By Kai Nakamura · Production roaster & equipment editor · Updated 2026-09-21
Probat P05 III vs Diedrich IR-5
The gold-standard German shop roaster built for ultimate thermal stability and legendary resale value. · The American-made profile master offering unmatched small-batch flexibility and infrared burner control.
The Probat P05 III is the ultimate choice for established businesses seeking a heavy-duty, highly repeatable production machine with unmatched brand prestige. The Diedrich IR-5 is the superior…
Also searched: Diedrich IR-5 vs Probat P05 III
Decision picker
Specification matrix
| Spec | Probat P05 III | Diedrich IR-5 |
|---|---|---|
| Batch Capacity | 1–6 kg (Optimized for 5 kg) | Up to 5 kg (Excellent low-end) |
| Hourly Output | ~17 kg/h | ~18 kg/h |
| Heating Technology | Traditional gas or electric options | Infrared burners (highly responsive) |
| Minimum Batch Size | Less optimized for sub-1.5kg loads | Highly capable for small test/sample batches |
| Roaster Weight | 440 kg (plus 50 kg cyclone) | 400 kg (empty) |
| Footprint & Layout | 1,567 x 1,077 x 1,854 mm (Cyclone separate) | Compact floor model (Integrated footprint) |
| Documentation & Guides | Dealer-dependent, more fragmented | Highly accessible online manuals & guides |
| Thermal Stability | Exceptional (high thermal mass drum) | Highly responsive (faster profile adjustments) |
Batch Capacity
Probat P05 III
1–6 kg (Optimized for 5 kg)Diedrich IR-5
Up to 5 kg (Excellent low-end)Hourly Output
Probat P05 III
~17 kg/hDiedrich IR-5
~18 kg/hHeating Technology
Probat P05 III
Traditional gas or electric optionsDiedrich IR-5
Infrared burners (highly responsive)Minimum Batch Size
Probat P05 III
Less optimized for sub-1.5kg loadsDiedrich IR-5
Highly capable for small test/sample batchesRoaster Weight
Probat P05 III
440 kg (plus 50 kg cyclone)Diedrich IR-5
400 kg (empty)Footprint & Layout
Probat P05 III
1,567 x 1,077 x 1,854 mm (Cyclone separate)Diedrich IR-5
Compact floor model (Integrated footprint)Documentation & Guides
Probat P05 III
Dealer-dependent, more fragmentedDiedrich IR-5
Highly accessible online manuals & guidesThermal Stability
Probat P05 III
Exceptional (high thermal mass drum)Diedrich IR-5
Highly responsive (faster profile adjustments)Values from manufacturer documentation and dealer quotes. Confirm lead times, install kits, and utility requirements before purchase.
Strengths & trade-offs
Probat P05 III
- Legendary German build quality with high thermal mass for rock-solid repeatability.
- Excellent brand recognition yielding superior long-term resale value.
- Clear, explicit physical dimensions and utility specs for straightforward build-out planning.
- Very high initial capital acquisition cost.
- Less flexible for roasting very small sample or test batches under 1.5 kg.
Diedrich IR-5
- Outstanding batch flexibility with a wide operating range down to small test sizes.
- Infrared burner technology provides highly responsive, precise profile control.
- Excellent, transparently indexed online documentation and user manuals.
- Requires high operator discipline; less forgiving of profile mistakes.
- Exhaust and ventilation setup can be highly complex for first-time installers.
Deep dives
At a glance
Choosing between the Probat P05 III and the Diedrich IR-5 is a defining decision for any startup specialty roastery. Both are elite 5 kg class floor models, but they approach the craft with distinct engineering philosophies. The German-engineered Probat P05 III is a heavy-duty production workhorse, prized for its exceptional thermal mass, predictable drum dynamics, and rock-solid resale value.
Where they diverge
Conversely, the American-built Diedrich IR-5 utilizes infrared burners and highly responsive airflow controls, making it the darling of roasters who prioritize profile development and small-batch flexibility. While the Probat excels at back-to-back production consistency near its maximum capacity, the Diedrich offers a more forgiving low-end range for roasting test batches under 1 kg.
How we researched this pair
Informed by technical spec sheets for the Probat P05 III and Diedrich IR-5 operator manuals. Evaluated key commercial metrics including batch flexibility, physical footprint, utility requirements, and recurring owner feedback regarding thermal control and maintenance.
What buyers report
Probat owners consistently praise the machine's tank-like build quality and predictable thermal stability. It is widely regarded as a 'set-it-and-forget-it' production workhorse that holds its value incredibly well. However, buyers frequently note that the high upfront cost and dealer-dependent service model can be intimidating for small startups with inconsistent initial volumes.
Diedrich IR-5 operators rave about the machine's responsiveness and its ability to handle tiny sample roasts alongside full production batches. The infrared heat control is highly praised for producing clean, sweet profiles. On the downside, users caution that the learning curve is steep, and buying a used unit requires meticulous inspection of the burners and airflow systems.