From HBF: Make sure the components you use are compatible and rated for your intended application.  Contact manufacturer with questions about suitability or a specific application.  Always read and follow manufacturer directions.

From the product description, check product page for current description, price and availability:

• EASY TO USE – 12″ Round fits under almost any size Carboy or Bucket Fermentor
• NATURAL HEAT – Bottom radiant heating mimics natures normal process in organic fermenting
• NO WRAP – No Wrapping, No Tape or Belts. Simply place under your Fermentor and plug in!
• TEMPERATURE REGULATION – Built in thermal control shuts off heater preventing overheating

From the product description, check product page for current description, price and availability:

• [Premium Quality structure]: Made of the extra-fortified plastic, more durable and the ergonomic design is easy to hold by hand. The high-quality components we use inside will not rust. OPULENT SYSTEMS does strict quality control process before shipments.
• [Easy to set up and operation]: Easy to use 3 buttons to set up temperature between Fahrenheit/Celsius according to your using habit. The packaging also includes the professional user instruction with the operation details.
• [High Level Reliability and Result] The temperature control within a range of 68-108 ºF and it is great for the professional gardener and grower to reliably monitor the temperature of your plant’s roots with as sensor probe and get the effective results.
• [Install and use anywhere]: You can hang the controller with flush on the wall or from a variety of hook sizes. Flexibly install with a 6FT power cord and 6.4FT probe cord. The UL certified 3 prong ground outlets ensue the safety. Compatible with any heat mat to plug into North American outlets, it is also a good option to use with OPULENT SYSTEMS heat mats.

From the product description, check product page for current description, price and availability:

• [Premium Quality structure]: Made of the extra-fortified plastic, more durable and the ergonomic design is easy to hold by hand. The high-quality components we use inside will not rust. OPULENT SYSTEMS does strict quality control process before shipments.
• [Easy to set up and operation]: Easy to use 3 buttons to set up temperature between Fahrenheit/Celsius according to your using habit. The packaging also includes the professional user instruction with the operation details.
• [High Level Reliability and Result] The temperature control within a range of 68-108 ºF and it is great for the professional gardener and grower to reliably monitor the temperature of your plant’s roots with as sensor probe and get the effective results.
• [Install and use anywhere]: You can hang the controller with flush on the wall or from a variety of hook sizes. Flexibly install with a 6FT power cord and 6.4FT probe cord. The UL certified 3 prong ground outlets ensue the safety. Compatible with any heat mat to plug into North American outlets, it is also a good option to use with OPULENT SYSTEMS heat mats.

From the product description, check product page for current description, price and availability:

• BREW IN ANY CONDITIONS Whether you’re brewing kombucha, wine or beer, the Kenley heating system lets you control the temperature of the vessel. You won’t run the risk of overheating your brew or letting it chill.
• CONTROL BREW TEMPERATURE EASILY This Kenley fermentation heating kit comes with a temperature controller which means that heater only kicks in when it registers a drop in temperature and stops running as soon as the right temperature is reached.
• USE YOUR EXISTING VESSELS Designed to work with almost any fermentation vessel up to 8 gallons, this Kenley fermentation heater is flexible and easy to fit snugly against the carboy. The 32x11in film simply wraps around the jar and is secured with the elastic bands supplied.
• SPEED UP BREWING TIMES Yeast activity slows as the temperature drops, but stops entirely if the temperature is too high. By maintaining a constant temperature, you can create the perfect conditions for the brew you’re using, reducing the brew time so you can create more perfect batches.
• MINIMAL ENERGY USAGE Each brew has particular needs, yet you may only have one environment, be it a chilly garage or a temperate spare room. The Kenley kit only uses the minimum energy required, unlike always-on systems, which keeps your energy costs down.

From the product description, check product page for current description, price and availability:

• BREW IN ANY CONDITIONS Whether you’re brewing kombucha, wine or beer, the Kenley heating system lets you control the temperature of the vessel. You won’t run the risk of overheating your brew or letting it chill.
• CONTROL BREW TEMPERATURE EASILY This Kenley fermentation heating kit comes with a temperature controller which means that heater only kicks in when it registers a drop in temperature and stops running as soon as the right temperature is reached.
• USE YOUR EXISTING VESSELS Designed to work with almost any fermentation vessel up to 8 gallons, this Kenley fermentation heater is flexible and easy to fit snugly against the carboy. The 32x11in film simply wraps around the jar and is secured with the elastic bands supplied.
• SPEED UP BREWING TIMES Yeast activity slows as the temperature drops, but stops entirely if the temperature is too high. By maintaining a constant temperature, you can create the perfect conditions for the brew you’re using, reducing the brew time so you can create more perfect batches.
• MINIMAL ENERGY USAGE Each brew has particular needs, yet you may only have one environment, be it a chilly garage or a temperate spare room. The Kenley kit only uses the minimum energy required, unlike always-on systems, which keeps your energy costs down.