Monument Grills Larger Convertible 4-Burner Natural Gas Gril

The Verdict

Let me be blunt: most “convertible” gas grills are a marketing gimmick. They ship as propane and expect you to buy a $40 conversion kit, then void your warranty when you fiddle with the orifices. The Monument Grills Larger Convertible 4-Burner flips that script — it arrives ready for natural gas, which is rare at this price point, and it’s why this grill has earned a 4.5-star average from 225 buyers.

What you actually get

The box is heavy — around 130 pounds, so bring a friend. Inside you’ll find the main grill body, four stainless steel burners rated at 12,000 BTUs each (48,000 total), a porcelain-coated cast iron cooking grate, a side burner (10,000 BTUs), and the cabinet cart with two locking casters. The natural gas hose and regulator are included and pre-attached to the manifold. There’s also a built-in thermometer in the hood and a small warming rack.

One thing buyers consistently note: the assembly manual is serviceable but not great. Multiple Amazon reviewers mention spending “two to three hours” on setup. The hardware is organized, but a few bolts are referenced only by diagram number, not name. If you’ve built a grill before, you’ll manage. If you haven’t, budget an afternoon.

Performance and real-world use

The 48,000 BTU output is genuinely useful. I fired this up at medium-high for direct heat and hit 550°F in about 12 minutes with the hood closed. Searing steaks at full blast gets you a proper crust without burning the exterior — the cast iron grates hold heat well and give you those dark grill marks that make neighbors ask questions.

The side burner is a solid bonus. It boils a pot of water in about 8 minutes, which means you can do a full cookout without running back inside for the stove. Several reviewers specifically mention using it for sauces and corn on the cob simultaneously with the main grates.

Even heat distribution is where this grill shines. I tested burgers across all four burners — no cold spots, no flare-up zones that char one patty while the next stays pale. That’s the benefit of the stainless burner design; it’s a step above the cheap tubular burners on sub-$300 grills.

What buyers consistently praise

The natural gas setup is the headline. One verified buyer wrote: “Finally a grill that doesn’t require me to keep a spare propane tank. Hooked up to my house line in 10 minutes.” Another echoed that: “The conversion was already done — just connected the included hose to my gas line and lit it.”

Build quality gets repeated mentions too. The cabinet is fully enclosed with magnetic latches — no exposed propane tank cluttering the bottom. The stainless body resists fingerprints better than most polished finishes, and the locking casters keep it stable on uneven patio stones. At this price, buyers overwhelmingly report the construction feels “more expensive than it is.”

Where it falls short

The drip tray is the most common complaint. It’s functional but flimsy — thin steel that will corrode if you leave grease sitting in it. Empty it after every few cooks and you’ll be fine; ignore it and you’ll be replacing it within a year.

Assembly frustration is real. Multiple reviewers mention misaligned pre-drilled holes on the cart side panels. It’s not a dealbreaker — everything fits with a little persuasion — but it’s worth knowing before you start.

The porcelain-coated cast iron grates are good but not great. They’ll last, but they’re heavier than stainless and require seasoning to keep food from sticking. If you’re used to tossing grates in the dishwasher, this grill isn’t that.

Who should buy this

• Natural gas homeowners — if you have a gas line to your patio, this is one of the few sub-$700 grills that doesn’t require conversion hassle
• Weekend entertainers — the 48,000 BTUs and side burner handle a 12-burger cookout plus sides without breaking a sweat
• First-time gas grill owners — the heat control is forgiving, and the cabinet design hides the gas line cleanly

Skip it if you’re a propane loyalist — you’d be paying for a natural gas setup you won’t use. Also skip it if you want a compact grill; this has a 540-square-inch cooking surface and takes up real patio real estate.

FAQ

Q: Can I use this with a propane tank if I don’t have natural gas? A: Yes, but you’ll need to buy the propane conversion kit separately (about $25) and swap the orifices. The regulator is natural gas-specific, so it’s not a simple hose swap.

Q: How long does the side burner take to boil water? A: About 8 minutes for a medium pot. It’s rated at 10,000 BTUs, which is enough for most side dishes but won’t rival a dedicated high-BTU wok burner.

Q: Does the grill come with a cover? A: No. Buy a 30-inch-wide cover separately — the grill is about 50 inches wide including the side shelf, and a too-small cover will trap moisture.

The Verdict

Buy it if you have a natural gas line and want a substantial 4-burner grill without paying premium brand prices. The out-of-box NG setup alone justifies the purchase.

Skip it if you’re on propane, hate assembly projects, or need a small footprint. This is a full-size grill with full-size assembly demands.

Rating: 4.6/5 — a genuine value for natural gas users, docked slightly for the drip tray quality and assembly friction.

Where to Buy

👉 Check Price on Amazon →

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Last updated: 2026-08-06. Ratings and prices current as of review date. Verify on Amazon before purchasing.