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Removing weeds with chemicals is not always practical, but a full-size propane burner can feel excessive for small outdoor jobs. The Bernzomatic JT850 Outdoor Torch gives you a portable middle option with a 20,000 BTU brush flame, trigger-start ignition, and a 36-inch reach. It is easy to carry and simple to control, but it still demands careful fuel handling and strict fire safety. This review explains where the JT850 works well, where it falls short, and what you should check before buying.
Quick Verdict
Rating: 8/10
Best For: Small outdoor weed-control jobs, lighting fire pits or smokers, and light heat applications where portability matters.
Bottom Line: The JT850 combines a useful 20,000 BTU flame with a long reach and easy trigger ignition. Its main tradeoff is that it uses a small handheld propane cylinder and must be kept upright, so it is less suitable for long sessions or large areas.
| Specification | Detail |
|---|---|
| Brand | Bernzomatic |
| Model | JT850, model number 19425 |
| Product type | Trigger-start outdoor propane torch |
| Heat output | 20,000 BTU |
| Flame type | Adjustable wide brush flame |
| Reach | 36-inch arm |
| Dimensions | 39 x 8 x 2 inches |
| Listed weight | 1 pound, without fuel cylinder |
| Build details | Metal body, solid brass tip, and foam slip-resistant grip |
| Fuel | Bernzomatic 14.1-ounce or 16-ounce propane cylinder |
| Fuel included | No, cylinder sold separately |
| Warranty | Limited 3-year manufacturer warranty |
| Best use | Outdoor weeds, brush, fire pits, smokers, and suitable driveway-repair tasks |
Key Takeaways
- The 20,000 BTU wide brush flame is strong enough for targeted outdoor heating without moving to a hose-fed, high-output burner.
- The 36-inch arm reduces bending when you work near the ground.
- Trigger-start ignition removes the need to light the torch with a match or separate spark lighter.
- The adjustable control knob lets you change flame size and shut the flame off when the job is complete.
- The small propane-cylinder setup improves portability but limits runtime and requires you to keep the cylinder upright.
What Is the Bernzomatic JT850?
The Bernzomatic JT850 is a portable outdoor torch made for homeowners who need more heat and reach than a compact hand torch provides. Its long arm places the burner tip near the ground while your hand stays at a more comfortable height. A wide brush flame spreads heat across a larger target than a narrow precision flame.
The torch attaches directly to a compatible handheld propane cylinder, so you do not need a hose or a full-size tank. That makes it convenient for short jobs around a yard, driveway, fire pit, or smoker. The cylinder is sold separately, and the current manufacturer instructions specify propane fuel.
Who Should Buy It?
Best For
- Homeowners treating small groups of weeds on non-combustible surfaces.
- Grill, smoker, or fire-pit owners who want fast outdoor ignition.
- Buyers who prefer a portable one-pound-cylinder setup over a hose and large tank.
Skip If
- You need to clear a large area or run a torch for long periods.
- You need an indoor heat source or a precision torch for detailed work.
- Your local fire rules, drought conditions, or work area make open-flame use unsafe.
Before You Buy: Current Bernzomatic product information and instructions specify propane cylinders. Some older retailer text mentions MAPP or MAP-Pro fuel, but you should follow the current product label and manufacturer manual for your exact torch.
Essential Features of the Bernzomatic JT850 Torch
20,000 BTU Wide Brush Flame
The JT850 produces a broad flame rather than a narrow pinpoint flame. This design suits weed treatment, fire starting, and general outdoor heating because it covers more surface with each pass. The 20,000 BTU output is useful for short and medium jobs, but it is below the output of many hose-fed weed burners built for large properties.
Trigger-Start Ignition
You open the control valve and press the ignition button to light the torch. This is faster and safer than bringing a match or lighter near the burner tip. If the torch does not ignite on the first press, the manual directs you to press the ignition button again rather than using another ignition source.
Adjustable Flame Control
The control knob changes the flame size, so you can reduce output for a small target or open it for a broader heating job. The same knob turns the fuel off when you finish. It is a straightforward mechanical control, not an automatic safety system, so you must confirm that the flame is fully out before setting the torch down.
36-Inch Reach and Foam Grip
The long arm is one of the JT850’s strongest features. It keeps the burner near ground level while reducing repeated bending and crouching. The foam-covered handle improves grip, but you must make sure the grip does not slide over the torch’s air holes.
Portable Cylinder-Mounted Design
The torch attaches directly to a 14.1-ounce or 16-ounce propane cylinder. This setup is easy to carry and does not leave a hose across your work area. The tradeoff is less fuel capacity than a large refillable tank, and the cylinder must stay upright to prevent flare-ups.
How It Performs in Real Use
For Spot Weed Control
The brush flame works best when you sweep it across young weeds instead of holding it in one place. The manual advises keeping the flame about two inches above the ground and moving the burner tip back and forth. Your goal is controlled heat exposure, not setting the plant or surrounding material on fire.
For Lighting Fire Pits and Smokers
The trigger ignition and long reach make it easier to light suitable fuel from a safer distance than a short hand torch provides. Keep the propane cylinder away from direct heat, point the flame away from your body, and never use the torch near flammable liquids, vapors, or enclosed spaces.
For Small Driveway Repair Tasks
Bernzomatic lists driveway repair as a supported use, and retailer information mentions asphalt crack work. Use the torch only as directed by the repair-material instructions. Do not heat brick or concrete directly, because rapid heating can cause those materials to crack or break apart.
