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Fermentation Kit with ThermoStar® Digital Temperature Controller


SKU# BK005

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In one fell swoop, you can control the most important variable in making great beer--temperature. Wrap your brew in the warmth of the FermoTemp™ electric fermentation heater. Dial-in the exact temperature you need with the ThermoStar® Temperature Controller. It’s that simple.


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Fermentation Kit with ThermoStar® Digital Temperature Controller

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  • Fermentation Kit with ThermoStar® Digital Temperature Controller
Product Details

In one fell swoop, you can control the most important variable in making great beer--temperature. Wrap your brew in the warmth of the FermoTemp™ electric fermentation heater. Dial-in the exact temperature you need with the ThermoStar® Temperature Controller. It’s that simple.

Control fermentation with razor-sharp precision, monitoring the actual temperature of your liquid with the Thermostar® 12” Probe. Just set the ThermoStar® to the ideal range for your yeast, and let it do the work of making better beer for you!

Kit includes:
- ThermoStar® Digital Temperature Controller
- ThermoStar® 12” Temperature Sensor
-FermoTemp™ Electric Fermentation Heater Wrap

This bundle makes a great gift for brewers or winemakers of any skill level.

Additional Information
Support Documents:No
4.7 / 5.0
17 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Stars
Received product quickly and got my lager set up just before the cold snap here. It worked perfectly keeping my fermenter from freezing. Very pleased. The one and only issue is the instructions are so small I had to use a magnifying glass to read.
March 16, 2018
2 months ago
This thing brings the HEAT!
Tried the system for the first time on some Hopquila IPA....Working great! House is from between 68 and 65 degrees depending on day or nite but the wort is staying constant at 70degrees.....I would marry this thing if I could......
March 8, 2018
3 months ago
Must have for cold areas while fermenting
it was easy to set up, by default it turns on when it drops 3 degrees below the temp you set on it. i never used to brew in the winter because my room is colder than the rest of the house since it is in the basement, but this device will definitely make me brew a lot more in the colder months.
March 8, 2018
2 months ago
Must have piece of kit
Awesome. Easy to set up. I changed the factory “hysteresis” (which I’m more familiar with being called “gauge droop”) to writhing 1 degree F, and have never had any issues. Big Mouthed Bubbler fermenter with the 2 port lid.
February 17, 2018
3 months ago
Worked great. Reliable way to control temperature when fermenting. The combo package gives everything you need.
April 30, 2017
1 year ago
ThermoStar® Digital Temperature Controllers Work Well
I am using 2 of the ThermoStar® Digital Temperature Controllers and heater wrap, one for my wife's wine and the other for my first batch of beer. The fermenters are located in our basement, where the temperature gets down below 60 degrees, which is too cold for fermenting wine and ales. The controller is easy to configure and keeps both fermenters in the selected temperature range (70-72 for the wine and 66-68 for the beer). The set point and dead band are easily changed via keypad.

