The Roaster Desk

By Kai Nakamura · Production roaster & equipment editor · Updated 2026-09-17

Mill City 10kg vs Diedrich IR-12

US-built value drum against the IR platform everyone knows

→ Diedrich IR-12

Diedrich IR-12 holds the service network — Mill City only wins on upfront capital.

Capital outlay: WinnerHourly throughput: WinnerAutomation depth: Close
Lowest street price → Mill City RoastersFaster batches → DiedrichIR radiant profile → Diedrich drum physics

Also searched: diedrich ir-12 vs mill city 10kg

Decision picker

Is this your first production roaster?
What is your parts-and-service radius?
Capital ceiling all-in?

Specification matrix

Batch capacity

Mill

10 kg

Diedrich

12 kg

Heat source

Mill

320,000 BTU/h gas

Diedrich

400,000 BTU/h gas

Drum / chamber

Mill

Carbon steel drum

Diedrich

Double-wall IR drum

Batch time (typical)

Mill

13 min

Diedrich

14 min

Throughput (modelled)

Mill

35.3 kg/h

Diedrich

40 kg/h

Street price band

Mill

$42,000 USD

Diedrich

$95,000 USD

Exhaust

Mill

750 CFM

Diedrich

900 CFM

Lead time

Mill

10 wks — confirm with dealer

Diedrich

16 wks — confirm with dealer

Automation

Mill

Optional Cropster/Artisan RT

Diedrich

IR control panel

Service hub

Mill

USA

Diedrich

USA
Airflow ctrlThermal stab.Drum speedAutomationCapex value
10kgIR-12

Qualitative scores — verify against your roast program

Why this split

Mill City undercuts Diedrich on equipment price by roughly $25k — Diedrich wins on dealer density and Cropster integration history.

Airflow path through a commercial drum roaster from burner to cyclone
Typical drum roaster airflow: burner → drum → cyclone chaff collector

Deep dives

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 Mill City 10kg 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

Mill City Roasters strengths & gaps

  • Value pricing
  • Fast US delivery
  • Manual operation default

Diedrich strengths & gaps

  • Infrared precision
  • Strong US service network
  • Higher gas consumption vs Loring

FAQ

Looking for diedrich ir-12 vs mill city 10kg?
Same comparison — Mill City 10kg is listed first by convention. Verdict and spec matrix are identical either way.
What throughput can I expect?
Modelled: 35.3 kg/h (Mill City 10kg) vs 40 kg/h (Diedrich IR-12) including a 4-minute charge/cool cycle.
What street price should I budget?
Mill City 10kg: $42,000 USD (As quoted Q1 2026, US factory). Diedrich IR-12: $95,000 USD (As quoted Q1 2026, ex-install). Request refreshed quotes — neither includes install.
Which supports Cropster logging?
Mill City 10kg: Yes with RT bridge — confirm with dealer. Diedrich IR-12: Yes with RT bridge — confirm with dealer.

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