Maelstrom® Stir Plate


SKU# 40332

Flat Rate Shipping only $7.99 only from Northern Brewer

The first industrial-grade programmable stir plate designed specifically for yeast starters.

Breed a Herculean army of yeast for brewing bigger beers than ever before. Powerful rare earth magnets churn through any size starter and never throw a stir bar. Five-speed control adapts to sizes from minute to mammoth, for starters in a 1000ml erlenmeyer flask, all the way up to a 5-gallon carboy.

Command a massive starter while you’re at work or over the weekend. Let it run indefinitely or program up to 48 hours of stir time. Schedule it to settle out yeast just in time to come home and brew.

Watch Maelstrom® surge through starter wort. The transparent body shows the magnets whipping through rotation. Plus, the seamless surface makes for easy cleaning.

Easy to use with an intuitive interface, the Maelstrom® sets the new standard as the most powerful and versatile homebrewing stir plate ever created.

*Erlenmeyer Flask not included


Availability: In stock

Maelstrom® Stir Plate

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  • Maelstrom® Stir Plate
  • Maelstrom® Stir Plate
Product Details


  • Now includes a 50mm stir bar!
  • Five distinct speeds, from 480-1440 RPM, to accommodate yeast starters up to 5 gallons
  • Scheduling function for up to 48 hours
  • Seamless surface for easy cleaning & maintenance
  • Powerful magnets will never throw a stir bar
  • Translucent body lets you watch the magnets in rotation
  • Standard 12V Power Adapter
  • Large 8” W  x 8 ½” L stirring platform

*Erlenmeyer Flask not included

Be sure to check out the Fermenter's Favorites® Yeast Starter Kit in 1000 ml and 2000 ml sizes.

Additional Information
Support Documents:Maelstrom® Stir Plate
4.3 / 5.0
70 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Tired of Messing Around with DIY Stirplates? This thing is AWESOME!
I've built several DIY stirplates over the years. I've had reasonable success with them - some were better than others. I thought I was satisifed. My most recent stir plate went tits-up, and I broke my 2000ml flask . For years I've been battling with my stir bars - sliding the flask back and forth to get a good lock, only to have it kicked off in the middle of the night when the starter got too thick, particularly with high-floc strains. Anyway - I've had success, but had a definitely love-hate relationship with my stir plates.I finally broke down and selected the Maelstrom - HOLY SHITE! Honestly, I had no idea what I was missing! This thing is incredible. I can get a nearly two-inch wide vortex in a 2L starter with ZERO signs of losing the bar. I don't subject my yeast to that kind of punishment, but if they get out of line...The pause button, the way it ramps-up the speed, the timer - they really have thought of everything - at least everything I need. Provided this thing holds up to a few hundred batches minimum, I think it was well worth the money. It is pricey, no doubt!Anyway, the entire time between ordering and receipt I felt like a douche. Really? On a stir plate? C'mon man. The moment I plugged it in and ramped it up, I was immediately glad I'd come off the cash for a purpose-built stir plate. Thanks NBNOTE - I purchased this in the yeast health kit w/ the Oxy2.0, new flask, etc so I will not show up as a verified buyer..
August 28, 2016
Response from Northern Brewer
Thanks for the great review! We are so glad you're enjoying the new tool! -Mike W, Northern Brewer
November 21, 2016
Northern Brewer N
it's good
I like it. It stirs.
August 18, 2016
Great stir plate.
This thing is a monster. It has held a steady vortex In the thickest sludge of yeast I've ever seen.
September 30, 2015
Great investment
Strong, well-made stir plate. Much better than my DIY plate that wasn't adjustible
September 30, 2015
Works great
Simple, no longer have to shake my yeast starter by hand! It was def worth it!
January 20, 2016
Great and recommended
This is a great stir plate. Easy to use, super strong magnets, runs my 5L flask starters great. It's big but it's worth it for people who do big starters for 10+ gallon batches.
February 10, 2016
Good stir plate
After trying unsucessfully to make my own stir plate, I purchased the maelstrom. It's lighter than a lab-grade stirplate, but runs well and quietly. I have used it for a small starter (200ml) and had great yeast growth. I look forward to trying larger starters. It comfortably holds my 2L flask.
May 16, 2016
Spend the extra 30 dollars.
This thing is amazing. Made my first starter last night and checked it this morning and had a wonderful milky color of wort twirling around in the flask. Programmable to end when you want if you want to decant. This thing does not throw the stir bar and hums nice and quite when set at the right speed.
May 11, 2015
Powerfull & Relaible
First day of use: Solid funnel all the way down to the bottom. Nice aeration with No bar chatter. Spun a 2 liter starter like a blender. Even after the bar was buried in sediment. So nice to check it in the morning and find it still spinning.
December 19, 2014
Huge upgrade
Heretofore I've been using the diy/computer fan stir plate. Was thinking about upgrading. Emailed NB and asked about this plate and the big mouth bubbler expansion kit. This combo works like a charm. Enough volume to do a 4l starter and only $20. I still use my 2000ml flask for most starters but this combo gives a huge pitch for lagers and big ales. Couldn't be happier.
April 17, 2015
Start typing your question and we'll check if it was already asked and answered. Learn More
Browse 13 questions Browse 13 questions and 32 answers
Is this unit based on a computer fan assembly?
P R on Dec 12, 2015
BEST ANSWER: Yes, and No, the unit is similar in design, however I've not seen a CPU fan with that torque, using magnets of that size at my local CPU supply store. The Malestrom spins a great 4l slurry in a 5L flask with just a one inch stir bar. That being said, speed and timer options along with a fairly stout polymer base make it a sound purchase. It's Fairly quiet and sleek. I myself prefer to craft beer not stir plates. Lastly if it fails to function, Northern Brewer will resolve my issues, keeping my business, instead of a couple of Box stores. Happy Yeast make GREAT BEER!
Is it correctly understood that this unit comes with a 120V AC/12V DC standard power adapter, which I can just change to a 230V AC/12V DC adapter myself, in order to use the unit in a country with 230V mains?
A H on Aug 2, 2016
BEST ANSWER: Yes, it has a US-style two prong plug on the transformer. The transformer accepts 120-240VAC (50-60Hz) and outputs 12VDC. A standard plug adapter (for example, two-prong US to UK) is all you should need.
Just opened it. Made my started, dropped in the magnet, turned on the plate... nothing happening. Am I missing something? I have set both the speed and time and it is not in the "pause" setting.
J L on Jul 24, 2016
BEST ANSWER: Customer service will contact you to try and troubleshoot or exchange for one that works without issue. It should be as simple as turn on, set time and speed, but you may need to hit the pause button to 'unpause' it if it was paused when started.
This isn't really a question but more of an experience I had with my plate.... The magnets were in pole to pole instead of opposites like it should have been... Had to flip one to make it work properly... the bar kept banging all around. Just wanted to share this didn't know where to do it... here looked good.
Gene R. on Mar 18, 2016
BEST ANSWER: That will happen with any stir plate to be honest. You have to move your flask or vessel around to find the sweet spot where the magnet makes the least noise
How long should you stir your starter yeast before you let it settle?
Mike H on Dec 10, 2015
BEST ANSWER: 12 hours
My routine is to start after work the day before brew day and I stir until I add everything the next afternoon which is between 9 to 12 hours.
I can see that this can do large volumes of liquid, but can also do small volumes such as 25 to 30ml, for doing total acidity testing in wine making with my Vinmetrica SC 300?
John C. on Nov 2, 2015
BEST ANSWER: I'm unfamiliar with the specific testing for the SC 300. That being said, I reviewed a few Youtube videos for the equipment and my guess for the limitations would be 1) length of the stir bar relative to the diameter of the test vessel, 2) if the vessel is light it might get spun with the stir bar, 3) the tip of the measuring instrument may hit the stir bar if the diameter of the vessel is too small and 4) the stirring speed on the Maelstrom is not infinitely adjustable (has specific speed settings) and the lowest setting may still be excessive for small volumes and would cause the liquid to splash out of the test vessel.