I would recommend this product to anyone who needs a warmer temperature than ambient for fermentation.
March 26, 2017
1 year ago
A must have!
I use these all the time. I use several at a time. One controls the ambient temp of my large fermentation chamber (Chest Freezer) and then I put one on each fermenter to make sure they don't drop below a certain temp. the combination holds the fermenting wort at just the right temp. Your beer will be so much better with better temp control regardless of what you brew.
January 18, 2017
1 year ago
Loving this
Makes me wonder why it took me so long to pull the trigger on this one. What a difference and extremely easy to set up and use. Only reason I didn't give it 4 stars is due to the need for electrical tape in attaching it to the carboy. Don't know the solution to that. May try bungees in the future. In any event, I would definitely buy this again and only wish I'd done so long ago. DO IT NOW!!!
July 31, 2016
Works Okay
We bought this kit and all the components are great the issue is with the controller itself I've messed with the advance settings and tightened to ridiculous parameters and the controller seems to be off a few degrees, we have other controllers that are far less messing around with the settings and hold the degrees within the specified range. So for us we use it for ale fermentation which is better than nothing.
June 30, 2016
Recent Purchase
As I have come to expect and I was not disappointed, the service by the person who took my call was friendly, knowledgeable, and very helpful. Northern Brewers is my go to supplier of all my brewing needs.
June 21, 2016
Start typing your question and we'll check if it was already asked and answered. Learn More
Browse 26 questions Browse 26 questions and 50 answers
I brew 10 gallon batches. I would be using this temperature controller on my two 5 gallon carboys with a chest freezer during hot days. However, how can I apply heat to those two carboys during winter time with this fermotemp??? If I need two heaters, can I use the just one temperature controller???
A shopper on May 17, 2017
BEST ANSWER: I also use a chest freezer, both winter and summer. In the winter, I just wrap the heater around my fermenter. I suspect that if your initial pitching temp is around 74 to get the yeast going while the wort is cooling to the 68 I ferment at, then you could unroll the heater and set both carboys on top. That, plus the heat of fermentation, should be able to keep the temp up. Or maybe center it between both carboys & tape half to each one. That'll still give good surface exposure. That's just a guess, but would probably work. If it still would be a little low, try a small incandescent light bulb in the freezer. Might just do the trick. Post if you try either and they work. I do like the controller, & it's easy to unplug the heater, flip a switch and plug in the freezer if it gets too warm.
Can I use this on a stainless conical fermenter?
A shopper on Feb 3, 2018
BEST ANSWER: As long as it’s not insulated you certainly can use the heat wrap. The longer temperature probe should work in most fermenters. It goes through a traditional bung, same size hole as where you’d put an airlock. You still need to use an airlock. So just make sure you either get a bung with two holes or some fermenter lids allow you to have two bungs.
I brew 10 gallon batches using two 5 gallon carboys for fermentation. How can I used this items to apply heat to both carboys during winter time??? They will be inside a chest freezer during fermentation
Jose A G on May 17, 2017
BEST ANSWER: Place temp probe into a third container with water. The two carboys should adjust. Note that during fermentation, temps in the carboys will rise relative to the water, so keep that in mind in setting your temp range. Other option is to tape probe to one of the carboys, the ither carboy will tag along with the temp.
I already own a ThermoStar Digital Temperature Controller, can I buy the probe and heater wrap separately?
A shopper on Apr 25, 2017
BEST ANSWER: Hi there, we do sell the extended probe, sku 41265, and the heat wrap, sku 41978. You can type the sku numbers into the search bar to pull them up. Cheers!
So out of the box I plug the thermostar in and hook it up to the wrap and set it up to my carboy in a closet that normally sits between 50-58 degrees this time of year. I set it to a healthy ferm temp and it heats it to near that temp, am I missing something here?
M A on Feb 18, 2016
BEST ANSWER: Thats it. It will drop about 3 degrees then kick on the heat wrap and shut off at your target temp. Ive used this on both carboys and plastic buckets.
Can this kit be used to regulate temp on the Big Mouth Bubblers, or is it recommended for glass carboys only?
B R on Oct 15, 2015
BEST ANSWER: I have a Big Mouth Bubbler, glass carboy, and an SS Brew Bucket. I pitched this system because the manufacturer instructions specifically state it can be used on all three types of fermentors. It is a decient set up and very easy to use. Two thumbs up.
Would this heater keep up if used on a glass carboy was inside a working refrigerator?
A shopper on Jul 22, 2017
BEST ANSWER: You'd probably be alright getting up to lagering temperatures inside a working refrigerator with this if you also don't set the fridge too cold. Overall this is not a very powerful heater and can only really increase a 5-6 gallon carboy up to about 15F above the ambient temperature that it's in.
Can the temperature tolerance for the Thermostar be adjusted to less than 3 degrees? For instance, can I set the tolerance to +/- 1F?
Michael R on Jul 18, 2016
BEST ANSWER: I believe you can, but there would be no good reason to have it set so tight. With a heating appliance, it would be switching on and off very frequently to maintain that temp; with a refrigerator/freezer having it set like that could cause problems for the refrigeration compressor. These units will allow more time for a refrigerator's compressor to "rest" so it is not damaged by the unit turning it off and on repeatedly. Having a few degrees of tolerance allows it to change temp a bit more, but it will be fine, it would not need to be held at such a close tolerance. -Mike W, Northern Brewer
It's winter and the thermostat in my house is set between 61 and 69 degrees and I want to maintain my fermentation temperature at 66 degrees. Can I use the temperature controller on my refrigerator and the heat wrap simultaneously to maintain my fermentation temperature?
Scott Yaklofsky on Feb 10, 2016
BEST ANSWER: This is not recommended. The thermostar will only control one item at a time and only in heating or cooling mode. Unless you want to swap the setting from heat to cool, and connect a new device accordingly, you will run into problems trying to do both accordingly. That being said, a fermentors temps will change slowly so this kit will help you avoid getting lower than 66(within 2 degrees, but this parameter can be customized in settings) but the temp may free rise slightly as your house temp rises. I hope this helps answer the question!
What is temp range on this? I am making kambucha (alcoholic tea) and I need it be able to handle 68-78 degrees Fahrenheit. Thank you.
J E on Jan 6, 2016
BEST ANSWER: Unfortunately, I haven't used the fermentation kit yet. I received it as a present to supplement my existing chiller when I have more than 10 gallons of wort fermenting. However, from the research that I did and the fermentation kit's specs I would think that 68-78 F would be right in it's sweet spot. Those temperatures span the temperatures for fermenting ales, which are the most common home brewing products. Good luck and I'll try to remember to submit a review when I put the fermentation kit to use.
what is the height and length of wrap?
O H on Nov 27, 2015

It is about 12" x 25.5" in area and fits a 6.5 gal carboy well.
Is this the dual-mode temp controller?
R E on Nov 27, 2015


the included controller can be found here: http://www.northernbrewer.com/thermostar-dual-mode-digital-temperature-controller
How exactly does the wrap chill the fermenter below room temperature?
C M on Nov 8, 2015
BEST ANSWER: The wrap doesn't chill

it is only used to add heat

say for ale fermenations in a basement in the middle of a Minnesota winter. The Thermostar Digital Temperature controller will will only cool if it is used in conjunction with a freezer



or keezer. It is in the simplest of terms

a very precise thermostat.
Does the temperature probe go in the wort?
J U on Oct 27, 2015
BEST ANSWER: The 12" probe can be sanitized and inserted directly in to the wort

alternately you may just tape it to the side of the fermentor.
will this work with your fast fermenter?
Mark V on Oct 24, 2015
BEST ANSWER: It will work with the FastFerment with some caveats.

