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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

Get it in Ashburn by Thu May 24.
Maelstrom® Stir Plate

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  • Maelstrom® Stir Plate
  • 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
4.4 / 5.0
107 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Stars
This stir plate is great!
This stir plate made the prep for brew day much easier. I could set the time I wanted the plate to stir for so that the yeast would settle out in time to be pitched. It seems durable and it definitely had more than enough power to create a serious whirlpool in my 1.5L starter on level 2 out of 5. It looks like it created a lot more yeast than my previous method of swirling the flask hourly. I highly recommend!
May 10, 2018
4 weeks ago
Very good stir plate
Very pleased with this stir plate. Good construction, programmable time and speed.
April 9, 2018
7 months ago
Maelstrom stir plate
I bought a Vortex stir plate some time ago and it worked well for a small starter, one or two liter flask maximum. The Vortex would not stir a five liter flask with a two liter starter. So uI was hesitant to buy anorther stir plate even though it was advertised to stir up too a five gallon, but I went for it and it works great. Not sure it will really do a five gallon starter but my five liter flask full, stirs with no problem.
March 22, 2018
3 months ago
Anyone else have an issue with the 50 mm stir bar
Was super excited to use this stir plate especially for the money it costs. Got it to the house and tried it with the 50 mm stir bar they had sent with it and it wouldn't turn. The motor would basically only click back and forth and never start spinning at any speed. This was with a 5L flask on it and I tried it at all speeds. I left it on at the highest speed and it still wouldn't start. Luckily I had a spare 25 mm stir bar which obviously has less magnetic force and it allowed for the motor to start and turn.

Anyone else have any issues with the 50mm bar that NB is sending with these? Wondering if I have a weak motor for the stir plate. I would assume if NB is sending the 50mm stir bar that it should work with the Maelstrom stir plate.
March 13, 2018
3 months ago
Save your money
Shortly after buying this stir plate, it started acting funny durring start up. Now, I have to put alot of effort into making it spin at all and the timer stopped working too. I even tried different power cords to make sure that wasn't the issue. Also, it seems that the speed control is not working right. I would save my money and buy a better one if I had to do it again.
February 21, 2018
I’ve used it for two starters so far and it’s awesome! Strong magnet and great funnel. I’ve done a 4 liter starter with a strong funnel going.
January 25, 2018
4 months ago
I love this product. It has definitely helped improve my beers. Worth the investment!
January 25, 2018
4 months ago
Works great on 2000ml & gallon jugs, would be 5 stars if program time went beyond 48 hrs.
January 15, 2018
5 months ago
Consistent speed and quiet running
I purchased this to replace a homemade one that would no longer keep constant speed.
This ran a consistent speed and is quiet running. The digital controls are a nice plus and makes for easy clean up should there be any splashes. My only issue is that the magnets are so close to the base that they sometimes freeze the stir bar. Placing a piece of the rubberized, non-slip drawer liner material on the surface gave just the right amount of additional space needed.
January 4, 2018
5 months ago
Love it
Love it. Powerful and quiet. Definitely a splurge but sick of fiddling with my DIY
November 20, 2017
7 months ago
Start typing your question and we'll check if it was already asked and answered. Learn More
Browse 19 questions Browse 19 questions and 52 answers
Do the glass big mouth bubblers work with this? I'm looking at this for yeast propagation at a brewery.
A shopper on Feb 9, 2017
BEST ANSWER: Yes it will work on the old style glass big mouth since the bottom is flat but will not work on the plastic big mouth due to the concave bottom. I'm not sure if the new style big mouths are flat or concave. For my home brew club, I was successfully able to propagate yeast for a 72 gallon pitch using this stir plate and a 6 gallon carboy. Make sure you buy at least a 2" stir bar. The short stir bar that comes with the stir plate is too short for a carboy.
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.
Is the stir bar that is included resistant to boiling temperatures? ie can I boil the stir bar in the starter flask to sanitize/sterilize it?
A shopper on Mar 21, 2017
BEST ANSWER: This is what I do:
I measure 100 grams of Dry Malt Extract, 1/2t of yeast nutrient in a 2 liter Erlenmeyer flask, then fill it with RO water to the 1L mark. I drop in the stir bar, and stir for an hour. At the end of an hour, I put the flask on the stove. At the same time, I take my yeast out of the fridge (in a i Liter Erlen flask), and start the yeast warming up, on the stirrer. I always leave the stir bar in the fridge flask. When the one on the stove boils, I cover it with foil, and let it cool down. When the one on the stirrer and the one on the stove are both room temp, I mix them together, and spin overnight. When I am ready to pitch, I pour half in the fermenter, and half back into the small fridge flask. I do that forever. The big flask gets cleaned and sanitized, and the stir bar goes on the fridge door. After about 6 or 8 times, it starts to lose power, and slides down the door, but they work fine in the Maelstrom. The fridge door also has a tough time with all magnets, so I just make sure to have a big magnet below the stir bars.
Are there Replacement Magnets available? I've lost mine in a move and need to get brewing again!
A shopper on Dec 5, 2016
BEST ANSWER: If you mean the stir bar http://www.northernbrewer.com/standard-stir-bar
Can i set a 5gal glass carboy filled with wort on this unit to provide aeration before adding yeast. if yes will the small magnet work?.
daniel h on Jan 1, 2018
BEST ANSWER: I have conducted the entire primary fermentation of mead in 6.5 gallon Big Mouth Bubblers (glass) on a Maelstrom stir plate several times. The stir plate easily handled the weight. I don't know what size "the small magnet" is. I'm going to assume you mean the 50 mm stir bar that's included. That stir bar was able to keep my yeast in suspension, but didn't pull a deep vortex. I typically use a 75 mm stir bar anyway, so I can run the stir plate at a lower speed. (Since it's running for weeks.) The size of the stir bar necessary will depend on thickness and the "chunkiness" of your wort. For example, if you have a lot of hot/cold break, or residual hops material, then you'll likely need a larger stir bar.
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
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.
I own a malestrom and it is great with 4 liter starters. I would like to do 6 gallon (22 liter) starter in plastic bucket or plastic fermenter with a flat bottom. Can you tell me the weight limit for the plate?
A shopper on Jun 24, 2017
BEST ANSWER: We do not know a weight limit for the plate, but we have on occasion filled a 6.5 gallon glass Big Mouth Bubbler with water and it has worked just fine. I would caution you about using plastic buckets or fermenters with the Malestrom, as any dimples in the plastic will inhibit the action of the stir plate.
Can this handle a 10-gal starter (yes, 10 gals of wort) in a keg as a fermenter?
A shopper on Apr 17, 2017
BEST ANSWER: Thanks for contacting Northern Brewer. I understand you want to make a 10 gallon starter, but the Maelstrom can handle up to a 5 gallon starter. If you were making starters larger than 5 gallons I could not guarantee this product would work for it. Cheers!
Does this come with a catch magnet to keep the stir bar from pouring out?
Mike H on Aug 30, 2015

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