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The amount of liquid in each rechargeable cartridge varies depending on the number of protection hours. For our larger cartridges, a 40-hour refill will be completely full, while a 36-hour refill will have slightly less liquid. For our smaller cartridges, the 18 hour will be about ½ full, the 12 hour will be about ¼ full, and the 8 hour will be just below ¼ full. Please click here for a visual chart of all refill levels.

Thermacell refill costs depend on the type of repeller being used. Fuel-powered Thermacell repellers require fuel and mat refills, while rechargeable Thermacell repellers use rechargeable refill cartridges. Pricing varies by product type and package size. All value packs that provide 120 hours or more of mosquito protection cost less than $0.50 per hour of coverage.

For the Radius, maximum repellency performance occurs within 10 feet around the device (110 sq ft). Repellency may extend beyond this range, but the level of protection will decline as you go further from the device.

The E-ZoneGuard Rechargaeable Repeller provides a 20 ft zone of protection against mosquitoes.  It will begin creating a zone of protection around the device within minutes, but to experience optimal results in the full zone, the repeller should be allowed to run for at least 15 minutes. 

The Thermacell Radius Gen2 device has the below improvements over the Gen1.

• Improved Sonic Welds on the top cover.
• Improved Air Flow.
• Improved Repellent Dispersal.
• Simplified User Control.
• Improved PC Board.
• Improved Battery.

If your E-ZoneGuard Rechargeable Refill leaks, please wipe off any repellent residue with a cloth or paper towel from the repeller. The refill should still be good to use in your repeller. Please wash hands after cleaning of the repellent cartridge. 

To change the battery in the Fuel-ZoneGuard Extreme Mosquito Repller (MR450):

1. Remove the two screws on the back of the device that secure the battery compartment cover.
2. Once the cover is removed, you sill see a small white batter tray (batter caddy) inside. Carefully slide the tray out.  If needed, use a small flat-head or pointed tool to gently assist with removal.
3. Insert the new lithium battery into the tray, making sure the positive (+) side of the battery aligns with the positive (+) marking on the tray.
4. Slide the tray back into its housing until it is fully seated.
5. Reistall the battery compartment cover and secure it using the two screws you removed ealier.
6. Install your cartridge and your MAT, turn the device on and press the igniter a few times. In about 10-15 minutes the LED indicator will be solid blue. Click here for more information and visuals on how to replace battery. 

Refills for Fuel-ZoneGuard Fuel Repellers:  Fuel-ZoneGuard Base, Fuel-ZoneGaurd Extreme, Fuel-ZoneGuard Glow Small Lantern, Fuel-ZoneGaurd Glow Torch,

Any of the below products are compatible with your Fuel-ZoneGaurd repellers:

 Fuel-ZoneGuard Mosquito Repellent Refills Package contains both mats and fuel cartridges and are available in:

• 24 hours (contains six 4-hour mats and two 12 fuel cartridge)
• 48 hours (contains twelve 4-hour mats and four 12-hour fuel cartridges)
• 120 hours (contains thirty 4-hour mats and ten 12-hour fuel cartridges)
• 300 hours (contains seventy-five 4-hour mats and twenty-five 12-hour fuel cartridges)

The Fuel-ZoneGuard Multi-Insect Repellent is designed for use exclusively with Fuel-ZoneGuard Repellers. These repellers use butane fuel as their power source and rely on repellent mats to provide insect protection.

Thermacell Fuel-ZoneGuard Repellers carry a limited one-year warranty from the date of purchase. If you register your product on the form below, we will increase this to a two (2) year warranty from the date of purchase. Click here for the warranty registration form.

Thermacell Fuel-ZoneGaurd Repellers provide effective mosquito repellency for an area up to 15 x 15 feet (225 square feet), the size of an average deck or patio. You may use more devices to protect larger areas.

The fuel supply may be empty. If a replacement fuel cartridge is needed, please turn the unit off and replace the cartridge according to the instructions provided with the product.

If your Fuel-ZoneGuard™ Repeller does not appear to be repelling mosquitoes, first make sure the device is operating properly and that the orange glow is visible in the viewing window. Also, confirm that you are using a fresh blue repellent mat.

The C-15 (butane cartridge) is manufactured from Nylon 66, Brass (the nozzle) and a rubber gasket.

You can find the guide here.

We understand you are having some lighting issues with your device. Please try the following troubleshooting steps:

1. Ensure fuel cartridge is full.
2. Tightly screw the fuel cartridge into the fuel port.
3. Turn to the on position and wait 10 seconds for gas to flow.
4. Repeatedly click the start button (you should hear clicking noise).
5. Check the view hole window to see if the orange glow is present.
6. Make sure nothing is covering the grill of the device.
7. If the above does not work.  Please turn your repeller onto the on position wait 4 minutes and then press, click the igniting button to see it the repeller will light. 

If the troubleshooting steps do not work, please reach out to our consumer support team at Contact Us so we can review other options. 

Thank you.

1. The Gen2 backpacker has an improved injector regulator valve assembly. It also has a less tolerant valve threading receiver. The Gen2 will in most cases have a batch code number on the valve stem that starts with the letter B####. The Gen2 packaging will also have the following identifiers:

• A yellow bar across the front that reads 16 hour protection.
• The SKU may be listed as MRBPR.
• Gen 2 has a plastic orange ring at the stem bottom base.

We hope this helps answer your questions, please feel free to Contact Us if you have anything further.

Please ensure that you screw it down the Backpacker completely vertical. Do not hold it an angle as the gas canister will create condensation if held at an angle. This can cause the regulator to be impaired.

Next please ensure that you screw the device down on the the gas canister fully (hand-tight).

Then turn the device on and listen for the gas flow, if you hear the hisssss of the gas releasing, let it do this for about 20 seconds, then hit the igniter a few times. If it still doesn't work, please let us know and we'll take the next steps in replacing the device. Contact Us  Thank you.

For storage of fuel-powered products, Storage:

• Store unused mats in a cool, dry place inaccessible to children and pets.
• Store mosquito repeller and fuel cartridges in a cool, dry place away from sources of heat.

Disposal: If the cartridge is empty or for used mats:

• Do not reuse empty packaging, wrappers or cartridges.
• Do not puncture or incinerate empty cartridges.
• Place in trash or offer for recycling if available.
• If the cartridge is partly filled or for unused mats: Call your local solid waste agency for disposal instructions. Never place unused mats down any indoor or outdoor drain.

Fuel-ZoneGuard Refill fuel cartridges are recyclable. Please recycle where #7 plastics are accepted.

Fuel-ZoneGuard Butane Refills: The package contains the fuel cartridges only, mats are not included.

These are available in:

• 48 hours (four 12-hour fuel cartridges)

Click here to shop these refills on our site.

Fuel-ZoneGuard Max Life mats last 3xs longer than Fuel-ZoneGuard refill mats.

Package Includes four 12-hour repellent mats and four 12-hour fuel cartridges.

Click here to shop these refills on our site.