For Short Yard-Cleanup Jobs
The one-pound torch body and small cylinder are easier to move around than a hose-fed burner. This is helpful when you have a few separate work spots. For long fence lines, large gravel areas, or repeated professional use, a larger-tank system may provide better runtime.
Pro Tip: Start with a room-temperature propane cylinder, keep it upright, and work in short sweeping passes. Stop immediately if the torch produces a large yellow flame or begins to flare.
How to Use the JT850 Safely
- Inspect the torch. Do not use it if the body, valve, tip, or ignition system appears damaged.
- Close the valve. Turn the control knob fully clockwise before attaching the cylinder.
- Attach the propane cylinder upright. Hand-tighten it until fully seated. Do not force the connection.
- Check for leaks. Apply soapy water to the connection. Disconnect the cylinder if bubbles appear. Never use a flame to test for leaks.
- Clear the area. Remove flammable debris and keep a fire extinguisher and bucket of water nearby.
- Wear protection. Use eye protection and gloves, and keep other people and children away.
- Light it away from your body. Open the valve about one-quarter to one-half turn and press the ignition button.
- Keep the cylinder upright. Tilting it more than 60 degrees may cause the torch to flare.
- Shut it off before setting it down. Close the valve, wait for the flame to go out, and place the torch on a non-combustible surface until the tip cools.
Use the torch only in a well-ventilated outdoor area. Wind can carry flame or sparks, while bright sunlight can make the flame difficult to see. Never leave a lit torch unattended, use it for space heating, or operate it near flammable fumes or liquids.
Cleaning, Storage, and Maintenance
Before each use, check the cylinder connection, valve, ignition button, burner tip, and handle. Do not modify the torch or try to repair a damaged unit. Contact the manufacturer or retailer if it leaks or malfunctions.
After use, close the valve and allow the tip to cool completely. Disconnect the propane cylinder before storage, then store the torch and cylinder separately in a well-ventilated location that children cannot reach. Do not expose the cylinder to temperatures above 120°F or prolonged direct sunlight.
Pros and Cons
Pros
- 20,000 BTU wide brush flame handles several common outdoor jobs.
- Trigger-start ignition avoids matches and separate spark lighters.
- 36-inch arm reduces bending during ground-level work.
- Adjustable flame knob gives you more control over heat output.
- Compact cylinder-mounted design is easy to carry and store.
Cons
- Propane cylinder is sold separately.
- Small-cylinder runtime is less suitable for large properties or long sessions.
- The cylinder must stay upright, and open-flame use is unsafe in windy, dry, or restricted conditions.
Is It Worth the Price?
The JT850 offers strong value when you need a portable outdoor torch for occasional home use. Its trigger ignition, adjustable brush flame, long arm, brass tip, and foam grip make it more convenient than a basic short torch for ground-level tasks.
You get the most value when your jobs are brief and spread around a small property. It is not the best fit if you need maximum heat, extended runtime, or a large-tank connection for clearing wide areas. Remember to include the cost of a compatible propane cylinder when comparing options.
How It Compares to Alternatives
The JT850 sits between a compact hand torch and a high-output hose-fed weed burner. Models such as the Flame King YSNPQ810CGA or larger-tank-compatible KOMAN torches may suit longer jobs, while the JT850 makes more sense when you value portability, a 36-inch reach, and a direct handheld-cylinder connection.
Compare fuel setup, output, hose requirements, ignition type, and local availability before deciding. A more powerful torch is not automatically better if it adds weight, setup time, or more heat than your work area can safely handle.
Frequently Asked Questions
What fuel does the Bernzomatic JT850 use?
Current Bernzomatic product information specifies 14.1-ounce or 16-ounce propane cylinders. Follow the label and manual supplied with your exact unit, even if an older retailer description mentions another fuel.
Does the JT850 include a propane cylinder?
No. The torch is sold without fuel, so you need to buy a compatible propane cylinder separately.
Can you use the JT850 indoors?
No. It is an outdoor torch that uses flammable fuel and produces combustion fumes. Use it only in a well-ventilated outdoor area away from flammable materials.
How do you light the JT850?
Open the control valve about one-quarter to one-half turn, point the burner away from your body and flammable objects, then press the ignition button. If it does not light, press the button again rather than using a match.
How should you use it on weeds?
Sweep the burner tip back and forth while keeping the flame about two inches above the ground, as directed in the manual. Avoid dry vegetation, mulch, wooden borders, windy weather, and any area covered by a burn restriction.
Can the JT850 melt ice on concrete?
Retailer descriptions mention ice melting, but the manufacturer manual warns that brick and concrete can crack or break under high heat. Avoid direct heating of those surfaces and choose a safer ice-removal method.
Why does the torch produce a large yellow flame?
A large yellow flame can occur when the propane cylinder is tilted too far and liquid fuel reaches the burner tip. Return the cylinder upright and turn the control knob off immediately.
How should you store the JT850?
Let the torch cool fully, disconnect the cylinder, and store the two items separately in a well-ventilated place. Keep them away from children, direct sun, and temperatures above 120°F.
The Bottom Line
The Bernzomatic JT850 is a practical choice for homeowners who need a portable 20,000 BTU outdoor torch with a long reach and quick trigger ignition. Buy it for controlled, short-duration jobs, but skip it if you need long runtime, indoor use, or a torch for large-scale clearing. Its convenience is real, but safe results depend on propane-only setup, upright operation, and careful fire control.
