• • CREATES $1014+/HOUR

Photo by HG Coffee in Apache Junction, AZ

6 Kilogram Coffee Roaster, MCR-6

$24,600.00 USD Sale Save

The MCR-6 Coffee Roaster, along with the MCR-10 and the MCR-15, sit right in the the middle of the MCR Series and brilliantly straddle the line between small batch and high production. The total control you have over your fuel, fan and drum speed allow you remarkable flexibility in your batch size. You can easily produce enough coffee to support a thriving brand on this roaster but you can also cut your batch size down dramatically to focus on a special green or small project.

The all-digital control system integrates seamlessly with RoastPATH®, including the highly requested Roast Replay feature. During the roast, RoatsPATH® automatically logs BT, ET, IT and DT temperature readings, as well as fuel setting changes, and fan, fuel and drum speed adjustments. Direct drum pressure is also logged as a feedback loop for operator controlled roast airflow changes.

This model includes the Operator Assist System which automatically recovers to production charge temperature settings, starts timers, and triggers the cooling tray fan and stirring arms off/on at discharge from the drum or cooling tray. This system also incorporates position sensors that make it nearly impossible to accidentally discharge green coffee from the drum into a cooling tray filled with roasted coffee.

High capacity cooling trays and stirring arms are designed to hold 3 full batches for post-roast blending. High performance cooling fans cool 2nd crack roasts within 4 minutes.

The MCR-6 is available in an NSF certified configuration.

  • Roaster body
  • Cooling tray & off-board cooling tray fan
  • Chaff collector
  • Advanced digital control panel with USB connection
  • Operator Assist Sensor Package
  • Thermocouples measuring BT, ET, IT, and DT
  • Digital drum pressure gauge
  • Safety cooling tray cover
  • Built-in drum gap adjustment mechanism
  • Pre-delivery support from our design team including space planning review, venting specification & project advice
  • Set-up call: 1-on-1 video call with our Support Team to review your installation before passing you on to a 1-on-1 video call with our Roastery Team to complete your first seasoning roast
  • Warranty

  • Choose from three optional layouts using our Quick-Connect kits to arrange components and exhuast -or- request a custom layout
  • Optional UL® NSF (National Food Safety) package.

Next available: 2 available in July/August - reserve today!

Build & quote Limited Time - 0% Financing Available*

Arrives in three crates
Roaster crate: 56” x 45” x 76”, 1200 pounds
Cooling tray crate: 34” x 36” x 54”, 365 pounds
Chaff collector crate: 30” x 30” x 69”, 233 pounds

Request a quote to see costs to your location.

This equipment is covered by Mill City Roasters' warranty.

Photo by Arvida Roasting Co in Jonquière, QC 



Roasting 4 full batches an hour on an MCR-6 creates over 42 pounds of roasted coffee every hour. This yield is enough roasted coffee to fill more than 56 12-ounce bags. With a retail value of $18 per 12-ounce bag, you can create $1014 of retail coffee per hour.

Want to see how your business expenses stack up against that income? Use our Roaster Income Calculator to use your real-life expenses and find a roaster capacity that works for your business plan.

Roaster Income Calculator


Automated Coffee Roasting

An entirely new approach to automation that keeps craft at the center of what you do. Available on all Digital Roasting System coffee roasters via a RoastPATH® software subscription.

Operator Assist Sensor Package

Standard on all roasters with our Digital Roasting System, the Operator Assist features are designed to lower the cognitive load of the operator. Once you have it, you'll never want to be without it.

Advanced Data Logging

Data is key to a modern coffee roasting practice. Knowing what happening inside your drum is at the heart of your internal QC program but also serves to help troubleshoot maintenance issues, evaluate workflow, and better understand your roasting process.

Precision Variable Control

Mill City Roasters was the first in the industry to offer as a standard feature variable fuel, fan, and drum control (we couldn't believe it either) but we've taken it a step further by refining that control for the operator.

Rapid Return Between Batch Protocol

Consistency in your roasting can only be achieved with stability in your roasting machinery. Automatic between batch protocol is standard on all MCR coffee roasters from the MCR-1 and up.


Certified machinery is more easily insurable, installable and our coffee roasters are backed by an experienced team to help advocate on your behalf with installers, contractors and permitting officials.


  • Monolithic, low carbon steel weldment – the heaviest constructed roasters in their class.
  • Fully gusseted for dimensional strength and stability.
  • Fully coated to prevent corrosion.
  • Integrated double-walled roast compartment is heavily insulated which further converts the chassis into a thermal battery – storing heat, rather than wasting it.
  • Materials in both the chassis and the roast compartment absorb heat more efficiently and release heat more consistently for increased stability of temperatures during profiling.
  • Trapping heat = trapping noise. Ambient drum noise is limited to a whisper quiet 60 decibels making it easier to hear those early outliers before first crack.


