Onlyfire Grills 40" 5-Burner Built-In Grill Review: Who It Fits and Who Should Skip It
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This onlyfire grills 40 5 burner built in grill review focuses on the GS377 model, a natural gas unit designed for permanent outdoor kitchen installations. It offers 885 square inches of total cooking surface area, providing ample space for large family meals or backyard gatherings. The grill features a robust 304 stainless steel construction for its body, burners, and grates, ensuring durability against rust and warping. With a total output of 80,000 BTU from five burners, it delivers significant heating power for consistent grilling results. The exact cutout dimensions ensure a seamless fit within standard countertops.
What stands out
- 304 stainless steel body, burners, and grates for rust resistance
- 80,000 BTU total output with four 14,000 BTU main burners and one 10,000 BTU rear infrared rotisserie burner
- 885 square inches of total cooking surface area
- Exact cutout size of 38 3/8 inches wide by 21 1/4 inches deep
- Center-mounted built-in thermometer for real-time temperature monitoring
Who it fits
Good fit for
You should consider this grill if you are building a custom outdoor kitchen and need a permanent, high-capacity cooking solution. The exact cutout dimensions make it ideal for homeowners who want a seamless integration with their existing countertops. The large 885 square inch cooking area suits families or entertainers who frequently host gatherings. The 304 stainless steel build is perfect for those in coastal or humid climates who need superior rust resistance. The infrared rotisserie burner also appeals to users who enjoy slow-roasting whole meats.
Who should skip it
Skip this model if you prefer portable cooking or lack a dedicated outdoor kitchen space. This is a built-in unit requiring a specific cutout of 38 3/8 inches wide by 21 1/4 inches deep, which may not fit standard prep tables or temporary setups. If you do not have a natural gas line installed, you will need to choose the propane variation or install gas infrastructure. The 175-pound weight and fixed form factor mean it is not designed for easy relocation. Users seeking a compact grill for small balconies will find the 40-inch width too large for their space.
Verdict: The Onlyfire GS377 is a durable, high-BTU built-in grill suited for permanent outdoor kitchens. Its stainless steel construction and large cooking area make it a practical choice for serious home cooks.
Key specs explained for this grill
Cooking Surface: 885 Sq.In
This total area provides ample room for large family meals or backyard parties. You can fit multiple steaks, burgers, or vegetables simultaneously. When shopping for outdoor cooking equipment, compare this capacity to smaller griddles or compact pizza ovens to ensure you have enough space for your typical gathering size.
Heat Output: 80,000 BTU
This rating indicates the total power of the four main burners and the rear infrared rotisserie burner. High BTU output allows for restaurant-worthy searing and locking in meat juices. When comparing grills, look for this level of power to ensure you can handle high-heat cooking tasks efficiently and cook large cuts of meat quickly.
Material: 304 Stainless Steel
This grade of steel offers exceptional rust resistance and deformation resistance under high temperatures. It ensures the body, burners, and grates last for years with minimal maintenance. When selecting outdoor cooking gear, prioritize 304 stainless steel over lesser grades to guarantee durability against weather exposure and frequent high-heat use in your outdoor kitchen.
Form Factor: Built-In
This unit is designed for permanent installation into standard outdoor countertops. The exact cutout dimensions ensure a seamless fit, saving you installation hassle. When planning your outdoor kitchen layout, verify your countertop space matches these requirements. This format suits those seeking a permanent, integrated cooking station rather than a portable or freestanding grill.
Design and build specs
According to the listing, the Onlyfire Grills GS377 features a full-body construction made from 304 stainless steel. This material extends to the burners and grates. You get rust resistance and deformation resistance under high heat. The finish remains shiny even after years of outdoor exposure. This choice suggests you need low maintenance care for your permanent outdoor kitchen setup.
The unit weighs 175 pounds and measures 39 inches wide, 21 inches high, and 26 inches long. You must account for an exact cutout dimension of 38 3/8 inches wide by 21 1/4 inches deep by 8 1/2 inches high. This precise sizing ensures a seamless fit within most standard outdoor countertops. The heavy-duty steel lid maintains its sleek appearance while protecting the internal components. You benefit from a durable structure that withstands frequent use without warping.
The grill includes a center-mounted built-in thermometer for real-time temperature monitoring. You can track cooking progress precisely without opening the lid. The stainless steel H-burners deliver uniform heat across the 885 square inch cooking surface. This layout eliminates hot spots, allowing you to cook every dish with consistent results. The design prioritizes durability and precise temperature control for serious outdoor chefs.
Setup and everyday use guide
This unit is a built-in grill, so you must integrate it into a permanent outdoor kitchen structure. The listing specifies an exact cutout dimension of 38 3/8 inches wide, 21 1/4 inches deep, and 8 1/2 inches high. You need to ensure your countertop cavity matches these measurements precisely. The grill itself measures 39 inches wide, 21 inches high, and 26 inches long. It weighs 175 pounds, which requires a sturdy support structure to hold the weight safely.
The GS377 model runs on natural gas. You will need a dedicated gas line connection to operate it. The grill delivers 80,000 BTU of total power. This comes from four main burners rated at 14,000 BTU each. A rear infrared rotisserie burner adds 10,000 BTU. The stainless steel H-burners are designed to spread heat evenly. This setup helps eliminate hot spots on the 885 square inch cooking surface.
For daily use, the center-mounted thermometer allows you to monitor internal temperatures without opening the heavy-duty steel lid. The 304 stainless steel body, burners, and grates resist rust and warping. This material choice means you can expect durability with minimal maintenance. The large cooking area accommodates family meals or large gatherings. You can cook multiple items simultaneously. The built-in design keeps the grill secure and integrated into your outdoor space.
