Flame King 100LB (23 Gal) Steel Propane Tank Cylinder with P
✅ PROS
- True 100lb capacity (23.6 gallons water volume) — not a shaved-down '95lb' like some budget imports
- Heavy-duty 0.06-inch steel wall with welded foot ring; holds up to outdoor elements without rusting through
- Compatible with standard POL valve — no adapter needed for most residential regulators
❌ CONS
- Weighs 68 lbs empty — you'll need a hand truck or a strong back to move it when full (168 lbs total)
- No built-in gauge — you'll be guessing how much fuel remains unless you weigh it or buy a separate indicator
- Some units arrive with cosmetic scuffs from shipping; does not affect function but worth noting
The Verdict
The Flame King 100LB (23 Gal) Steel Propane Tank Cylinder with P — a 68-pound steel beast that holds roughly 23.6 gallons of propane, enough to run a 40,000 BTU patio heater for about 50 hours straight. That’s the headline. The question is whether this tank earns its keep in your backyard setup.
What You Actually Get
The box contains the tank itself — no regulator, no hose, no gauge. Just the cylinder with a standard POL valve (the left-hand thread type) and a protective collar that also serves as a lifting handle. The steel shell is 0.06 inches thick, which is noticeably beefier than the thin-walled aluminum tanks you’ll see at camping stores. The foot ring is welded, not crimped, so it won’t wobble on uneven patio stones.
One thing that stands out: the tank arrives with a plastic plug in the valve and a paint job that’s actually baked on, not just sprayed. That matters for outdoor storage in rain or snow — cheap tanks get surface rust within months; this one holds up.
Real-World Performance
The 100lb capacity is the whole story here. If you’re running a high-BTU patio heater, a fire pit table, or a grill that sees weekly use, a standard 20lb tank is a chore — you’re swapping it every couple of weekends. This tank eliminates that cycle. One buyer put it simply: “I hooked this up to my 50,000 BTU patio heater and got three full months of nightly use before I had to refill.” That’s the kind of feedback that shows up repeatedly in the 235 ratings.
The POL valve is a standard fit for most residential regulators — you won’t need an adapter for the vast majority of grill or heater setups. The tank holds pressure well; no reports of leaks at the valve stem or the welded seams in the review data.
Where It Falls Short
Honest talk: this tank is heavy. Empty, it’s 68 pounds. Filled, you’re hauling 168 pounds to the refill station. Unless you have a truck bed and a hand truck, you’ll be wrestling this thing. That’s a physical limitation of any 100lb tank, but it’s worth saying plainly.
Second, there’s no fuel gauge. You’ll be doing the “hot water trick” down the side of the tank to check levels, or buying an aftermarket gauge that screws into the POL valve. For the price point, a basic gauge would have been a nice inclusion.
Third, a few buyers noted shipping scuffs — the paint can get scratched in transit. It’s cosmetic, doesn’t affect function, but if you’re particular about aesthetics, it’s a minor ding.
Who Should Buy This
- Patio heater owners with high-BTU units who are tired of refilling 20lb tanks every week
- Backyard grillers who host regularly and want a fixed, large-capacity fuel source
- Off-grid or RV users who need a stationary propane supply for cooking or heating
- Restaurant or food-truck owners needing reliable bulk propane
Skip it if you only grill a few times a month — a 20lb tank is lighter, cheaper, and easier to manage. Also skip if you don’t have a vehicle that can safely transport a 168-pound filled tank.
FAQ
Q: Does this tank come with a regulator or hose? A: No. It’s just the cylinder with a POL valve. You’ll need to purchase a regulator and hose separately, which typically costs $15–$30.
Q: Can I get this refilled at any propane station? A: Yes, most refill stations handle 100lb tanks. They’ll weigh it and charge by the gallon. Exchange programs (like Blue Rhino) won’t take it — those are for 20lb tanks only.
Q: How long will a full tank last? A: At 40,000 BTU/hour, expect roughly 50–60 hours of continuous use. At 20,000 BTU (a typical fire pit), double that. Your actual mileage depends on your appliance’s efficiency.
The Verdict
Buy it if you need serious, long-running propane capacity for patio heating, grilling, or off-grid use. The build quality is solid, the capacity is real, and the 4.7-star rating from 235 buyers reflects consistent satisfaction.
Skip it if you’re a casual user or lack the physical means to move 168 pounds of filled steel. This isn’t a “set it and forget it” tank — it’s a “set it and forget it for three months” tank, which is exactly what some people need.
Rating: 4.6/5 — a heavyweight workhorse with one clear tradeoff: it’s heavy to handle, and you’ll wish it had a gauge. But for sustained propane demand, it’s one of the most reliable options on the market.
Where to Buy
We earn a small commission at no extra cost to you — this helps fund more honest reviews.
Last updated: 2026-08-06. Ratings and prices current as of review date. Verify on Amazon before purchasing.