You can turn your grill into a full outdoor kitchen with a side burner that sears steaks, simmers sauces, and handles a quick stir-fry. You’ll want strong BTUs, steady flames in the wind, and 304 stainless steel that won’t quit after a few seasons. Fuel choice matters too—propane, natural gas, or a convertible kit can change everything. Next, you’ll see which five burners actually earn their space.
| Stanbroil Built-in Single Side Burner (Propane Only) |  | Best Built-In Single | Burner Count: Single burner | Total BTU: 12,000 BTU | Fuel Type: Propane only | VIEW LATEST PRICE | Read Our Analysis |
| Double Side Burners for Outdoor Kitchen (15,000 BTU) |  | Best for Versatility | Burner Count: Double burner | Total BTU: 30,000 BTU (2×15,000) | Fuel Type: LP/NG convertible (LP default) | VIEW LATEST PRICE | Read Our Analysis |
| Double Side Burners for Outdoor Kitchen (15,000BTU) |  | Best for Natural Gas | Burner Count: Double burner | Total BTU: 30,000 BTU (2×15,000) | Fuel Type: LP/NG convertible (NG default) | VIEW LATEST PRICE | Read Our Analysis |
| Lion Premium Grills L5631 Natural Gas Side Burner |  | Professional-Grade Pick | Burner Count: Single burner | Total BTU: 15,000 BTU | Fuel Type: Natural gas | VIEW LATEST PRICE | Read Our Analysis |
| VEVOR Double Grilling Side Burners 17,000BTU (2-Pack) |  | Highest Heat Output | Burner Count: Double burner | Total BTU: 34,000 BTU (2×17,000) | Fuel Type: LP/NG convertible (LP default) | VIEW LATEST PRICE | Read Our Analysis |
More Details on Our Top Picks
Stanbroil Built-in Single Side Burner (Propane Only)
Should you want a built-in side burner that can handle year-round outdoor use and still deliver strong heat for sauces, sides, or quick sears, the Stanbroil Built-in Single Side Burner is a smart pick—especially since its food-grade 304 stainless steel construction resists rust and weather. You get a 12,000 BTU cast brass burner that sears fast, simmers steadily, and frees up space on your main grill. It runs on liquid propane only, so don’t expect natural gas compatibility. The upgraded knob won’t block lid closure, and the removable lid and grid simplify protection and cleanup. Cutout: 11” x 19” x 5.9”.
- Burner Count:Single burner
- Total BTU:12,000 BTU
- Fuel Type:Propane only
- Main Material:304 stainless steel
- Cover/Lid:Removable lid
- Cutout Size:11″×19″×5.9″
- Additional Feature:Cast brass burner
- Additional Feature:Removable cooking grid
- Additional Feature:Easy-operate knob
Double Side Burners for Outdoor Kitchen (15,000 BTU)
In case you cook outdoors for a crowd and need real stove-like power alongside your grill, a double side burner with two 15,000 BTU cast-iron burners gives you fast boils and steady heat for big pots—without flames blowing out in the wind thanks to the deep-mounted design. You get food-grade 304 stainless steel that resists corrosion and holds up season after season. It ships set up for LP, but you can switch to NG with the included conversion kit. The 25 x 14 x 12.4-inch unit fits a 20.5 x 12.8 x 9.25-inch cutout, while the drip tray, lid, and grate simplify cleanup. LED-lit knobs help at night, backed by lifetime support.
- Burner Count:Double burner
- Total BTU:30,000 BTU (2×15,000)
- Fuel Type:LP/NG convertible (LP default)
- Main Material:304 stainless steel
- Cover/Lid:Lid included
- Cutout Size:20.5″×12.8″×9.25″
- Additional Feature:Deep-mounted cast iron
- Additional Feature:Removable drip tray
- Additional Feature:LED knob lighting
Double Side Burners for Outdoor Kitchen (15,000BTU)
Built for outdoor cooks who need serious stove power beside the grill, this double side burner pairs two 15,000 BTU cast-iron burners with a deep-set design that helps keep flames steady even as the wind kicks up. You get fast boils for stockpots and strong sears in a premium 304 stainless-steel body that resists corrosion. It ships with a natural-gas nozzle plus an LP conversion kit, so you can match your setup. At 25 x 14 x 12.4 inches, it drops into a 20.5 x 12.8 x 9.25 cutout. Removable trays, lids, and grates clean easily, and LED knobs guide night cooks. Lifetime support’s included.
