
- A floor drain or open standpipe within easy reach (but not directly beneath the oven – rising steam can damage electronics).
- Drain line typically 50mm diameter, heat-resistant, and vented to prevent siphoning.
- Some models include a condensate tray, but a proper drain is still recommended.
4. Ventilation and Clearance
Combi ovens release significant heat and steam:
- Most require placement under a Type I or II extraction hood with adequate overhang and airflow.
- Ventless/condensing models exist but still need good kitchen ventilation.
- Minimum clearances: at least 500mm on the left/right for service access, and 100–150mm at the rear.
- Keep the unit away from deep fryers or open flames to avoid grease ingress and overheating.
5. Space and Positioning
- Ensure the floor is level and strong enough to support the oven's weight (especially stacked or floor models).
- Allow space for door swing (left- or right-hinged) and easy loading/unloading of trays.
A pre-installation site survey is highly recommended for first-time buyers – many manufacturers require one for warranty validation.
Replacing an Existing Combi Oven: Check Compatibility First
If you're upgrading or replacing a tired unit, you're already ahead – your kitchen likely has most of the required services in place. However, don't assume the new oven will be a direct swap.
Key Things to Verify:
- Power rating – A newer, more efficient model might need less power, but larger capacity units could demand more.
- Water connections – Check if the existing treated/untreated lines match the new model's requirements.
- Drain position and size – Minor adjustments may be needed.
- Physical dimensions – Even "same-size" models from different brands can vary slightly in height, depth, or door swing.
- Ventilation – Modern ovens may produce less steam thanks to better condensation, potentially allowing hood adjustments.
Refurbished combi ovens from Catercombi are an excellent choice for replacements. Our units undergo a rigorous 57-point refurbishment process, come with warranty, and are often from the same brand family as your existing setup – making compatibility straightforward and cost-effective.
Final Tips for a Smooth Installation
- Always use certified installers familiar with combi ovens.
- Test your water quality early – we can advise on suitable filtration systems.
- Review the specific installation manual for your chosen model (we supply these with every oven).
- Plan for future maintenance access from day one.
Whether it's your first combi oven or your fifth, getting the installation right sets you up for years of reliable service.
Ready to upgrade? Browse our extensive stock of professionally refurbished Rational, Convotherm, Lainox, and other leading combi ovens at catercombi.com. Our team can help match the perfect unit to your existing setup or guide you through a new installation.
Contact us today on 01227 469692 or email sales@catercombi.com – we're here to make your combi journey hassle-free!