Best 20 lb Propane Tanks and Where to Buy Them

The best 20 lb propane tank for most grill, RV, and outdoor cooking needs is the Flame King YSN-201 Steel Propane Tank with Type 1 OPD Valve. It’s a no-frills, DOT-compliant cylinder that works with standard exchange programs and refill stations. But the right choice shifts if you need a built-in fuel gauge, a floor-buffer shape for tight storage, or lower upfront cost — so read the trade-offs before clicking “buy.”

Quick answer

If you just want a reliable, exchangeable tank without extra features, get the Flame King YSN-201. It’s a standard 20 lb steel cylinder with the required OPD (Overfill Prevention Device) valve, and it supports both refills and exchanges at major retailers (Home Depot, Lowe’s, U-Haul, etc.). For a few dollars more, the Flame King YSN201BT adds a liquid-level gauge so you never guess how much fuel is left. The Flame King YSN230 also has a gauge but uses a slightly different valve configuration — check your appliance connection before buying.

Practical implication for your next purchase: If you plan to use the tank with a grill or fire pit and you swap empty tanks at a retail kiosk, the YSN-201 is the safest bet because exchange cages accept it without issue. If you intend to refill the same tank at a propane station and want to avoid mid-cookout empties, the gauge models (YSN201BT or YSN230) are worth the extra cost. Either way, buy new rather than reusing an old exchange tank — you start with a fresh recertification date and avoid unknown valve wear.

Comparison framework

Product	Brand	Rating	Features	Best For
Flame King YSN-201 20-Pound Steel Propane Tank Cylinder with Type 1 OPD Valve, White	Flame King	–	Standard OPD valve, no gauge	General grill/RV, exchange-friendly
Flame King YSN201BT 20LB Steel Floor Buffer Propane Tank Cylinder with Vapor Valve and Level Gauge, White	Flame King	–	Level gauge, floor-buffer shape	Storage where height is limited, need fuel monitoring
Flame King YSN230 20LB Steel Propane Tank Cylinder With Overflow Protection Device Valve and Built-in Gauge, Great For Grills And BBQs	Flame King	–	Built-in gauge, OPD valve	Grills/BBQs, visual fuel check

Top Pick: The Flame King YSN-201 20-Pound Steel Propane Tank Cylinder with Type 1 OPD Valve is the most versatile and widely available option. It’s the same form factor you’ll find at any exchange kiosk, so you can swap it easily if needed. If you’d rather avoid surprises, the YSN201BT (with gauge) adds convenience without sacrificing compatibility.

What changes the recommendation

The single biggest decision factor is whether you need a fuel gauge. If you use the tank for a single high-draw appliance (like a gas grill) and you’re disciplined about refilling before it runs empty mid-cook, skip the gauge and save money. If you run multiple devices (RV stove, heater, grill) or you hate lifting the tank to guess the weight, pay a little more for a model with a built-in gauge.

A secondary factor is physical footprint. The YSN201BT’s floor-buffer shape (shorter, wider base) fits better in tight vertical spaces like under an RV step or in a narrow storage compartment. The standard YSN-201 and YSN230 are taller and narrower.

Best-fit picks by use case

Standard grill or fire pit — Flame King YSN-201

This is the default choice. The YSN-201 uses the standard Type 1 OPD connection that fits almost all propane grills, patio heaters, and fire pits. No gauge means one less thing to break. If you exchange tanks at a supermarket or hardware store, this tank is identical to what you’ll get in the swap cage.

Checklist: Does this tank fit your setup?

• Does your appliance use a Type 1 (CGA-791) connection? (Almost all US grills do.)
• Do you plan to refill at a propane station or exchange at a retail kiosk? (Works for both.)
• Is the tank storage area at least 18 inches tall? (Standard height ~17.5 inches.)
• Is the tank DOT certified and less than 12 years old? (Check date stamp on collar.)
• Do you own a separate propane level indicator or are you okay lifting to check? (No gauge included.)

