Kombucha Heating Mats

Size *
Kombucha Thermostat Temperature Control

Available in 6 sizes 

Soft pliable heating mats. Very Durable. WaterProof.  (but don't use in water) 

Two year warranty from date of purchase.   (twice as long as our competitors) 


 1.  20 inch  x  3 inch  7 watts  fits nicely on most windowsills or wrap around fermenting jars up to one gallon. Since the wattage is low, really don't need a Regulator. Only takes the chill off for large containers. Best for pints and quarts. 

2.  20  x 10      18 watts   comes with sewn in 20 " velcro straps for easy wrap-a-round heat distribution. or can place containers directly on mat. Total span area (circumstance) is 40 inches. Compared to FERMWARP"S 24 inches and for wrap around use only. 

Fits around various size containers. Velcro straps expands to fit up to 40 inch diameter containers.

Fits 6 standard one gallon glass jars, and various combinations.  Most versatile & popular size heating pad. 

3.  20 x  20      45 watts     fits 12 standard one gallon glass jars over 400 square inches of surface area.  

4.  20 x  48     106 watts   fits 30 standard one gallon glass jars over 960 square inches of surface area.

5.  24  x  11     40 Watts    FermWrap  fits 3-5-7 Gal Carboys, Larger containers when used with duct tape to secure. Can be used on Oak Barrels.  Wrap-a-round only avoid getting wet. Most heat to surface area pad available. Thermostat Regulator  recommended to prevent overheating. 

6.  12  x  12     25  watts.  Hard Plastic Water resistant. 3 years warranty Fits 4 - 1 Gallon or 3 - 2 Gallon Jars, or 1 - 5 to 12 Gallon Containers.   Preferred in colder climates needing over 10 degrees F of extra warmth. Best for Wood Barrels up to 13 Gallons, Ideal for Brewing Cabinets. 

We have used these pads ourselves for over 20 years, and are very familiar with tall of them.  When used flat and with various size brewing and fermenting containers on top of the heating mats they will raise the temperature about 5 - 10F degrees over the ambient room temperature. As a wrap-a-around the temperatures may be raised 10-25F degrees but is limited usually to a single container. (depending upon size) 

If your room is 68F these heating pads generally will warm up the brewing containers to 73F - 78F. When you use the Wrap-a-Around method roughly 3 times the thermal effect can be achieved, though you are limited to the number of containers that may be warmed. For example a one-gallon glass jar may be warmed up 5-10 degrees when it is seated on the pad versus 15-30 degrees warmer when wrapped in the heating pad. Air flow and ventilation plays a role and one can move the wrap around pad slightly away from the container to manually adjust temperatures. - or use the Thermostat regulator just set-it and forget-it. 

Note. The colder the room the less efficient. With higher ambient, room temperatures or with smaller containers, you can use coins to lift the container above the heating pads. Of course our Heating Regulator will automatically adjust temperatures to your optimum settings worry free.  The more consistent the environment the more predictable and reliable will be your ferment and brew.  To warm your ferment in cold environments (consistently below 65F) one can create a Brewing Cabinet. This is basically a "Box with two holes, one on the bottom" one on the top, to allow ventilation and to trap / control the warmer air inside the box. Trapped air is easier to heat and maintain via the holes at top and bottom. Open, allowing greater air flow for cooler, and closed for warmer. Set your ferment inside the box (or a 3 sided box on top), Remember air flow is critical to a kombucha ferment (aerobic ferment) not so critical in anaerobic or lacto-ferments or yeast ferments.  see the FermenWrap Test on side panel. 

Our square 12 x 12 25 Watt is the best for Oak Barrels. Oak is heavy and insulates very well. It takes a larger wattage in a smaller area, to deliver efficient heat. The Brew Belts are also 25 watts and a small concentrated area however they result in burn marks along the belt line. The best choice for warming Barrels or to build a Brew Box. (see above) is our 12 x 12 25 watt heating pad. 

Made in China for the HappyHerbalist (20 x 3 made by Hydrofarm. 24 x 11 FermWrap Manufactured by Fermentap)

Our 12 x 12 25 watt heating pads are made in New Zealand for us. 

We created these specifically for Kombucha Brewing as well as for Ginger Beer and other Probiotic Soda ferments. 

Works with our optional Digital Temperature Thermostat  reads in F or C. Set it and Forget it ease. 

 Choosing the right size:

And more information please click on the DETAIL Tab above next to the DESCRIPTION Tab. 


 Satisfaction Guaranteed for TWO full years from purchase date. 

note: does not include Golden Retriever, Gecko or Kombucha Continuous Brewing Container. 

Questions - just ask  eddy@HappyHerbalist.com. 