- Burner Count:Double burner
- Total BTU:30,000 BTU (2×15,000)
- Fuel Type:LP/NG convertible (NG default)
- Main Material:304 stainless steel
- Cover/Lid:Lid included
- Cutout Size:20.5″×12.8″×9.25″
- Additional Feature:Deep-mounted cast iron
- Additional Feature:Removable drip trays
- Additional Feature:Includes LP conversion
Lion Premium Grills L5631 Natural Gas Side Burner
Outdoor cooks who already run a natural gas line and want a clean, built-in way to expand beyond the main grill will appreciate the Lion Premium Grills L5631: its 15,000 BTU output delivers dependable heat for sautéing sauces or boiling sides, while the stainless-steel construction and protective cover keep it looking sharp in a busy outdoor kitchen. You’ll get a single, 20-1/2 across 12-1/2-inch burner that drops into your island for a seamless, pro look. Flip in the convertible grate whenever you desire wok-style stir-fries, then cover it up among cooks to protect the finish.
- Burner Count:Single burner
- Total BTU:15,000 BTU
- Fuel Type:Natural gas
- Main Material:Stainless steel
- Cover/Lid:Cover included
- Cutout Size:Not specified
- Additional Feature:Wok-compatible grate
- Additional Feature:Professional integrated look
- Additional Feature:Protective burner covers
VEVOR Double Grilling Side Burners 17,000BTU (2-Pack)
VEVOR’s Double Grilling Side Burners suit you best in case you want true two-zone power—two 17,000 BTU burners let you stir-fry on one side while you keep sauces simmering on the other. Built-in burners hold steady heat even whenever wind kicks up, and LED-lit knobs keep adjustments easy after dark. You get a propane regulator plus nozzles for natural gas and LP (LP default), so you can switch fuels fast. Food-grade 304 stainless resists rust and high heat, while the cover, removable grate, drip tray, and smooth surfaces simplify cleanup. Fit: 25.2 x 13.4 x 12.4; cut-out 20 x 12.5 x 8.46.
- Burner Count:Double burner
- Total BTU:34,000 BTU (2×17,000)
- Fuel Type:LP/NG convertible (LP default)
- Main Material:304 stainless steel
- Cover/Lid:Stainless steel cover
- Cutout Size:20″×12.5″×8.46″
- Additional Feature:Wind-stable burners
- Additional Feature:Built-in drip tray
- Additional Feature:Propane regulator included
Factors to Consider When Choosing Grilling Side Burners**
At the time you’re choosing a grilling side burner, you’ll want to match the BTU output range to how you cook and confirm it’s compatible with your fuel type. Next, check burner count and size so you’ve got enough space and control for sauces, sides, or a full pot. Finally, prioritize durable, weather-resistant materials and make sure the cutout fit and installation requirements match your grill island setup.
BTU Output Range
How hot should your side burner really get? BTU output tells you its heat capacity, which shapes how fast and evenly you’ll cook. Most side burners land between about 12,000 and 17,000 BTU, and that range covers very different tasks.
In case you mainly warm sides, simmer chili, or build sauces while you grill, 12,000 BTU usually does the job without scorching. In case you want rapid boils, big stockpots, or high-heat searing in a pan, aim for 15,000–17,000 BTU for stronger, faster heating. Higher BTUs also help outdoors during wind steals heat, because you’ll regain temperature quickly after adding food. Match the rating to your cooking style, typical meals, and how much you’ll cook at once.