Hope that helps a little...good luck!
Finally got the unit and it won't power up. I took the cover off to see if there was something loose or anything like that, and it doesn't appear so. Circuit board doesn't have any noticeable defects, wires are making good contact. there's nothing that jumps out as faulty. Is there an FAQ page for this thing, or a manual more than the 1-sheet? I think i might have to return it, but would want to try to fix it if possible. Thanks in advance for the help.
J O on Aug 26, 2016
BEST ANSWER: Northern Brewer stands by their gear. My stir plate worked right out of the box. I would return it and get it exchanged. With the new white labs perfect pitch yeasts, my starters are just going nuts on the stir plate!! I'm pitching monster starters in less than 24 hours. It's a win win!!!
Can someone from Northern Brewer Verify is this will do 220V? I downloaded the tech speck from midwest supplies and it say 120V input, but that may be the device not the transformer. Also another buyer mention it had a capable transformer, but need to make sure before I buy this and take it half way across the world.
A R on May 24, 2016
BEST ANSWER: I run it on 110 vac in the US & it works fine. On 220v I would use an adapter or you may risk frying it on the first batch
I've had my Maelstrom for about a year and it ceased to function yesterday while spinning up a starter. Can't get it to start spinning again and the magnet bar appears to be tilted. Don't k ow how it happened as I wasn't around while it was running. What is the warranty period?
J O on Apr 24, 2016
BEST ANSWER: Hello John,

Thank you for choosing Northern Brewer! Was that stir plate purchased in store, or online? I am not finding a purchase for a Maelstrom under your account. We warranty our products for 1 year, but there is some flexibility depending on the situation at hand. If this was purchased in store, it will need to be taken up at the store. Here are the store direct lines Milwaukee 414-935-4097 Minneapolis 612-843-4442 St. Paul 651-289-4772. If it was purchased online, I can do a little more digging to see what I can come up with. Let me know, and we will get this figured out!
Who manufactures this ? and is it available in a 220V ?
A R on Apr 24, 2016
BEST ANSWER: My documentation does not indicate the exact manufacturer nor the place of origin. Maelstrom is the trade marked name, though. Includes a two-prong US-style power transformer (wall-wart) that accepts 100-240V, 50/60 Hz.
Cant seem to keep this quite. Magnet keeps banging around.
J I on Dec 18, 2015
BEST ANSWER: Should sound like a gentle hum. If it's on a hard surface, the sound will be amplified so try putting a towel or something underneath to dampen the noise. If it's making sounds beyond a hum, it may have been damaged. You should be able to look in there while it's spinning and may be able to notice any foul play.
That all being said, it's certainly not silent and you may be able to hear it humming along in a room even with the door closed. I'm assuming that mine is operating correctly and I've just moved it downstairs or in a more discrete location if the wife complains...Good luck.
Would this work for 230V (europe)
P K on Nov 19, 2015
BEST ANSWER: The Maelstrom is only compatible with standard U.S. 110 volt power sources.
Does this come with a catch magnet to keep the stir bar from pouring out?
Mike H on Aug 30, 2015
BEST ANSWER: It does not. You could really use any magnet to accomplish that though. Otherwise, carefully pouring it will usually work. It can help to have an extra stir bar on hand though, in case one goes into the fermenter.

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