Gas Grill Buying Guide: Features, Fuel, and Performance

When it’s time to upgrade your backyard cooking or buy your first grill, understanding how to choose a gas grill is key to getting reliable, convenient performance. Unlike charcoal, gas grills offer instant heat and precise control, but their design and features vary widely. This guide walks you through the core elements—heat output, burner configuration, construction, and fuel type—so you can select a grill that delivers consistent results for years of cooking.

Understanding BTU and Heat Output

BTU, or British Thermal Unit, is a measure of a grill’s maximum heat output per hour. While a higher total BTU number suggests more power, it doesn’t tell the whole story about cooking performance. A grill with a very high BTU but poor construction might just burn fuel inefficiently. More important is the BTU per square inch of cooking area. A good target is a balanced output that can reach and maintain high searing temperatures (often above 500°F) without struggling, while also holding a steady low temperature for indirect cooking.

Consider what you cook most. If you primarily sear steaks or need quick preheat, sufficient BTU is crucial. For slower roasting or smoking, a grill’s ability to maintain a stable lower temperature is more valuable than its maximum blast. The best indicator is often the grill’s design and materials, which help retain and distribute that heat effectively.

Burner Configuration and Heat Distribution

How the burners are arranged under the cooking grates is critical for even cooking. A common setup is two or three tube burners running front-to-back. This can create hotter and cooler zones across the grill, which is useful for two-zone cooking (direct and indirect heat). Some grills use more burners, an H-shaped pattern, or a center burner to help minimize cold spots.

Look for features that aid in spreading the heat evenly. Radiant heat diffusers—metal plates, bars, or lava rocks above the burners—help protect the burners from drips and disperse the flame’s heat more uniformly across the cooking surface. The quality and coverage of these diffusers significantly impact how evenly your food cooks, preventing one side from being charred while the other is underdone.

Construction Materials and Durability

The materials used in a grill’s body, lid, cooking grates, and burners determine its longevity and ability to hold heat. Here’s a breakdown of common materials:

Heavier, thicker materials generally indicate better heat retention and durability. Pay attention to the warranty, especially on burners and rust-through on the firebox, as it reflects the manufacturer’s confidence in the construction.

Natural Gas vs. Propane

One of the first decisions in how to choose a gas grill is selecting your fuel source: propane tanks or a permanent natural gas line. Each has distinct advantages.

Propane (LP) Grills: These are the most common and portable. They use standard 20-lb tanks you can exchange or refill. The main consideration is monitoring fuel levels—running out mid-cook is a classic pitfall. Propane burns slightly hotter than natural gas, but the practical difference for most cooking is minimal.

Natural Gas (NG) Grills: These connect directly to your home’s gas line via a quick-disconnect fitting. The key benefit is an endless fuel supply—no more tank runs or surprises. The installation must be performed by a qualified professional to ensure it’s safe and meets local codes. Natural gas grills often cost a bit more upfront and are not portable.

It’s crucial to buy a grill designed for your specific fuel. Converting a grill from one fuel type to the other requires a certified conversion kit and should be done by a professional to ensure proper gas pressure and safe operation.

Essential Features for Consistent Cooking

Beyond the core mechanics, several features contribute to a better cooking experience and consistent results.

• Side Burners: A separate burner on the side provides a dedicated space for simmering sauces, boiling corn, or sautéing vegetables without taking up grill space.
• Integrated Thermometer: A reliable lid thermometer gives you a general reading of the grill’s ambient temperature, which is vital for managing indirect cooks. Remember, it measures air temperature at the top of the lid, not at grate level.
• Warming Rack: A shelf above the main cooking area keeps finished food warm without overcooking it.
• Storage & Mobility: Cabinets or shelves offer convenient storage for tools and tanks. Wheels, preferably at least two with locks, are essential for moving the grill for cleaning or repositioning.

Think about which of these add-ons align with your cooking style. A side burner is great for ambitious cooks, while a sturdy cart and storage might be more practical for everyday use.

FAQ

How many BTUs do I really need?

There’s no single perfect number. A common guideline is to look for roughly 80 to 100 BTUs per square inch of primary cooking space. For example, a 500-square-inch grill might have 40,000 to 50,000 total BTUs. This ratio helps ensure the grill has enough power to heat its surface adequately. Ultimately, a well-built grill that maintains stable temperatures is more important than chasing the highest BTU rating.

Is stainless steel always better?

Not necessarily. High-quality, thick-grade stainless steel is excellent for resisting rust and lasting for years. However, some “stainless steel” grills use thin stainless on exterior panels while critical internal components are lower-grade materials. Look for information on the grade and thickness of the stainless used, especially for the firebox, burners, and grates. A full-stainless construction is typically a sign of a higher-end, durable grill.

Can I use a natural gas grill with a propane tank?

No, you cannot simply hook a propane tank to a natural gas grill. The orifices that deliver gas to the burners are sized differently for each fuel due to differing gas pressures. Using the wrong fuel can be extremely dangerous, leading to uncontrolled flames or gas leaks. If you need to switch fuel types, you must use a manufacturer-approved conversion kit and have the conversion performed by a professional technician.

What’s more important: burner count or burner layout?

Layout is generally more important than sheer count. Two or three well-positioned burners with good heat diffusers can provide excellent control and even heating. More burners can offer finer temperature zoning but also add complexity and potential points of failure. Focus on how the layout allows you to create distinct heat zones for the types of cooking you do most, like a hot zone for searing and a cooler zone for roasting.

How do I maintain even heat on a gas grill?

Start by preheating the grill with all burners on high for 10-15 minutes to allow the entire cooking box and grates to come up to temperature. Use your lid thermometer as a guide, but verify grate-level temps with an oven thermometer placed on the grates. Clean the heat diffusers and burners regularly to prevent clogs that cause uneven flames. If you notice persistent cold spots, use them for delicate items and keep the hottest areas for searing.

Choosing the right gas grill comes down to matching its performance features—heat control, even distribution, and solid construction—to your cooking habits and fuel setup. By focusing on these fundamentals, you’ll find a grill that becomes a reliable partner for countless backyard meals. For a broader comparison of grill types, see our overview on how to choose the right grill, or explore our guide for selecting a charcoal grill if you’re considering other options.