By Kai Nakamura · Production roaster & equipment editor · Updated 2026-09-17
Loring S15 Kestrel vs Diedrich IR-12
Recirculation gas efficiency vs IR drum familiarity
Loring wins on gas bill and emissions — but only if your permit timeline survives a 28-week lead.
Also searched: diedrich ir-12 vs loring s15 kestrel
Decision picker
Specification matrix
| Spec | Loring S15 Kestrel | Diedrich IR-12 |
|---|---|---|
| Batch capacity | 15 kg | 12 kg |
| Heat source | 350,000 BTU/h gas | 400,000 BTU/h gas |
| Drum / chamber | Single-wall steel | Double-wall IR drum |
| Batch time (typical) | 12 min | 14 min |
| Throughput (modelled) | 56.3 kg/h | 40 kg/h |
| Street price band | $185,000 USD | $95,000 USD |
| Exhaust | 800 CFM | 900 CFM |
| Lead time | 28 wks — confirm with dealer | 16 wks — confirm with dealer |
| Automation | Smart Roast PLC | IR control panel |
| Service hub | USA | USA |
Batch capacity
Loring
15 kgDiedrich
12 kgHeat source
Loring
350,000 BTU/h gasDiedrich
400,000 BTU/h gasDrum / chamber
Loring
Single-wall steelDiedrich
Double-wall IR drumBatch time (typical)
Loring
12 minDiedrich
14 minThroughput (modelled)
Loring
56.3 kg/hDiedrich
40 kg/hStreet price band
Loring
$185,000 USDDiedrich
$95,000 USDExhaust
Loring
800 CFMDiedrich
900 CFMLead time
Loring
28 wks — confirm with dealerDiedrich
16 wks — confirm with dealerAutomation
Loring
Smart Roast PLCDiedrich
IR control panelService hub
Loring
USADiedrich
USAQualitative scores — verify against your roast program
Why this split
Loring recirculation cuts exhaust heat — Diedrich IR drum is the platform your tech already knows how to fix.
The split is capex vs operating cost, not cup quality. Both hit production specs when sized correctly.
Deep dives
Recirculation vs open exhaust
Loring S15 Kestrel recirculates hot gas — exhaust temperature drops and afterburner load shrinks.
Open-drum platforms vent more heat per batch. Model your gas meter at 50% and 75% charge before signing.
Verify with vendor
- • Request OEM combustion efficiency curve
- • Confirm AHJ afterburner requirement for your address
IR radiant heat transfer
Diedrich IR drums radiate through a double-wall — different first-crack timing than convection.
Operators switching from Probat or Giesen need 15–20 calibration batches, not a copied profile.
- Log development time ratio across 3 charge weights
- Compare ground colour at same end temp
What to verify with your dealer
Neither OEM publishes binding street prices — quotes move with queue and freight.
Verify with vendor
- • Confirm Loring S15 Kestrel lead time and freight to your dock
- • Confirm Diedrich IR-12 install kit and probe package included
- • Ask for three references at similar elevation and batch size
Side-by-side
Loring strengths & gaps
- Low NOx afterburner standard
- 35% gas savings vs conventional
- Premium price
Diedrich strengths & gaps
- Infrared precision
- Strong US service network
- Higher gas consumption vs Loring