RATIONAL® CombiMaster® (CM) - 20 x 1/1 GN, Electric
About this oven
The RATIONAL® CombiMaster® (CM) is a manual-control combi oven designed for chefs who want full control, reliability and consistent performance every day. Built to Rational's engineering standards, it covers steam, convection and combination cooking in a single cabinet, so you can roast, bake, steam, grill, poach and regenerate without switching equipment or finding floor space for a second appliance.
Where an automated combi makes the decisions, the CombiMaster® hands them to you. A mode selector with separate dials for cabinet temperature, core temperature and time means there's nothing to navigate mid-service, and anyone can be shown how to run it in five minutes.
What you get:
• Three cooking modes - steam, hot air and combination, used individually, in sequence or together, to commercial combi-steamer standard
• ClimaPlus® humidity control - the oven manages cabinet moisture automatically, without a humidity setting to adjust
• Core temperature probe - cook large joints to a precise internal finish instead of to the clock
• Multi-speed fan system - even heat distribution across a full load • Integrated steam generator - fresh steam on demand, no filling and no warm-up wait
• Seamless stainless steel cabinet with rounded corners, integrated splash guard and double-glazed door, built for fast wipe-downs at the end of service
There are no automatic cooking programmes, cleaning is semi-automatic and requires a CTU (Water treatment unit) to prevent scale. What you get in exchange is far less electronics than an automated combi: less to fail, and a large part of why these ovens are still working daily shifts twenty years after they were built.
Refurbished properly, not just cleaned up
At CaterCombi, every unit is fully refurbished by manufacturer-trained engineers, including our own 57-point inspection, deep clean, descaling and component testing to ensure dependable day-one performance. Robust German engineering, built to run for years; our job is to make sure yours starts that clock again from day one.
Available now with next-day nationwide delivery.
Features & capabilities
Full feature breakdown for this model.
| Feature | Detail |
|---|---|
| Temperature Range | ✓ 30°C–300°C |
| Cooking Modes | ✓ Three core modes: convection (dry heat), steam (100% humidity), and combination (simultaneous heat + steam) |
| Humidity / Steam Control | ✓ Manual |
| Programmable Cooking | ✓ No |
| Fan Speed Control | ✓ Fixed fan speed |
| Core Temperature Probe | ✓ Yes |
| Cleaning System | ✓ Semi automatic |
Tech Specs
Full technical specification pulled directly from product metafields.
| Product | |
| Make | Rational |
| Model | CombiMaster® (CM) |
| Type | 20 Grid |
| SKU | N/A |
| Condition | Professionally refurbished |
| Power & Electrical | |
| Power Supply | 3 Phase Electric |
| Supply Details | 3 Phase Electric - 37 kw load - 50/60Hz - 400V supplied with cable, direct hardwire recommended. Water & Drainage connection required. |
| Dimensions & Capacity | |
| Dimensions (W×D×H) | 880mm wide x 800mm deep x 1800mm high |
| Capacity & Pan Configuration | 1/1 GN or 600 x 400 mm trays |
| Warranty | |
| Warranty | 3 months Parts Warranty |
| Extended Warranty | Available on request — call 01227 469692 |
Installation & connections
What your kitchen fitter or site needs to have ready before delivery.
| Water Supply | |
| Connection | Direct feed - one 3/4" feed. When using a CTU, it is recommended to adjust to two 3/4" feeds. |
| Flow Pressure | 1.5 - 6.0 bar |
| Drainage | |
| Waste Connection | Tundish and Drain Kit recommended for XS, 6 and 10 grid. Floor drainage or Drain Pump and Drain Kit needed for 20 and 40 grid units. |
| Clearance & Access | |
| Side Clearance | Minimum 350mm recommended for servicing (500mm if a heat source is adjacent) |
Delivery, collection & warranty
Everything you need to know before your oven arrives.
What every oven goes through before sale
- 57-point planned preventative maintenance (PPM) schedule by our qualified catering engineers
- Full service checklist provided — list of all parts changed available to keep
- Oven can be viewed working via video call or in-person at our Canterbury warehouse
- 3 months Parts Warranty included as standard
- Extended warranties available — call 01227 469692 for details
- Warranty valid only when installed by a fully qualified catering engineer per manufacturer guidelines
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