The FastFerment is conical as opposed to a straight cylinder so the heater will wrap around it a bit oddly (picture the shape of a waffle cone to get the idea). Also the temperature probe on the thermostar was not designed specifically for the thermowell in the FastFerment. You can still use the probe in it

but it will need to be affixed with a piece of masking tape.

Gabe from NB
Is this unit waterproof in the event for spill over from the carboy?
James F on Oct 15, 2015
BEST ANSWER: I would not call it waterproof. The leads are connected to the heating pad with two plastic connections. The connectors are oriented horizontally, so they may withstand some drops and minor spills, but a major fermentation disaster or an immersion will likely lead to a short circuit or unsafe conditions.
Does this device only warm?
James F on Oct 15, 2015

Thanks for you question. This kit includes ThermoStar Digital Temperature Controller - ThermoStar 12? Temperature Sensor - Electric Fermentation Heater Wrap. With the kit as configured it only heats.
I will be using this product in a basement freezer in an old cabin and I don't necessarily plan on checking it daily. Is there any fire risk associated with using this product in a confined space like a freezer I should be worried about?
P A on May 20, 2016
BEST ANSWER: The main concern I could think of is if the freezer is humid - as any extra moisture could cause a short. We don't recommend leaving things unattended for long as murphy's law states that if something can go wrong, eventually it will. Cheers.
What is a "cooling jacket"? Or, the question is, how do I use this to maintain a temp that is cooler than my room temp if not able to use a fridge set up?
R U on May 17, 2016
BEST ANSWER: There are fermentation cooling jackets on the market that can cool a small fermenter outside of a refrigerator, we don't currently sell any. You would need some sort of cooling unit to control for this device to be useful for that. Alternately, a person can just hold the fermenter in a tub of cool or cold water ( change out frozen 2-liter bottles of water in the tub ) to hold down fermenting temps. It's more work-intensive, as you must check on it frequently, but it's an affordable way to keep temps much cooler than room temp. -Mike W, Northern Brewer
Does NB sell a cold equivalent wrap that I can use w/ the thermostar temp controller?
H U on Apr 1, 2016
BEST ANSWER: Hello Andy,

Thank you for choosing Northern Brewer! We do not sell a cold wrap. I actually don't think anyone does, as that would be a fairly complicated system. The heat wraps work on resistance, a slight over powering of a certain gauge wire, with an increased amount of electrical resistance causes the wire to heat from the restricted flow of electrons through the wire. For cooling, you need some sort of compressor like in a refrigerator or freezer to compress a solution into a gas state where it sheds the heat, and turns back to a liquid to absorb more heat from the area that is being cooled. Though it probably would be possible, it would probably be a pretty expensive set up. In commercial breweries, a glycol cooling system is used, but these are quite spendy. The cheapest route for the homebrew scale, would be a refrigerator or freezer with a temperature controller like the thermostar or johnson controller hooked up. I have also had good luck with ice/water baths in a well insulated cooler as a less expensive, less accurate method of cooling a fermentation. I hope that this helps!
Will this work with 2 gallon buckets and/or 1 gallon jugs, or would the mat be a better alternative?
N A on Feb 16, 2016
BEST ANSWER: The heater-wrap would not fit well onto those buckets, or onto a 1-gallon jug. The heat mat should work better for those style fermenters. -Mike W, Northern Brewer
will this work on a 6 gallon bucket?
W L on Nov 22, 2015
BEST ANSWER: Yes it will
Couldn't I just buy the Thermostar controller and Electric fermentation heater separate for a cheaper price and just connect them? Or is the heater in this package directly connected to the controller? Can someone clarify this?
N B on Nov 18, 2015
BEST ANSWER: This kit also includes the the 12" temperature probe for the ThermoStar

which is $29.99. If you didn't want to use the temperature probe you could still use the electric fermentation heater and ThermoStar together

the temperature readings just wouldn't be as accurate.
How is the probe placed. Say for example I use this set up with a 6 gallon glass carboy, where does the probe go.
Alexander Y on Oct 25, 2015
BEST ANSWER: The 2" included probe can just be taped to the side of the fermentor. This gives a surprisingly accurate reading. Use bubble wrap or foam to avoid putting tape on the probe and increase the surface contact.
Can this be used at lagering temperatures? What is the range of controlled temps?
Ryan P on Oct 20, 2015
BEST ANSWER: Yes it can

the Thermostar has a range of -50F to 300F
Are these wraps suitable for use with a Big Mouth Bubbler - 6.5 Gallon Plastic Fermentor?
N I on Sep 3, 2015

the wrap can be used with the 6.5 gallon Big Mouth Bubbler-Plastic.

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