Text 919-518-3336     toll free  888-425-8827

Availability Same Day Shipping
Height 5.00
Width 4.00
Depth 4.00
Sku SKU-1E662531
Warranty 2 years

Choosing the right size:
For example the 3 inch x 20, 7 watt pad versus the 10 inch x 20, 18 watt, and the 3/4 inch x 24, 25 watt Heat Belt.


1. What is the ambient temperature and how much do I need to raise that temperature?

The wattage is spread over the area (of the heating pad)

2. What size and type of container?

1 gallon. 2 gallon, 5 gallon, 10 gallon or larger.

Glass, Plastic, Ceramic, Clay, Wood?

Keep in mind that the heat generated by an active fermentation can warm up a typical 5 gallon batch by 2-10 degrees F. More so when brewing in Wood. Anaerobic fermenting holds the heat and generates more heat.

3. How many containers, and are they all the same size or different sizes.

Wrap a-round is the most efficient but limited to the number of units that it can heat.

Flat use can serve a variety of different containers and shapes.

Flat use (in my opinion) also has a better eye-appeal and is less messy to use. (personal choice)

4. Aerobic or Anaerobic Brewing?

This is important for Kombucha Brewers. Air flow / ventilation is important to aerobic brewing, and to maintaining lowest alcohol levels possible. An active ferment generates heat and evaporation. Overheating generates stress for the yeasts, higher acid production, and greater loss through evaporation. The O2 / CO2 balance affects a Kombucha ferment more so than anaerobic ferments. (or Second Stage Kombucha Ferments). Proper Temperatures can also be maintained by increasing / decreasing airflow.

5. Heating Area. There is a consideration for where the heat source concentrates. There are Top Feeding Yeasts (Ales) and Bottom Feeding Yeasts (Lagers). Bacteria like acetic acid producing bacteria (Kombucha) are more active on the surface. Lactic acid producing bacteria are all over the place. Not all are equal in their temperament (pun intended). Kombucha bacteria are active only over 74F-90F. Lactic Acid bacteria generally active 60F-90F. Lager yeasts like 40–54F while ale yeast favor 55–70F .Optimal temperatures vary considerably. Brettanomyces (Ale) being one of the higher temperature yeast in the 70 & 80's. Small brewing vessels due to thermal dynamics have little notice unless you're in the mid to high 80'sF. We recommend placement considerations when fermenting 10 to 40 Gallon. Over 40 gallons the brewing dynamics (especially of Kombucha) may change depending upon the shape of the container.

Heating pads makes for better, more predictable, brewing at very low cost.

Thermostatic Temperature Controls just makes life easier.

All our heating pads may be daisy chained (linked) together and used with one of our Kombucha Temperature Control Thermostats. (up to 1,000 total watts) Our units are Digital and can read in Centigrade or Fahrenheit. LED lights display the precise temperature from 68F to 108F. These units are designed to maintain the temperature that you set. Just set it and forget it.

Dimmer switch or retrostatic regulators will only maintain a certain constant heat output. In other words are always on. These are usually indicated by settings of High, Medium or Low. For example if the maximum output is say 10 watts (High) the output can be lowered to Medium (say 5 watts) or Low (say 3 watts). With a constant heat output the ferment remains in danger of overheating unless externally monitored by someone. (to unplug the unit when temperatures rise). The danger is more specific to smaller volume ferments in the pint, quart or 1/2 gallon size. A difference between 3 watts or 5 watts, (in the example above) may be negligible in a gallon or larger container. But you'll have to account for the differences in nighttime and daytime extremes. Remember all ferments do better in a constant environment. As a brewer your sole function is to give those microbes what they like most - they'll be Happy. You'll be Happy.

In summary our Digital Temperature Control Thermostats maintains the desired temperature (turns on/off) whereas a dimmer switch maintains a constant heat source much the same as any heating pad without any regulator.

Not really rocket science. But it does take some thought. But don't worry. We're here to help. If you find that what you bought doesn't work out the way you expected feel free to return for full purchase price or credit.

Satisfaction Guaranteed for TWO full years from purchase date.

note: does not include Golden Retriever, Gecko or Kombucha Continuous Brewing Container.

Questions - just ask eddy@HappyHerbalist.com.

Text 919-518-3336 toll free 888-425-8827
Kombucha  Heating Pads and Thermostat for precision temperature control. For Brewing, Fermenting, Gardening and Pets. 2 year warranty longest in the industry.
Digital Thermostat Regulator  controls up to 1,000 watts for multi heating pads Reads in F or C  Large easy read LED display. 2 year warranty. twice as long as the competition.
FermenWrap Heating Pad Testing Results.  Correct Temperature produces better results
Brewer's Heating Pad made in New Zealand for the HappyHerbalist Kombucha Fermenting
Heating Mats and regulator for Brewing, fermenting, seedlings, and peds