Flame King Review 2026: Refillable Propane Cylinders and Tanks

Flame King is a US propane brand that makes everything from refillable one-pound camping cylinders to large steel and ASME tanks, plus heaters, weed burners, kitchen torches, regulators and gauges. This Flame King review focuses on what most buyers come for, the refillable one-pound cylinder and the larger steel tanks, and covers how refilling works, what it costs, the safety rules that matter, and where the brand falls short.

Our verdict in brief

Flame King is a sensible choice for campers, grillers and RV owners who go through a lot of one-pound propane bottles and want to stop throwing them away, and for homeowners who need a solid steel tank at a fair price. Its refill kit is the standout: reviewers find it simple and safe when you follow the instructions, and it cuts the cost per bottle sharply. The trade-offs are a learning curve, the need for a twenty-pound tank at home, occasional fitting mismatches, and the fact that refilling propane always demands care.

How we researched this review

Simple Life Reviews did not buy or refill Flame King cylinders. We read AmazingRibs' detailed review of the cylinder refill kit, a brand summary from MyProsAndCons, and a Coupontigo overview, and checked Flame King's own site for its product range and safety guidance. MyProsAndCons shows no user reviews of its own and Coupontigo is a coupon site, so we lean most on AmazingRibs, whose reviewer used the kit, and we attribute that experience to them.

What is Flame King?

The Flame King website organizes the range into tanks, backyard tools such as propane weed burners, accessories like regulators, gauges, racks and fittings, heaters, kitchen torches and camping gear. Its catalog runs from a 1 lb Refillable Propane Cylinder Kit with Adapter & Stand and a 4 pack of 1lb refillable cylinders up to a 30lb tank with OPD and gauge, 100lb cylinders and a 420lb, 120 gallon ASME tank with float gauge.

The brand's environmental pitch centers on the refillable one-pound tank, which Flame King calls the first of its kind. That matters because standard one-pound camping bottles are single-use.

The refillable 1 lb cylinder: why it matters

AmazingRibs lays out the problem well: single-use "DOT 39" one-pound bottles, Coleman's among them, run $6 to $9 apiece, while refilling a cylinder designed for it costs only $1 to $2. It also cites Waste Advantage Magazine's estimate that 40 million cylinders are sold each year, and notes that many towns forbid putting them in the trash or recycling.

That is the case for Flame King in one paragraph. If you run a camp stove, lantern, portable heater or searing torch on one-pound bottles, a refillable cylinder pays for itself after a handful of fills and keeps empties out of the landfill.

Flame King 1 lb Refillable Propane Cylinder Kit with Adapter & Stand

The kit is the core product. AmazingRibs describes a stand for a 20-pound tank, the EZ-Fill adapter and one refillable one-pound cylinder, with the stand assembled from two legs, a bolt and wingnut, and a plastic base held by four more bolts. Flame King, it reports, presents this as the only legal method for refilling one-pound cylinders and says it is DOT compliant.

Extra cylinders are sold singly or in pairs. The same AmazingRibs review says empty cylinders should cost less than $20 each, and warns that some sites ask $49 or more for a single cylinder, so compare before you buy.

How refilling works, step by step

The process is simple once you have done it, but it must be done carefully. Based on the AmazingRibs walk-through and Flame King's instructions:

• Work outside in an open, ventilated spot, away from flames, sparks and cigarettes.
• Set the stand on firm ground and turn the twenty-pound tank upside down on it, with the valve between two legs.
• Screw the EZ-Fill adapter and the one-pound cylinder onto the tank valve, hand tight.
• Open the big tank's valve and listen for leaks; tighten fittings if you hear any.
• Use the supplied hex wrench to open the small vent on the cylinder, which lets trapped gas escape so liquid propane can fill it.
• Close everything, remove the cylinder and weigh it to confirm the fill.

AmazingRibs adds two numbers worth remembering: Flame King warns not to leave the 20-pound tank inverted for more than 10 minutes, and a cylinder should weigh 1.4 lbs empty and about 2.5 lbs full. A kitchen scale is the easiest way to check you have not overfilled.

Are there safety concerns with refilling small propane cylinders?

Yes, and they are the most important part of this review. AmazingRibs quotes the US Department of Transportation warning that disposable DOT 39 cylinders should never be refilled because they are not built for it, and that refilled DOT 39 bottles have been involved in hazmat incidents, one of them fatal.

The key distinction: Flame King's refillable cylinders are made to be refilled; the green disposable bottles are not. Never use a refill adapter on a disposable bottle. Flame King's own site also publishes guidance on the 80% filling rule, which leaves room for propane to expand as it warms. Overfilling is the main hazard, which is why the vent step and the weight check matter.

MyProsAndCons makes the same point: a refill done carelessly risks overfilling or damaging the cylinder. If you are not comfortable with these steps, buying pre-filled cylinders from a propane dealer is the safer route.

Larger tanks and heaters

Flame King 100lb Empty Propane Tank LP Cylinder with POL Valve

For heating, generators or long RV trips, the larger steel tanks are the other big seller. MyProsAndCons describes the 100lb steel tank as having a wider base for stability, an oversized valve handle and a collared POL valve, priced at $229.95 and averaging 4.7 stars across more than 340 ratings. Tanks this size ship empty, so budget for the first fill at a propane dealer.

