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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
13 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Stars
A worthwhile investment...BUT instruction manual needs improvement
After messing up 2 brews due to inconsistent fermentation temperature, I made the investment in this kit and a freezer. I feel the THermoStar instruction manual is kinda poorly written unless you have a background in electronics (which I don't), otherwise it would be a 5 star review. Important things I learned: 1) the device that is plugged into ThermoStar does not turn on until it needs to be on to control temp TO THE DEVICES CURRENT SETTINGS, NOT just the temp setting. My yeast required 65-72 degrees so I set the device at 70, and nothing happened. I set it to 68, and nothing happened. I thought my freezer was broken because the freezer running light never came on, or that the ThermoStar was broken. As a last ditch effort, I set it at 60, and it finally came on. So what was wrong? 2) you need to set hysteresis! I set temp at 68 and hysteresis at 2 degrees, and it kicks the freezer on once temp is above 70 and then turns it off once it hits 68. Boom! And its worked perfectly since. If the directions clearly stated these 2 things, this device would be SO easy to use even for electronics-incompetent people like myself. I still have yet to use the heating portion of the kit, but now that I understand the ThermoStar, I don't anticipate any issues.
October 28, 2015
Everything as expected. Works perfectly as a temp controller. Using to regulate temp in a chest freezer.
February 4, 2016
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
6 months ago
Great product!
My garage gets to the mid 30s in the winter and low 100s in the summer. With a simple chest freezer and the heating element I can keep my wort between 62-68 degrees no matter what the ambient temperature in the garage! I am very pleased with this product and have had the best results yet during primary fermentation on my most recent brew.
January 2, 2016
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
11 months ago
Worked great. Reliable way to control temperature when fermenting. The combo package gives everything you need.
April 30, 2017
4 months ago
Works as promised!
Just remember to check the advanced settings. By default mine was set to drop over 3 degrees before kicking on. It did that for about a day before I figured it out. Otherwise works great.
March 1, 2016
Ferm kit w thermostar
Great product, great price! Temp control was easy to use And works perfectly for my keezer. Used the heat wrap for finishing of primary fermentation by ramping my 68 degree beer to 72 before racking. Worked like clockwork!
January 29, 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
Fermentation Kit
This product worked great! I loved being able to change temperatures at different times during fermentation.
January 31, 2016
Start typing your question and we'll check if it was already asked and answered. Learn More
Browse 25 questions Browse 25 questions and 49 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.
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.
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.
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 Y 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
will this work on a 6 gallon bucket?
W L on Nov 22, 2015
BEST ANSWER: Not sure. It will fit around the bucket, and you could dip the thermocouple for the temperature controller into the wort by drilling a small hole into the lid. I don't know, however, how well the plastic bucket conducts heat compared to a glass carboy.
The thing doesn't get more than hand-warm, so it won't melt the bucket, but whether it heats the insides I don't know. Probably need to thermally insulate the outside.
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
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
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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