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Thermacell MR300 vs MR450 (2021): Comparing Portable Mosquito Repellers

For many outdoor enthusiasts, mosquitos are not just pesky annoyances but threats to health as well. However, insect repellents and even mosquito nets aren’t exactly the most convenient and comfortable way to protect yourself. If you’re one who likes to hunt or camp, then it’s time to look into Thermacell’s portable mosquito repellers. Known for its area repellents, the company has taken its DEET-free technology and created a lineup of handheld models. Below, we compare Thermacell MR300 vs MR450 to see which should be a staple of your outdoor gear.

Thermacell MR300 vs MR450 Mosquito Repeller Comparison Chart

ModelThermacell MR300 Portable Mosquito RepellerThermacell MR450 Armored Portable Mosquito Repeller
 Amazon productAmazon product
PriceAmazon productAmazon product
TypePortable area repellentPortable area repellent
Active IngredientD-cis/trans allethrinD-cis/trans allethrin
Protection Zone15 ft.15 ft.
Power SourceFuel cartridgeFuel cartridge
Cartridge Duration12 hours12 hours
Refill Mat Duration4 hours to 12 hours, depending on mat4 hours to 12 hours, depending on mat
Zone CheckNoYes
Rubber ArmorNoYes
Dimensions7.8″ x 2.9″ x 1.8″7.8″ x 2.9″ x 1.8″
Weight0.4 lb0.4 lb

Design and Technology

The Thermacell MR300 and MR450 are portable mosquito repellents available in a few different models and exteriors.

Thermacell MR300 vs M450 Mosquito Repeller Design and Technology
Here’s a look at what you get in the box from the Thermacell MR300 and MR450.

The Thermacell MR300 and MR450 use the same technology as the rest of Thermacell’s fuel-powered repellents. You can read more about how area repellents work in our previous Thermacell reviews. Instead of a large device, however, you’re getting a portable model.

Designed to lay flat on a surface instead of standing up, the MR300 and MR450 look like a combination of a flashlight and remote control. The wider section is where the refill mats are inserted underneath the vents. Meanwhile, the handle contains the switch and accommodates the fuel cartridge.

Based on the specs, the MR300 and MR450 have the same dimensions. But in reality, the MR450 is chunkier, thanks to the addition of a rubber armor case. The case also gives the MR450 a better grip. Plus, Thermacell’s latest portable repellent comes with Zone Check, a visual indicator that tells users if the zone of protection has been created.

Now Thermacell offers the MR300 in four different colors. It also comes in two special editions β€” a fish bundle with a clamp and a hunting pack that includes a holster. The MR450, on the other hand, is available only in black and gray. It’s also compatible with a holster but the accessory must be bought separately.

Performance and Fuel Duration

The Thermacell MR450 has a more durable body and a quieter ignition than the MR300.

Thermacell MR300 vs M450 Mosquito Repeller Performance and Battery Life
Here’s a look at how these Thermacell portable repellents work.

Both the MR300 and MR450 create a zone of protection 15-feet wide. It’s an impressive radius comparable to standalone area repellants like the Thermacell Patio Shield and Radius. Like other Thermacell fuel-powered devices, the fuel cartridge on the MR300 and MR450 also last 12 hours. Now, you only get one cartridge out of the box. Refills, on the other hand, come in a pack of four.

Meanwhile, the heat-activated repellent mats vary in duration. The Original Mosquito Repellent Refills, for instance, last up to four hours. On the other hand, the Max Life variant typically lasts up to 12 hours per mat. There’s also an earth-scented option but with a similar duration as the Original. Thermacell includes three of the Original mats with every purchase of their portable repellent. If you’re stocking up refills, you can get the Original variant in packs of 3, 12, 30, or 75.

Between the two devices, the Thermacell MR450 operates more discreetly. Thermacell shares the portable repellent features a quieter ignition system than the Thermacell MR300. This should come in handy among hunters who don’t want to scare off game when turning on the device. The MR450’s rubber molding, on the other hand, gives the device a hard-wearing quality. If you tend to drop your gear often, you’re assured the MR450 will be fine.

User Reviews

Both the Thermacell MR300 and MR450 work but with a few caveats.

Thermacell MR300 vs M450 Mosquito Repeller Uuser Reviews
On the left, the key features of the Thermacell MR300; on the right, typical outdoor settings where the repellents work.

But how well do these devices work in real life? A quick look at the Amazon listing shows both the Thermacell MR300 and MR450 have similar ratings. Users highlight the effectiveness of the repellents against both mosquitos and no-see-ums. The MR350, for instance, works particularly well in gardens and camp settings. Outdoor enthusiasts also vouch for the MR450. The latest Thermacell portable repellent comes highly recommended for hunting and canoe trips, as well as for use at home.

How about when it comes to Thermacell MR300 vs MR450 Reddit reviews? Just like on Amazon, both repellents are well-regarded on the site. Reddit users share that these devices work well in both home and outdoor settings. But there is a caveat. Based on comments, Thermacell’s portable repellents are effective but dependent on the environment. If you’re stationary or there’s no wind in an area, you will get a strong zone of protection. But if you’re moving or your location is breezy, they don’t work quite as well.


The Thermacell MR300 is a great choice for most people. Those who enjoy hunting, however, might like the quieter operation of the Thermacell MR450.

Amazon product

Portable repellents are a great addition to your outdoor gear. But they’re also a compact alternative to standalone area repellents for your home. Here, the Thermacell MR300 and upgraded Thermacell MR450 are solid choices. When it comes to functionality, however, there’s hardly a difference between the two models.

Both devices boast a 15-feet zone of protection. They also use the same 12-hour fuel cartridge and are compatible with the same repellent mats. The MR450, however, comes with a Zone Checker, which makes it easier to know if you’re already protected. It also features a rubber-armored design and a quieter ignition system that’s ideal for outdoor and hunting trips.


πŸ“Œ What’s the difference between the Thermacell MR450 and MR300?

The Thermacell MR450 is an upgraded version of the MR300. As the latest model, it boasts a quieter ignition system, redesigned grills, and a rubber armor exterior.

πŸ“Œ Is the Thermacell MR300 easy to use?

Thermacell banks on the user-friendliness of their devices. In fact, the Thermacell MR300 instructions only have four steps. The steps include inserting the repellent mat and fuel cartridge and then turning on the device. Afterward, you simply check the view window and place the device at the center of an area you want to be protected.

πŸ“Œ What’s the usual comment when it comes to Thermacell MR300 reviews?

Based on reviews, the Thermacel MR300 is effective. It’s also a great repellent for both home and outdoor settings. People vouch for the MR300 since it’s cheaper than the MR450 while featuring more or less the same functionalities.

πŸ“Œ How long is the warranty of the Thermacell MR450?

The Thermacell MR450 carries a one-year warranty. It can be extended to two years with registration to the Thermacell website.

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Mari Bassig

Senior Editor, writer and researcher passionate about gadgets, social media, and music.