At the top of the range, the largest ASME tank, with a float gauge and lid, is for permanent home or commercial storage and usually needs professional installation.

What operational limits exist for Flame King propane heaters?

MyProsAndCons puts Flame King's heaters in the 10,000 to 20,000 BTU range, suited to garages and patios but potentially too weak for large or poorly insulated spaces. Measure the space and check the BTU rating before buying, and follow the ventilation rules for any heater you use indoors.

Prices

Prices vary by retailer, and none of our sources states Flame King's warranty length, return window or trial terms. Check those with the seller before buying a large tank, since returning a heavy cylinder can be awkward.

Can Flame King tanks fit all standard propane equipment?

Mostly. Coupontigo says the products work with camping stoves, grills, heaters, fire pits and weed torches, and the one-pound cylinders use the same thread as disposable bottles. However, MyProsAndCons flags occasional valve fitting mismatches, along with shipping and refilling logistics problems, as the brand's main trade-offs. Check the valve type, such as POL or OPD, against your appliance or regulator before ordering.

Why might some customers face issues with Flame King tanks?

The issues reported in our sources come from three places: fittings that do not match a particular appliance, shipping problems with large tanks, and refilling mistakes. The last one is the user's responsibility, but it is easy to get wrong the first time. Practice the refill steps with the instructions open, and do not rush.

Pros and cons

Pros

• Refillable one-pound cylinders cut the cost per fill to a fraction of a disposable bottle
• Less waste than single-use camping cylinders
• Simple refill kit with stand, adapter and vent wrench
• Wide range, from camping cylinders to hundred-pound and ASME tanks
• Steel tanks praised for build quality and value

Cons

• Refilling carries real risk if done carelessly
• You need a twenty-pound tank and a little practice to refill
• Upfront kit cost is higher than a few disposable bottles
• Occasional valve fitting mismatches and shipping problems
• Warranty and return terms are not clearly published in our sources

Who should buy Flame King, and who should skip it

Buy if you camp, tailgate or cook outdoors often enough to go through many one-pound bottles, already own a twenty-pound grill tank, and are comfortable following safety steps exactly. RV owners and homeowners who need a well-built thirty-pound or hundred-pound tank are also a good fit.

Skip it if you only use a one-pound bottle once or twice a year, you would rather not handle liquid propane yourself, or you need a heater for a large, cold space. In those cases, buying filled cylinders or a larger heater from a local dealer makes more sense.

Alternatives

The main alternative to Flame King's refill system is simply buying disposable one-pound cylinders from brands such as Coleman, which AmazingRibs prices at several dollars each. They are convenient and need no equipment, but cost more over time and create waste. For large tanks, a local propane dealer's exchange or lease program avoids buying the tank at all.

If you buy outdoor gear online, our UtahSkis review covers how to check whether a gear retailer is legit before you order.

Where to buy Flame King

Flame King sells through its own website and through major retailers and marketplaces. Compare the same model across sellers, watch for inflated prices on single cylinders, and check the seller's return policy for heavy tanks.

Our ratings

Overall: 3.5/5, because AmazingRibs finds the refill system simple, legal and far cheaper than disposable bottles, while MyProsAndCons notes fitting mismatches and shipping issues and no source documents the warranty.

Flame King 1 lb Refillable Propane Cylinder Kit with Adapter & Stand: 4/5, because AmazingRibs describes a straightforward kit that cuts refill costs sharply, as long as you follow the safety steps.

Flame King 100lb Empty Propane Tank LP Cylinder with POL Valve: 3.5/5, because MyProsAndCons reports a well-rated, stable steel tank at a fair price, though it ships empty and large tanks bring shipping hassles.

FAQ

What is Flame King?

It is a US brand of propane products: refillable one-pound cylinders and refill kits, steel tanks up to large ASME sizes, heaters, weed burners, kitchen torches and fittings. It is best known for its refillable one-pound cylinder.

What makes Flame King propane tanks reliable?

Reviewers point to steel construction, safety valves such as OPD and POL fittings, and stable designs like the wide-based hundred-pound tank. The refillable cylinders are built for repeated filling, unlike disposable bottles.

How do refillable 1 lb cylinders work and compare?

You invert a twenty-pound tank on a stand, connect the refillable cylinder through an adapter, vent it to let liquid propane in, then weigh it. Compared with disposable bottles, each refill costs far less and creates no throwaway canister.

Are there safety concerns with refilling small propane cylinders?

Yes. Never refill disposable camping bottles, only cylinders made for refilling. Work outdoors away from flames, avoid overfilling, check the weight after each fill and follow Flame King's instructions exactly.

Can Flame King tanks fit all standard propane equipment?

Most standard appliances work, but some buyers report valve fitting mismatches. Match the valve type and connector to your appliance or regulator before you buy.

Who should consider Flame King propane tanks unsuitable?

Occasional users who go through very few cylinders, anyone uncomfortable handling liquid propane, and people needing heat for large spaces may be better served by filled cylinders or bigger heaters from a dealer.

Where can I buy Flame King products?

From Flame King's own website and from large retailers and online marketplaces. Prices for single cylinders vary widely, so compare sellers before ordering.