Concrete verification step: Before you buy, locate the date stamp on any used tank you currently own. It’s a two-digit month and two-digit year (e.g., “05 22” for May 2022) stamped into the steel collar. If that date is more than 12 years old, the tank cannot be refilled legally and exchange programs may reject it. Buying new (like the YSN-201) ensures you have a fresh 12-year clock.

Need a fuel gauge — Flame King YSN230 or YSN201BT

Both models have a built-in gauge, but the YSN230 uses a different valve assembly. Confirm your regulator matches the Type 1 connection before purchase — the YSN230 is still a Type 1 OPD, but some users report a tighter fit with certain grill hoses. The YSN201BT has a more traditional valve and adds the floor-buffer shape.

Expert tip: If you go with a gauge model, check the gauge’s accuracy by weight after your first fill. Common mistake: assuming the gauge reads “full” at the same point every time — it can be off by 10–15%. Calibrate by weighing the tank empty (usually ~17 lb tare weight stamped on the collar) and subtract from full weight.

Expert tip: When attaching the regulator, hand-tighten the nut only. Overtightening with a wrench can crack the OPD valve or deform the gasket, causing a slow leak. If you smell gas after connection, shut the valve and apply a leak-detection solution (soapy water) — bubbles mean you need to tighten or replace the gasket.

Tight storage or RV use — Flame King YSN201BT

The YSN201BT’s shorter, wider design (floor-buffer shape) makes it easier to stow under counters or in compartments where a standard cylinder won’t stand up. The gauge is also handy for RV trips where you might not want to pull the tank out just to check fuel level.

Expert tip: Secure the tank during travel. Use a tie-down or a dedicated propane tank holder. Common mistake: letting the tank slide or tip over — this can damage the valve or regulator, and a damaged valve may not seal properly even when closed.

Trade-offs to know

• Steel vs. aluminum: All three Flame King tanks here are steel. Steel is heavier (about 30 lb full) but cheaper and easier to exchange. Aluminum tanks are lighter but cost roughly double and are rarely accepted in exchange programs.
• Gauge cost vs. convenience: The YSN-201 (no gauge) is typically $10–15 cheaper than the gauge-equipped models. The gauge models add a moving part that can eventually fail. For most users, the convenience outweighs the small extra cost.
• Exchange program compatibility: Standard 20 lb cylinders (like the YSN-201) are accepted by almost all exchange kiosks. Tanks with unusual shapes or valve placements (like some floor-buffer models) may not fit the exchange cage. Confirm with your local exchange provider if you plan to swap rather than refill.
• Freshness: Tank exchange programs recycle old cylinders. Buying a new tank like the Flame King ensures you start with a clean, recent manufacture date. Always note the date stamp — a tank is only good for 12 years from that date, after which it must be recertified or replaced.

Realistic mismatch scenario: If you buy the Flame King YSN230 for a grill with a fixed low-clearance enclosure (e.g., some built-in outdoor kitchens), the built-in gauge protrudes slightly from the valve collar. In very tight cabinets, that extra 1–2 inches can prevent the tank from sitting upright. Measure your storage compartment’s interior height and depth before choosing a gauge model — the YSN230 is about 17.7 inches tall to the top of the gauge, while the YSN-201 is about 17.2 inches.

Expert tip: When you buy a new tank, write the purchase date on the collar with a permanent marker. Common mistake: forgetting the date and later being denied a refill because the tank is out of date.

Related questions

Can I exchange a 20 lb propane tank at Home Depot or Lowe’s?
Yes, both stores accept any standard 20 lb steel cylinder with an OPD valve for exchange, including the Flame King YSN-201. They charge around $20 for a swap.

How long does a 20 lb propane tank last?
A 20 lb tank holds 4.7 gallons of propane. A typical gas grill on high burns about 1 lb per hour, so you get roughly 20 hours of grilling time. A 30,000 BTU propane heater will run about 10–12 hours. Actual duration depends on your appliance’s BTU rating.

Do I need a special regulator for a tank with a gauge?
No. All three Flame King tanks use the standard Type 1 connection, so they work with any grill or appliance that accepts a 20 lb tank. The gauge is built into the valve body and does not affect the regulator or hose compatibility.