The Roaster Desk

By Kai Nakamura · Production roaster & equipment editor · Updated 2026-09-21

Loring S15 Kestrel vs Probat P12 III

A highly automated, ultra-efficient convection roaster with an integrated afterburner, built for modern specialty coffee consistency. · The gold standard of traditional drum roasting, offering unmatched tactile control, heavy body development, and legendary German engineering.

↔ Split verdict

The choice between these two industry giants comes down to your business model and roasting philosophy. The Loring S15 is the ultimate modern production workhorse, offering unmatched fuel…

Batch Capacity → S15 KestrelFuel Efficiency → S15 KestrelPollution Control → S15 Kestrel

Also searched: Probat P12 III vs Loring S15 Kestrel

Decision picker

For most buyers, we lean toward either platform depending on constraints. Which sounds closer to you?
Power users chasing control, throughput, or automation depth usually land on Loring S15 Kestrel. Your pick?
If capital outlay is the deciding factor, Probat P12 III usually wins. Agree?

Specification matrix

Batch Capacity

Loring S15 Kestrel

3 kg to 15 kg (6.6 to 33 lbs)

Probat P12 III

1 kg to 12 kg (2.2 to 26 lbs)

Heat Transfer Style

Loring S15 Kestrel

Convection-dominant (recirculating hot air)

Probat P12 III

Conductive-heavy drum + convection

Fuel Efficiency

Loring S15 Kestrel

Ultra-efficient single-burner (up to 80% gas savings)

Probat P12 III

Standard drum (up to 4x gas usage with separate afterburner)

Pollution Control

Loring S15 Kestrel

Integrated afterburner-effect in main burner

Probat P12 III

Requires separate external afterburner and cyclone

Control & Automation

Loring S15 Kestrel

12" Touchscreen, automated profile replay, gas, and discharge

Probat P12 III

Digital profile logging with manual, tactile gas/airflow control

Footprint & Siting

Loring S15 Kestrel

Compact floor space, tall vertical profile; easy urban permitting

Probat P12 III

Larger footprint due to separate cyclone/afterburner; complex ducting

Cup Profile Signature

Loring S15 Kestrel

Clean, uniform, high clarity, highlighted acidity

Probat P12 III

Heavier body, classic texture, excellent blend development

Hourly Throughput

Loring S15 Kestrel

~100–125 lbs/hr roasted

Probat P12 III

~40 kg/hr (~88 lbs/hr) roasted

Values from manufacturer documentation and dealer quotes. Confirm lead times, install kits, and utility requirements before purchase.

Strengths & trade-offs

Loring S15 Kestrel

  • Exceptional fuel efficiency, reducing gas consumption by up to 80% compared to traditional setups.
  • Integrated afterburner simplifies urban permitting and eliminates the need for separate external pollution control.
  • Advanced automation allows for highly repeatable profile replays, reducing operator labor.
  • Steep learning curve for roasters transitioning from traditional conductive drum roasters.
  • Unintuitive burner control quirks (e.g., minimum burner settings where 20% acts as 0%).

Probat P12 III

  • Classic drum roasting dynamics provide excellent conductive heat transfer and rich body development.
  • Highly tactile, manual control over gas, airflow, and drum speed for hands-on craft roasting.
  • Excellent flexibility for varying batch sizes, handling micro-lots down to 1 kg easily.
  • Significantly higher gas consumption, especially when paired with a separate afterburner.
  • Larger physical footprint required once separate cyclone and ducting are installed.

Deep dives

At a glance

The Loring S15 Kestrel and Probat P12 III represent two fundamentally opposing philosophies in commercial coffee roasting. The Loring S15 is a modern, convection-dominant, single-burner machine that recirculates hot air to roast beans, integrating an afterburner directly into its compact, tall chassis. It is highly automated, incredibly fuel-efficient, and engineered for clean, high-clarity cup profiles.

Where they diverge

In contrast, the Probat P12 III is a classic gas-fired drum roaster that relies heavily on conductive heat transfer. It offers a tactile, hands-on roasting experience favored by traditionalists, producing coffees with a heavier body and rich, complex development. While the Probat requires separate pollution control and occupies a larger footprint, its legendary build quality and classic roast dynamics remain the benchmark for many specialty roasters.

How we researched this pair

Based on manufacturer specifications, independent fuel consumption studies comparing recirculating vs. traditional drum systems, and feedback from professional roasters operating both machines. Special attention was paid to the thermal dynamics of convection vs. conduction and the practical implications of integrated vs. external afterburners in urban environments.

What buyers report

Buyers love the Loring S15 for its sheer speed, power, and labor-saving automation. Operators frequently praise how easy it is to multi-task during a roast cycle once profiles are locked in. The environmental and fuel savings are major highlights, especially for urban roasteries facing strict emissions standards. However, some traditional roasters note a steep learning curve when adapting to its convection-heavy thermal dynamics, and some complain about minor control quirks at low burner percentages.

Probat P12 III owners express deep satisfaction with the machine's reliability and classic 'drivable' feel. It is widely celebrated as a true craftsman's tool, giving the operator complete tactile feedback. Roasters appreciate the heavy body and rich texture it coaxes out of coffees, particularly for espresso blends. The main drawbacks discussed are the high fuel costs, the massive footprint of the separate cyclone/afterburner setup, and the lack of advanced automated drop/charge features.

FAQ

Does the Loring S15 really save 80% on gas?
Yes, in comparisons with traditional drum roasters paired with separate afterburners. Loring's single-burner design recirculates superheated air to both roast the coffee and incinerate smoke, eliminating the need for a second fuel-hungry burner.
Can the Probat P12 III run automated profiles?
The P12 III features digital profile management and integrates well with software like Cropster for tracking, but it is fundamentally designed for manual, tactile control. It lacks the fully automated charge, gas adjustments, and discharge capabilities of the Loring.
Which roaster is better for light-roasted specialty coffee?
The Loring S15 is highly favored for light roasts because its convection-dominant heat transfers energy evenly without scorching, resulting in high clarity and bright acidity. However, some roasters still prefer the conductive contact of the Probat drum to add body to light roasts.
How do the footprints of these two machines compare?
The Loring S15 has a compact but tall footprint because its afterburner and cyclone are integrated into the main chassis. The Probat P12 III requires a separate cyclone and, if needed, an external afterburner, which significantly increases the overall floor space and ducting complexity.
What is the minimum batch size for both roasters?
The Loring S15 has a minimum batch size of about 3 kg (6.6 lbs), while the Probat P12 III is highly flexible and can handle micro-lots down to 1 kg (2.2 lbs) quite comfortably.
Do I need an afterburner for the Probat P12 III?
It depends on your local environmental and zoning regulations. If you are operating in a dense urban or suburban area, you will likely need to purchase and install a separate afterburner to control smoke and odor, whereas the Loring S15 has this capability built-in.

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