RATIONAL® CombiMaster® Plus (CMP) 20 x 2/1, Gas
About this oven
The RATIONAL® CombiMaster® Plus (CMP) is a manual-control combi oven for chefs who want full control over the cooking and none of the work around it. Steam, convection and combination cooking in a single cabinet: roast, bake, steam, grill, poach and regenerate without switching equipment or finding floor space for a second appliance.
You stay in charge of the cooking. The oven handles everything else: it measures its own humidity, stores your recipes, and cleans itself at the end of service. The only thing it needs is a CTU (Water Treatment unit) to prevent scale in areas with hard water.
What you get:
• Three cooking modes - steam from 30–130°C, hot air from 30–300°C, combination from 30–300°C
• ClimaPlus® - the oven measures cabinet humidity and regulates it across five stages, rather than simply running a setting
• Five programmable air speeds - low and intermittent for soufflés, custards and delicate fish; full power for loaded roasting racks
• Core temperature probe - cook to a precise internal finish, particularly on overnight and large-joint work
• Recipe storage - build multi-step programmes of up to six steps so a dish runs identically whoever's on the section, and transfer programmes by USB
• Finishing® mode - hold and finish plated service, buffets and banqueting covers without drying them out
• CleanJet® automatic cleaning - three programmes matched to actual soiling levels, using drop-in tabs, plus scale detection that tells you when a descale is due
• Built for real kitchens - integrated hand shower with automatic retraction, centrifugal grease extraction with no filter to clean, rapid cool-down, HACCP logging, LAN connectivity, and a double-glazed heat-reflecting door
• Stainless steel throughout, with a seamless cabinet and rounded corners for fast wipe-downs at the end of service
Honest about what it isn't
The CMP has no automatic cooking programmes; it won't decide a roasting profile for you the way a SelfCookingCenter will. That's the point. It also means fewer electronics than an automated combi, so there's less to fail over a long service life.
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 | ✓ Semi-Automatic with 5 levels |
| Programmable Cooking | ✓ Yes, with manual dials - Watch video |
| Fan Speed Control | ✓ Variable fan speeds (5 speeds) |
| Core Temperature Probe | ✓ Yes |
| Cleaning System | ✓ Semi automatic |
Tech Specs
Full technical specification pulled directly from product metafields.
| Product | |
| Make | Rational |
| Model | CombiMaster Plus CMP |
| Type | 40 Grid |
| SKU | 4168 |
| Condition | Professionally refurbished |
| Power & Electrical | |
| Power Supply | Gas |
| Supply Details | Natural Gas or LPG - 1.6kw load - 50/60Hz - 230V supplied with 16A plug |
| Dimensions & Capacity | |
| Dimensions (W×D×H) | W 1084mm x D 996mm x H 1782mm |
| 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
Product videos
See this oven in action — walk-throughs, features and demonstrations.