  • Double-wall, stainless steel drums standard on every model. The heaviest, most-efficient drum design in the industry.
  • Construction accuracy is machine trued to within +/- .025”.
  • 3mm air gap between inner and outer drum diffuses heat more evenly throughout inner drum.
  • Diffused heat at inner wall eliminates conductive roast defect, even at higher inlet temperatures.
  • Dramatically increased thermal efficiency by storing & using heat, rather than quickly releasing.
  • “Bomb proof” construction prevents warping due to operator error.
  • Every model equipped with quick response, variable drum speed allowing the operator to achieve ideal bean loft and conductive vs. convective ratio. Result is the flexibility to profile batches from 20%-120% of listed drum capacity on most models.
  • Advanced drum gap adjustment mechanism is standard on all models two kilogram capacity or greater, making adjustments easier and more precise.


  • Custom-designed, CSA® Design Certified low loss gas train designed by Mill City Roasters and used exclusively in our roaster line-up.
  • Custom burners designed specifically for coffee roasting.
  • Burner layout is specific to each model to achieve optimal burner-to-drum relationship.
  • Easy access, external shut-off valves on every roaster.
  • Built-in temperature limiters to allow for safe operation.
  • Built-in safety shut-off on pilot valve.
  • Easy on-site conversion from LP to natural gas.
  • Digital electronic modulating valve offering greater control for your most challenging profiles in variable batch sizes.
  • Fuel adjustments at the push of a button.

Air & Exhaust

  • Power-vented dual exhaust system standard on every model with fan placement designed to allow for easy cleaning and maintenance.
  • Roaster exhaust fan is high pressure, high output 3-phase VFD speed controlled with linear response curve for more predictable and more precise airflow control and roast profiles repeatability.
  • Cooling tray exhaust fan is a dedicated, high-pressure fan providing rapid cooling to stop roast progression once batch is dropped in cooling tray. Dual exhaust system allow for simultaneous roasting and cooling, reducing back-to-back batch times and increasing production to 4+ batches per hour.
  • All machines include face-mounted digital drum pressure gauge.
  • All models equipped with dedicated, off-board chaff filtering collectors with easy access doors to aid in frequent clearing of chaff and completion of safety checks.
  • Optional quick-release venting kits available for every model.
  • Fully specified requirements for venting to termination including layout and cap recommendations.
  • Fan adjustments at the push of a button.


  • CSA® Design Certified CSA 1.8 for US and Canada, IEC, CE, ROHS.
  • CSA/UL certified Honeywell automatic ignition controller
  • All UL/CSA certified Delta PLCs and VFDs.
  • CSA/UL certified motors, relays, switches, and wiring.
  • Optional UL® NSF Certification available on every model.
  • Entire contact path of roaster (hopper, loading chute, faceplate, trier, drum, discharge gate, discharge chute, cooling tray cover, cooling tray floor, stirring/mixing arms, cooling tray gate, cooling tray latch, cooling tray gate) all custom fabricated with certified food grade stainless.
  • Teflon cooling tray wipers.
  • Heavy duty 5mm x 44mm Borosilicate sight glass.
  • Food service safe LED light.
  • Food safe resin-impregnated trier handle.
  • Stirring arms automatically stop when the cooling tray cover is opened.

Install & Maintain

  • Designed with off-board cooling fans and stand-alone chaff collectors to allow for easier moving, better access and easier maintenance. Off-board components can offer more flexible layouts for users with space limitations.
  • Detachable control panels for moving components through standard size door openings. Removable hoppers on all models.
  • Adjustable leg heights on components.
  • Quick-Connect Kits available to quickly connect components.
  • Roaster body features large, full swing, removable access doors on both sides for easy access to interior components.
  • Cooling tray features large, full swing, removable access doors on both sides for easier cleaning.
  • Warranty

Planning & Installation

Layout A

Base layout with roaster connected to chaff collector via removeable section and cooling tray connected to cooling tray fan via a short disconnect. Additional disconnects for chaff collector and cooling tray fan exhaust ports available. This layout requires owner to install two exhaust lines to termination. 

Assembled size
(w x d)
4’-9” x 7’-10”
(1.44m x 2.38m)
Space required
(w x d)
9’-3” x 12’-5”
(2.81m x 3.78m)
Additional costYes

Learn more >

Layout S (Separate exhaust lines)

Layout arranges dual exhausts into to two parallel connection points near back of roaster. Ideal for spaces with thru-wall terminations. This layout requires owner to install two exhaust lines to termination.

