• • CREATES $506+/HOUR

Photo by Bedrock Coffee Roasters in Neenah, WI

3 Kilogram Coffee Roaster, MCR-3

$16,000.00 USD Sale Save

The MCR-3 is a solid production system for small roasteries worldwide. Featuring the same monolithic weldment plate steel chassis and drum construction as our largest production roasters, this 3 kilogram capacity roaster is a great solution for the aspiring professional coffee roaster that is interested in the lower price-point of a manually controlled roaster.

This model is RoastPATH® connectable with an integrated USB port that passes BT, ET, and DT thermocouple readings along with input changes in fan speed and resultant digital drum pressure. The roaster is equipped with variable drum speed for optimal roasting from batch sizes from 600 to 3600+ grams. Control on this machine is via hand adjustments of the gas input and power input for the fan and drum speed.

The MCR-3 features a thermally isolated cooling tray and high output cooling tray fan that cools coffee from 2nd crack in as little as 4 minutes.

The MCR-3 is available in an NSF certified configuration. If you're interested in this capacity roaster but with our Digital Roasting System, check out the MCR-3D.

  • Roaster body with integrated cooling tray
  • Chaff collector
  • Thermocouples measuring BT, ET, 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: 1 in-stock in Minneapolis!

Build & quote Limited Time - 0% Financing Available*

Arrives in two crates
Roaster crate: 70” X 42” X 74″, 1099 pounds
Chaff collector crate: 26” X 26” X 69”, 195 pounds

Request a quote to see costs to your location.

This equipment is covered by Mill City Roasters' warranty.

Photo by Bedrock Coffee Roasters in Neenah, WI



Roasting 4 full batches an hour on an MCR-3 creates over 21 pounds of roasted coffee every hour. This yield is enough roasted coffee to fill more than 28 12-ounce bags. With a retail value of $18 per 12-ounce bag, you can create $507 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


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.
  • High precision CV needle valves.
  • Precision analog gas gauge.

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.


  • 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 stand-alone chaff collector to allow for easier moving, better access and easier maintenance. Separate 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.
  • Lockable, smooth-action casters on roaster.
  • Adjustable leg heights on chaff collector.
  • 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 for easier cleaning.
  • Warranty

Planning & Installation

Layout A

Base layout with roaster connected to chaff collector and cooling tray connected to cooling tray fan via a removeable section. 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)
2'-10” x 7'-4”
(0.88m x 2.24m)
Space required
(w x d)
7'-4” x 11'-10”
(2.24m x 3.61m)
Additional costNo

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)
2'-10” x 7'-4”
(0.88m x 2.24m)
Space required
(w x d)
7'-4” x 11'-10”
(2.24m x 3.61m)
Additional costNo

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)
2'-10” x 7'-4”
(0.88m x 2.24m)
Space required
(w x d)
7'-4” x 11'-10”
(2.24m x 3.61m)
Additional costNo

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, 15A, 50-60Hz.

Unit arrives with a power cord measuring 3 feet (1 meters) terminated with a NEMA 6-15 plug.


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

Customer Reviews

Based on 4 reviews
Justin Hilligoss

This was my first commercial roaster that I bought and I love it. I did a lot of research when trying to decide what roaster to buy and I am so glad I found Mill City. The roaster is a solid built machine and has been built by people who actually roast coffee and it shows.
The best thing about Mill City Roasters is the customer service. I would encourage anyone who is wondering if they should make the "jump" to call MCR and ask them any questions you might have. I decided to take the beginners roasting class at their facility and I could tell right away that the Mill City crew genuinely wanted to help me succeed, it was a great feeling.

So far I have not observed anything on the machine that I would consider a con. It is a pretty straight forward machine. I would suggest that you plan ahead if you our planning to purchase one because the delivery lead time can be awhile but I think that is expected with any major equipment purchases.

Overall I love it and I can't wait to start making some coffee


This roaster is awesome! I graduated from a home roasting setup to this bad boy and have LOVED it. I got bit by the bug and since buying this thing have attended several training event at different places around the country and am in the process of getting my roaster level 1 certificate through the SCAA/Roasters Guild. As a result of that I have had the pleasure of getting to play on a lot of different small to medium sized machines. I haven't met any roaster around this capacity that I think I would enjoy more than the North. When I talked with Dave before my purchase he assured me that these roasters are overbuilt. I wholeheartedly agree. This thing has so much residual heat once it get warmed up that it took a lot of getting used to. I had to put A LOT of green though this machine at full capacity to even begin to feel comfortable with the machine itself let alone scaling it down to lower capacity charges. I can now very comfortably roast at 50% capacity on this guy but because of how well it is built, that is as small as you are going to get a batch to with consistent results. The roaster is very versatile and allows you to control every variable so well. I have enjoyed it so much that I have a North 500g Sample roaster headed my way shortly to do profiling on. The North machines are hands down the best bang for the buck out there! Not to mention the fact that the whole crew at Mill City are as good as they come. I got to know them pretty well through phone calls and emails wait on my roaster to arrive. I also had the privilege of going to scope out their facility and meet the crew when I was in Minneapolis for a training. These people are top notch and take VERY good care of their customers. Tune into the Coffee of The Month streams. You will learn a ton. Thanks Mill City!


I also agree with Ryan in his review below about the height of the roaster. My solution was the below 12 quart container. Food grade plastic and a perfect fit.
Having the roaster on heavy duty casters is worth the strange height in my book. The thing weighs about 700lbs.

Ryan Patenaude

This roaster is so solid and beautiful. Everyone who visits wants to spend time admiring the roaster. The photos on the site are slightly outdated, but rest assured that any modifications that have been made since these photos were taken are upgrades and improvements. This is one solid piece of equipment, over built in every way.

What I found most unbelievable about my purchase was the thoughtfulness of Mill City when it comes to what is provided with the roaster. I was sure I would have to visit the hardware store before being able to roast my first batch--but I was mistaken. They thought of everything--from a gas leak finding solution to 4" hose clamps.

I would offer one criticism of the 3KG floor model and that is the slightly awkward height. You would think that sitting while roasting would be nice, but I don't love it. Also, the chute coming off the cooling tray is only 8" off the ground and I had to buy special containers big enough to receive 5-6 lbs of coffee and short enough to fit under the chute. Other than this minor inconvenience, this thing is as close to perfect as I could ask for.

Customer Service is top notch.


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

CALL (612) 886-2089

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Reach out to us via our contact page and we'll get back to you asap.