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FermoTemp™ Electric Fermenation Heater

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FermoTemp™ Electric Fermenation Heater

SKU: 41978

To consistently create your favorite beer or wine you’ll need precise control of your fermentation temperature. Take control of your fermentation with the FermoTemp™ electric heater. Attach the FermoTemp™ to a fermenter to raise the temperature of fermenting beer or wine.

For best results, pair the FermoTemp™with a digital temperature controller such as our ThermoStar® Dual Mode Digital Temperature Controller.


The FermoTemp™attaches to glass, plastic, or stainless steel fermentors using electrical tape. Extra thick construction ensures durability to withstand the knocks and bumps encountered in your brewhouse. For precise temperature control and optimal results, use the FermoTemp™ with an electronic temperature controller, such as the ThermoStar® Dual Mode Digital Temperature Controller.
The FermoTemp™ works well with plastic buckets, fermentation boxes, and particularly well with our Big Mouth Bubblers®.
It plugs into a standard North American electrical outlet. 110 volts. 35 watts.
Dimensions: Height: 11" Length: 25.625"

  • Do not immerse in liquid!
  • Do not insulate both sides!
  • Do not use if the heater shows signs of abrasion!
  • Do not set fermenter directly on top of heater!
Details & Instructions

Additional Information

5.0 / 5.0
8 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Works well in cold climate .. make ale brewing possible
April 17, 2019
1 year ago
I like it.
Works really good with my Inkbird to maintain lager temperature during the cold weather. Am still trying to find an adhesive tape that will hold but seems to work fine just resting against the fermenter.
December 23, 2018
10 months ago
Fermotemp is a win!
Purchased the Fermotemp to help with diacetyl rests and ale fermentations. Works perfect. Temp easily raises to the top end of ale fermentation temps. I also purchased the Thermostar thermostat controler. Both together is a must to acheive a solid fermentation without the worry of esters and diacetyl ruinning your beer. Great purchase ????
January 27, 2018
1 year ago
Keeps a consistent temperature
Fermented in a cool basement, set the batch on wood, wrapped the heater around the bucket and carboy, kept temperature at desired temperature the entire time.
May 8, 2017
over 2 years ago
Works great with the controller I have and keeps a good solid temp
April 3, 2017
over 2 years ago
Just the ticket
My brew area is cool and fermenting wine would be difficult without this heat source, easy to install and works welll with the temp controller.
March 10, 2017
over 2 years ago
Easy to use
Just a few seconds taping it to the carboy and plugging it in and it was warming the beer. Doesn't get hot just warm.
January 18, 2017
over 2 years ago
Like it very much keeps a constant temp. Most likely I will be buying another one.
January 17, 2017
over 2 years ago
Customer Q&A
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Browse 8 questions Browse 8 questions and 20 answers
Will this work with the Catalyst?
A shopper on Jul 12, 2019
FermoTemp™ Electric Fermenation Heater
FermoTemp™ Electric Fermenation Heater
The Catalyst Conical Fermenter w/ Stand
The Catalyst Conical Fermenter w/ Stand
BEST ANSWER: As the fermenter is conical shaped, it will he hard to have the FermpTemp make complete contact. Maybe if you got the UV Jacket for the conical
Would this keep a 6 gallon batch above 90*f in a 70* f room for a hi temp yeast like Hornindal Kveik?
A shopper on Oct 26, 2018
BEST ANSWER: I have not used the yeast that you mentioned but your main concern sounds like a desire to achieve a temp. above 90 f. I ferment in a room with a similar constant 70 f temp.When I used this unit, It struggled to increase the batch in a 6 gal carboy 2-3 degrees. I used a blanket wrap along with this item and it still didn't increase it nearly where you want it to go.
This fermentation heater can be used several times ?
A shopper on Mar 11, 2018
BEST ANSWER: Certainly, it is very durable. I use electric tape at the 4 corners. You should get one of the temperature thermostats too. Without one these will take your wort/must to 90+ degrees. I have 3 of these and 3 thermostats.
Will the Fermotemp Electric Fermentation Heater work with this bucket?
A shopper on Dec 12, 2017
FermoTemp™ Electric Fermenation Heater
FermoTemp™ Electric Fermenation Heater
Master Vintner® 7.9 Gallon Fermenting Bucket
Master Vintner® 7.9 Gallon Fermenting Bucket
BEST ANSWER: It should work fine. It just wraps around the outside of the bucket and has a temperature sensor probe. I tape the probe to the outside of the bucket, then just use masking tape to tape the heater over the temperature sensor and to the bucket.
Where do you put the temperature Probe when using the wrap on a caroby?
A shopper on May 26, 2017
BEST ANSWER: I actually use it for another purposes but I'd put it about 1/3 below the surface off to one side. If you set to he max temperature then put it nearer the top and closer to he side. And be consistent with placement to keep better control between batches.
I only bought the wrap and not the controller, can I just wrap it and turn it on and store it in a (sometimes VERY) cold place? will it maintain a good temperature for fermentation if the surrounding temperature fluctuates?
A shopper on Jan 17, 2017
BEST ANSWER: Here is what I would do if you didn't buy the controller, fill the fermenter with water and put the wrap around it in the place you plan to ferment at. Then monitor the temp on a daily basis to see if it keeps you at the temp you want. I did this with the controller and got it to a point that I can live with.
What temperature does the Fermotemp sustain at without the Thermostar?
Donald R on Jan 2, 2017
BEST ANSWER: I believe that the temp fluxuates with the volume of liquid. I use 6 gal carboys and the temp stays between 74 and 76 degrees. Although I used one to warm water for a new kit which was 4 gallons and the temp was 80 degrees. They work well in my basement this time of year with the temps in the upper 30's and the lower 40's. Hope this answers your question.
Can it be used on both glass and plastic bottle type fermenters ?
A shopper on Dec 5, 2016
BEST ANSWER: Yes; check the description for more details.

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