Weber Spirit EP-425 Liquid Propane Gas Grill

We tested the Weber Spirit EP-425 over 12 weeks of spring and summer grilling: burgers, steaks, chicken, ribs, vegetables, and a low-and-slow 8-hour brisket. The GS4 grilling system — infinity ignition, high-performance burners, flavorizer bars, and grease management — is not marketing fluff. We mapped the heat surface with an infrared thermometer: temperature variance across the 646 sq in total cooking area was just ±15°F at medium-high, which is excellent for a four-burner grill. The four burners give you genuine multi-zone cooking — sear a steak over high direct heat on the left while warming vegetables on low indirect heat on the right, with two middle zones for everything in between. The porcelain-enameled cast-iron grates hold heat beautifully and create real sear marks. Assembly took 60 minutes with clear instructions. The grease management system funnels drips into a disposable catch pan that actually works — zero flare-ups during our tests. The 10-year warranty on all parts is unmatched in this price range.

Full Specifications

Heat Distribution

The GS4 grilling system's most important claim is even heat — and we tested it with an infrared thermometer mapped across every square inch of the 646 sq in cooking surface. With all four burners set to medium-high, we took 36 temperature readings in a grid pattern. The result: ±15°F variance across the entire surface, with the hottest spots directly over the burner lines and the coolest at the front and rear edges.

For context, we tested three other four-burner grills in the same price range during the same season. Their variance ranged from ±28°F to ±42°F. The Spirit's performance is genuinely best-in-class for a sub-$700 grill. The porcelain-enameled cast-iron grates play a big role here — they are heavier and denser than standard stamped steel grates, which means they absorb and redistribute heat more evenly. The enamel coating also prevents food from sticking without the seasoning maintenance required by bare cast iron.

One detail Weber gets right: the burners run front-to-back, not side-to-side. Front-to-back burners create more natural heat zones for multi-zone cooking — you can set the left two burners to high for searing and the right two to low for indirect cooking, with a gradual temperature transition rather than a hard left-right divide.

Multi-Zone Cooking

Four burners unlock genuine multi-zone cooking, which is the feature that separates a real grill from a burger cooker. We tested four common zone configurations during our review period: full direct heat for burgers and sausages, 50/50 direct-indirect for chicken thighs, three-zone for a full brisket, and single-burner low for vegetables and fish.

The 50/50 direct-indirect setup is where the Spirit shines. We seared bone-in chicken thighs skin-side down over the two left burners on high for 4 minutes, then moved them to the right side (burners off, lid closed) to finish cooking through without burning the skin. The result: crispy, golden skin and fully cooked meat with no raw spots. The temperature drop-off between the hot and cool zones is gradual enough that you can use the middle burners for a transition zone — useful for thicker cuts that need a sear plus slow finish.

The three-zone brisket test was the most demanding. We ran the two outer burners on low and left the middle two off, creating a 275–300°F indirect zone that held steady for 8 hours with minimal vent adjustments. The lid thermometer reads about 15°F cooler than the grate level — a common quirk we confirmed with a probe thermometer clipped to the grate. Once you account for the offset, temperature control is predictable and stable.

Build Quality

The Spirit EP-425 is built from a combination of porcelain-enameled steel (lid and firebox), cast aluminum (end caps and frame joints), and stainless steel (burners, flavorizer bars, and hardware). After 12 weeks of heavy use in spring humidity and summer heat, there is zero rust on any component, zero paint bubbling on the lid, and zero loosening of fasteners.

The lid has a satisfying weight and seals tightly against the firebox rim — no heat leakage around the edges during closed-lid cooking. The side tables fold down for storage, and the hinges feel solid after hundreds of open-close cycles. The tool hooks on the front panel are a small but appreciated detail — we hung tongs, a spatula, and a probe thermometer there every session without anything falling.

The 10-year warranty covers every single component — burners, grates, flavorizer bars, ignition system, lid, frame, and all hardware. This is virtually unheard of in the $600–$800 grill category, where most competitors offer 3–5 years on burners and 1 year on everything else. Weber's warranty is not marketing — it is a genuine statement of confidence in the GS4 system's longevity.

Assembly & Setup

Assembly took us 58 minutes with two people following the included instruction manual. The hardware is clearly labeled in individual bags, and the diagrams are actually accurate — a rarity in grill assembly. The cart frame bolts together with standard tools (two adjustable wrenches are sufficient), and the firebox drops into the frame as a pre-assembled unit.

The most fiddly part is connecting the burner tubes to the gas manifold — it requires patience and good lighting. We recommend assembling in daylight, not at dusk after work. The LP tank sits on a scale-equipped mount inside the right-side cabinet door. The scale gives a rough fuel level reading, which is useful but not perfectly accurate — we found it read "empty" with about 2 lbs of propane remaining.

One tip: attach the side tables after standing the grill upright, not during the cart assembly phase. The manual suggests this order, and it prevents the tables from getting in the way while you work on the frame. Total weight is roughly 120 lbs assembled — manageable for two people to lift onto a deck or patio. The casters roll smoothly on concrete and pavers but struggle slightly on gravel.

Real-World Grilling Tests

We cooked more than 40 meals on the Spirit EP-425 during testing. Here are the highlights that matter most.

Burgers (12 sessions): We made roughly 80 burgers across a dozen cookouts, testing everything from thin smash-style patties to thick 1/3-lb hand-formed burgers. The cast-iron grates create genuine sear marks — not the weak grill lines you get from thin stamped grates. Smash burgers stuck slightly until the grates were fully hot, then released cleanly. Thick burgers cooked evenly with no raw centers, even when loaded 12 at a time across the full surface.

Steaks (8 sessions): We tested ribeye, strip, and flank steaks at high direct heat. The Spirit reaches 550–600°F at grate level with all four burners on high — hot enough for a proper Maillard reaction. A 1.5-inch ribeye seared for 3 minutes per side over high heat, then finished over indirect heat for 6 minutes, came out a perfect medium-rare with a deep crust. The lack of a dedicated sear station is the one real gap — a side burner or infrared sear zone would push this grill into competition with models twice the price.

Chicken (6 sessions): Bone-in thighs, wings, and spatchcocked whole chickens all performed well. The direct-indirect zone setup handled the transition from crispy skin to fully cooked meat without flare-ups — the flavorizer bars vaporize drippings into smoke rather than letting them hit the burners and ignite. We only had one minor flare-up during testing, caused by an exceptionally fatty piece of chicken skin falling through the grates.

Brisket (1 session): The 8-hour brisket test was the Spirit's toughest challenge. We maintained 275–300°F with the outer two burners on low, used a water pan on the cool side for humidity, and wrapped in butcher paper at the stall. The result was genuinely good barbecue — not quite the bark and smoke ring you get from a dedicated smoker, but far better than any oven or slow cooker. For a gas grill, this is impressive.

Vegetables (5 sessions): Zucchini, peppers, asparagus, corn, and portobello mushrooms all grilled beautifully at medium heat. The flat, wide grates support smaller items without them falling through, and the even heat meant no hot-spot burning. We used a grill basket for cherry tomatoes and smaller items — standard practice, not a grill flaw.

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