Fuel Type Compatibility
Because your side burner’s jets and fittings are built for a specific gas, you need to match the unit to the fuel you actually have—liquid propane (LP), natural gas (NG), or a dual-fuel model with a proper conversion kit. Choose LP in case you’re running tanks; you’ll typically get the right regulator and LP nozzles out of the box. Pick NG assuming you’ve got a plumbed gas line; it needs different orifices and the correct fittings to tie into your supply. Should you want flexibility, buy a model that includes (or officially supports) a conversion kit, and follow the manufacturer’s steps exactly. Using the wrong fuel can hurt performance, damage components, or create safety risks. Fuel choice also changes real-world heat output and efficiency.
Burner Count And Size
After you’ve matched the side burner to your gas type, focus on burner count and size since they dictate what you can cook at the same time and how well it cooks. A single burner works for simple jobs like warming sauce or boiling water, but a double burner lets you sear steaks while you simmer corn or heat a skillet for fajitas.
Next, check burner output in BTUs and match it to your style: higher BTUs give fast, intense heat for searing, while moderate output keeps delicate foods at a steady simmer. Burner diameter matters too—bigger heads support larger pans and stockpots without hot spots. Also look at burner depth and mounting; a well-set burner keeps the flame stable for consistent heat outdoors. Finally, confirm the footprint fits your cutout space.
Materials And Weather Resistance
While BTUs and burner layout drive performance, the materials determine whether your side burner keeps performing season after season. Look for premium 304 stainless steel: it’s food-grade, tough, and highly resistant to corrosion. That stainless construction fights rust once rain hits, humidity rises, or thunderstorms roll through, so you won’t deal with flaking metal or weakened seams.
You’ll also want practical protection for downtime. Removable covers and lids shield the burner from dust, wind, and blown-in debris, cutting wear between cookouts. Prioritize smooth finishes and built-in drip trays, too—they make cleanup faster, prevent greasy buildup, and help the unit stay sanitary and reliable outdoors. With quality materials, your burner keeps its structure and function despite months of exposure.
Cutout Fit And Installation
How do you make sure a side burner drops into your outdoor kitchen like it was made for it? Start from measuring your cutout precisely—width, depth, and height—so the unit sits secure and flush. Don’t guess: match your numbers to the manufacturer’s recommended cutout size, because an opening that’s tight can prevent seating, while one that’s oversized can reduce stability and affect performance.
Leave room for ventilation and for your hands throughout hookup and servicing. Choose a model built for drop-in installs, with a removable drip tray and a lid that clears surrounding surfaces for easy access. Finally, check alignment: position burner bowls and control knobs so they don’t clash with grill lids, drawers, or cabinet doors during use.
Wind Resistance Design
Even though your outdoor kitchen sits in a sheltered spot, gusty days can still wreak havoc on a side burner’s flame, wasting fuel and stalling your cook. Look for deep-mounted burners that sit below the top surface, so airflow can’t easily blow the flame out.
Choose models with built-in burner covers or protective lids and stainless steel construction to block crosswinds and guard key components from weather. A truly wind-resistant design keeps the flame stable and pairs it with protective grates that hold cookware steady while maintaining consistent heat output. Check knob placement, too: controls set away from the flame stay easier to use whenever wind swirls heat and flare. At the time the burner holds steady intensity, you’ll waste less gas and cook faster, even on blustery weekends.
Cleaning And Maintenance Features
A steady flame on windy days won’t matter much in case your side burner turns into a greasy, rust-prone mess after a few cooks. Choose models with removable grates and drip trays so you can lift parts out and wash them thoroughly. Look for stainless steel surfaces and covers, since they resist rust and corrosion and stay presentable outdoors. A smooth, no-cranny design with integrated drip management cuts splatter and oil buildup, so you won’t scrub as often. Protective lids or fitted covers shield the burner from dirt, dust, and rain, which reduces cleanup between cookouts. Finally, pick easy-turn control knobs that you can wipe down fast, keeping your station clean and ready to fire up anytime.