Before you buy this grill
You must verify your countertop cutout measures exactly 38 3/8 inches wide, 21 1/4 inches deep, and 8 1/2 inches high before purchasing. This natural gas model requires a dedicated gas line and professional installation. You will need high-heat gloves and quality grilling tools to manage the 80,000 BTU output safely. The 304 stainless steel body resists rust, but you should cover it when not in use to maintain its finish. This grill suits those building a permanent outdoor kitchen. It differs from portable pizza ovens or compact griddles by its fixed nature and high capacity. If you prefer flexible cooking options or limited space, consider smaller units. This built-in system demands a specific footprint. Ensure your outdoor layout can accommodate its 175-pound weight and substantial size. Regular cleaning of the grates and burners will preserve performance. Check your local gas codes for compliance before installation.
Check before you buy
- Verify cutout dimensions match 38 3/8" W x 21 1/4" D x 8 1/2" H
- Confirm natural gas line availability and professional installation needs
- Ensure countertop supports 175 pounds and allows proper ventilation
- Check local gas codes for compliance with built-in installations
The product at a glance
Onlyfire 40" 5-Burner Natural Gas Grill
Best for: Large outdoor kitchens needing high BTU power
- Fuel Type
- Natural Gas
- Cooking Area
- 885 sq. in.
- Heat Output
- 80,000 BTU
- Burner Count
- 4
- Form Factor
- Built-in
- Primary Material
- 304 stainless steel
View on Amazon: Onlyfire 40" 5-Burner Natural Gas Grill Affiliate link
The Onlyfire Grills 40" 5-Burner Built-In Grill (model GS377) is a natural gas unit built from 304 stainless steel. It offers 885 square inches of cooking space and generates 80,000 BTU across four main burners and one rear infrared rotisserie burner. Weighing 175 pounds, it requires a precise cutout of 38 3/8" W x 21 1/4" D x 8 1/2" H. This grill suits those seeking heavy-duty, even heat for large gatherings.
Pros
- 304 stainless steel body, burners, and grates for rust resistance
- 885 square inches of total cooking surface area
- 80,000 BTU output with four 14,000 BTU main burners
- Rear infrared rotisserie burner for versatile cooking
- Built-in thermometer for real-time temperature monitoring
Cons
- Heavy weight of 175 pounds complicates installation
- Requires a specific cutout dimension of 38 3/8" W x 21 1/4" D x 8 1/2" H
- No mention of side shelves or storage in specifications
Good fit if
- You have a standard outdoor kitchen cutout ready for installation
- You need high BTU output for searing large quantities of meat
- You want a durable stainless steel build for long-term use
Skip if
- You prefer a propane fuel source over natural gas
- You lack the space for a 40-inch wide grill unit
- You want a lightweight grill that is easy to move
Verdict: Onlyfire Grills 40" 5-Burner Built-In Grill fits homeowners with dedicated outdoor kitchens who need serious power and a large cooking area. It is a solid choice for those prioritizing stainless steel durability and even heat distribution.
Specifications side by side
| Spec | Onlyfire 40" 5-Burner Natural Gas Grill |
|---|---|
| Fuel Type | Natural Gas |
| Cooking Area | 885 sq. in. |
| Heat Output | 80,000 BTU |
| Burner Count | 4 |
| Form Factor | Built-in |
| Primary Material | 304 stainless steel |
| Placement | Outdoor |
| Material | Stainless Steel |
| Heating Method | Infrared |
| Dimensions | 26 × 39 × 21 inches |
| Weight | 175 pounds |
| Size | 40" NATURAL GAS |
| Color | Silver |
| Model | GS377 |
Frequently asked questions
Does the Onlyfire 40" grill fit a standard 39-inch cutout?
No. The unit measures 39 inches wide, but the required cutout is 38 3/8 inches wide. You must leave a 3/4-inch gap on each side for proper installation. This clearance ensures the built-in grill sits securely within your outdoor kitchen structure without touching the surrounding cabinetry.
What fuel type does the Onlyfire GS377 use?
It uses natural gas. This model connects directly to your home’s natural gas line rather than using propane tanks. You will need a dedicated gas line installed by a professional to operate this unit safely and effectively in your outdoor kitchen setup.
How heavy is the Onlyfire 40-inch built-in grill?
The grill weighs 175 pounds. This significant weight requires a sturdy countertop structure to support it. Ensure your outdoor kitchen base is reinforced enough to hold this mass without sagging or shifting over time, especially when the grill is fully loaded with food.
What is the total cooking area of this grill?
It provides 885 square inches of total cooking surface area. This large capacity allows you to cook multiple steaks, burgers, or vegetables simultaneously. The spacious design makes it suitable for large family meals or hosting backyard gatherings where you need to prepare food for many people at once.
Is the Onlyfire GS377 made from stainless steel?
Yes. The full-body construction, including the burners and grates, is made from 304 stainless steel. This material offers rust resistance and deformation resistance under high heat. The finish remains shiny and durable, making it a solid choice for homeowners prioritizing long-term durability in their outdoor kitchen.
What are the exact dimensions for the cutout?
You need a cutout that is 38 3/8 inches wide, 21 1/4 inches deep, and 8 1/2 inches high. These exact measurements are critical for a proper fit. Verify your countertop dimensions match these specs precisely before purchasing to avoid installation issues or gaps around the unit.