Assembled size
(w x d)
4’-6” x 7’-10”
(1.37m x 2.38m)
Space required
(w x d)
9’-0” x 12’-5”
(2.74m x 3.78m)
Additional costYes

Learn more >

Layout G (Ganged exhaust lines)

Layout gangs dual exhausts into to one connection point above the chaff collector. Only usable in spaces with straight up, thru-roof terminations. This layout allows owner to install one exhaust line to termination.

Assembled size
(w x d)
4’-6” x 7’-10”
(1.37m x 2.38m)
Space required
(w x d)
9’-0” x 12’-5”
(2.74m x 3.78m)
Additional costYes

Learn more >


Operates on LP gas or natural gas. Requires commercial gas pressure via 1/2" NPT connection. See installation manual for detailed pressure requirements.

Burners arrive configured for LP gas but can be converted for natural gas using our easy, on-site conversion kit.

We can also help sourcing the correct gas regulator for your installation and talk your installer through any questions they have regarding gas pressure.


Requires a dedicated single phase circuit, 220-230V, 20A, 50-60Hz.

Unit arrives with an industrial gauge unterminated power cord measuring 10 feet (3 meters) that can be hardwired into a junction box or installed using a locking plug/receptacle per your local code.


Requires dedicated Category III, Positive Pressure exhaust line(s) to carry exhaust from roaster drum & cooling tray to termination outdoors.

See installation manual for maximum runs, minimum heat ratings and clearance-to-combustible requirements. Our Design Team offers free consult to help you make a plan for your building.

Take a closer look

From our video library

Install an MCR-6 with us

Watch our team uncrate an install an MCR-6 in our in-house roastery in Minneapolis

Customer Reviews

Based on 2 reviews
Trey Brooks

This is more a review of the company than the 6 kg machine we bought but nothing but great things to say about the Mill City Roasters Team! My wife and I decided to finally purchase a production roaster for our coffee shops a few months back and the number one thing Mill City provides when you purchase from them is confidence. Confidence before you buy by taking Roasting Classes on site at Mill City Roasters. Lauren and Bryant, y'all are amazing and cannot thank you enough for the classes we took with you both! Confidence that when you have a question someone will actually pick up the phone and help. Twice I got the owner Steve who picked up my call and answered all my questions. I couldn't believe it as all the other companies I called while researching roasters was a "leave a message and we'll call you back" response. Not here. Someone picks up the phone and if they cannot help they will find you someone who can. After we decided to buy just watching their videos online on how to "un-pack" your crates when they arrive was so helpful. I literally just followed it step by step. Thank you for making that video btw. Actually their videos are the best out there too. All of them on youtube are worth watching. So thank you Mill City Roasters! Angie, Aziz, Nic, Lauren, Bryant, Steve and everyone I am forgetting who has and continues to help my wife and I grow our business, thank you. Y'all are the best!

Mark Janzen

We bought this roaster, but we unfortunately never got a chance to use it. So, this is going to be a review of Mill City Roasters in general rather than a review of this machine's performance. That said, we looked at a lot of machines in this size class before deciding on this one and I can tell you the deciding factor was the PEOPLE at Mill City. There are dozens of machines that can effectively apply heat to beans and turn them brown and I have no doubt that after learning any particular machine, a skilled operator will produce outstanding coffee. The difference with Mill City is going to be found in their support and willingness to go above and beyond any expectations. The internet is full of stories about all builders, but the one constant seems to be the near universal praise for the character of the people at Mill City. Their commitment to education, to other's successes, and service to the specialty coffee industry is rarely matched. Not to mention their roasters are also nearly universally praised by many very well respected roasters. That's why we landed here.

This brings me to the fact that we never got to use our roaster. We purchased last year, and then ran into delay after delay, which combined with some personal challenges, we were forced to make the decision to abandon our plans for the roastery. Our brand new roaster sat there partially uncrated and unused. Steve Green helped and supported us the whole way in our efforts to sell the machine - he created a blog post to promote our listing, fed our name to potential buyers, and the eventual purchaser was pointed to us by Steve. Without his help we certainly wouldn't have been able to move the roaster before our lease was up, or recoup a reasonable amount of our investment. I know everyone will work to take care of the new owner of our machine and I look forward to tasting the coffee they produce with it in the near future. - Mark, El Cap Coffee Co.


Request a quote to get freight costs to have your equipment delivered to your location.

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