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You want to sear steaks, grill corn, and simmer baked beans all at once without running back to the kitchen. A three-burner gas grill with a side burner makes that possible. The hard part is finding one that holds heat evenly, cleans up fast, and fits your deck or budget without a multi-hour assembly hassle.
I’m Min — the founder and writer behind Gadgets Feed. This guide is built by comparing the manufacturers’ published specifications and the patterns across verified customer reviews, so you get each pick’s real strengths and trade-offs instead of marketing spin.
Here is the direct breakdown of the best 3 burner gas grill with side burner choices, from a budget-friendly cart to a premium natural-gas powerhouse.
Quick Picks
- Monument Grills Mesa Series, Mesa305 — Top Performer
- Monument Grills Mesa Series, Mesa325 — Best Value
- Weber Genesis E-335 Natural Gas Grill — Premium Pick
- R.W.FLAME 3-Burner Propane Gas Grill — Feature-Packed
- COWSAR 3-Burner Propane Gas Grill — Compact Workhorse
- Electactic 3-Burner Propane Gas Grill — Smart Layout
- Feasto 3 Burner Propane Gas Grill — Budget Champion
How To Choose The Best 3 Burner Gas Grill With Side Burner
Three main burners plus a side burner give you four separate heat zones, but the parts that touch your food and how the grill drains grease matter more than the number of knobs.
Focus on cooking surface area, not just total BTU
A 48,000 BTU (British Thermal Unit, a measure of heat output per hour) grill sounds powerful, but if the cooking grates are small you still cannot fit a full rack of ribs and a tray of veggies at the same time. Check the main grilling square inches — 360 to 400 is comfortable for a family of four, while 500-plus lets you cook for a crowd.
Grate material determines sear and scrubbing effort
Porcelain-enameled cast iron holds heat better than plain steel and resists rust, but it is heavier. Steel grates are lighter and easier to handle but may not produce the same dark sear marks. Stainless steel is rust-resistant but can discolor over many seasons.
Side burner flexibility and folds
A side burner rated 8,000 to 10,500 BTU is enough for sauces or boiling corn. Some models let the side burner fold down into a shelf, which saves space when you are not using a pot. Others keep it fixed as a dedicated cooking station.
Quick Comparison
| Model | Best For | BTU | Cooking Area | Grate Material | Amazon |
|---|---|---|---|---|---|
| Monument Grills Mesa305 | High heat with a window lid | 48,000 BTU | 570 sq in | Porcelain-enameled cast iron | $399.00Amazon |
| Monument Grills Mesa325 | Black finish, same performance | 48,000 BTU | 570 sq in | Porcelain-enameled cast iron | $399.00Amazon |
| Weber Genesis E-335 | Premium natural gas setup | — | 787 sq in | Porcelain-enameled cast iron | $1,249.00Amazon |
| R.W.FLAME 3-Burner | Complete accessory kit included | 34,000 BTU | 326.65 sq in | Porcelain enameled cast iron | $279.99Amazon |
| COWSAR 3-Burner | Quick assembly and portability | 34,000 BTU | 366 sq in | Porcelain-enameled cast iron | $259.99Amazon |
| Electactic 3-Burner | Hidden tool hooks and bottle opener | 34,000 BTU | 373 sq in | Porcelain-enameled | $242.17$279.99Amazon |
| Feasto 3 Burner | Budget-friendly entry point | 38,000 BTU | 504 sq in | Porcelain-enameled | $229.00Amazon |
In‑Depth Reviews
1. Monument Grills Mesa Series, Mesa305
This three-burner grill hits 650°F in 15 minutes and lets you peek through the lid without losing heat.
You get 48,000 BTU from three main burners plus a side burner. Buyers report it outperforms a Weber Spirit at a lower price. The porcelain-enameled cast iron grates hold heat for sear marks (dark grill lines on meat), and the full-window lid means you check your food without lifting the hood and losing 50 degrees of temperature. The knob lights glow white when off and red on high, so you know each burner’s status at a glance from across the deck.
A 405 square inch cooking surface plus a 165 square inch warming rack gives you a total of 570 square inches, which the brand says handles up to 30 burgers at once. Owners mention the cast iron grates fit right in the sink for cleaning. One buyer received a cracked lid during shipping, but the company sent a full replacement in three days — that kind of after-sale service is rare at this price tier.
The side burner fires up for sauces and sides while the main burners do the heavy lifting. Assembly runs about an hour, and the instructions are clear with fasteners pre-installed. The single real catch is that the propane regulator’s safety sensor may need a quick reset if the gas flow trips.
Firepower and features
- 48,000 BTU total output heats up fast and sears well
- 570 sq in total cooking area fits a 20-pound turkey plus sides
- Illuminated knobs show grill status without guessing
- Window lid reduces heat loss when checking food
A couple of assembly realities
- Propane regulator safety sensor may need manual reset
- Some units arrived with minor shipping damage (lid cracks)
Reach for this if: you want the highest BTU output in this group, a clear lid to watch your food, and grates that make sear marks easy.
Look elsewhere if: you prefer a smaller footprint or need natural gas — this runs on propane only.
2. Monument Grills Mesa Series, Mesa325
The same powerhouse burners and window lid as the Mesa305, wrapped in a black finish that hides smudges.
This is mechanically identical to the Mesa305 — same 48,000 BTU output, same 570 square inch cooking area, same illuminated control knobs and window lid — but in a black cabinet that hides smudges better than stainless steel. Customers note the build is solid, with a double-walled lid and cast aluminum sides that look and feel sturdier than many grills at this mid-range price point.
Assembly took one buyer about 30 minutes using a YouTube video, and all reviewers mention the packaging is overengineered with foam, cardboard, and wood protecting every metal edge. The side burner works without a hitch, and the grill reaches 500°F in just a few minutes, according to one verified owner. The window does need occasional cleaning with denatured alcohol to stay clear, but that is a small trade-off for not lifting the lid every five minutes.
What stands out
- 48,000 BTU heats quickly and evenly across all burners
- Double-walled lid and cast aluminum sides feel premium
- Illuminated knob lights give clear high-heat feedback
- Excellent packaging reduces shipping damage
Honest trade-offs
- Window lid can cloud over and needs alcohol to clean
- Black finish shows dust more than stainless steel
A solid pick for: anyone who wants the Mesa305 performance but prefers a black look that resists showing fingerprints.
skip it if: you need natural gas — this model runs on propane.
3. Weber Genesis E-335 Natural Gas Grill
The largest grill here at 787 square inches, with a natural gas hookup and a dedicated sear zone.
With a total cooking surface of 787 square inches, this Genesis E-335 is the largest grill in this lineup by a wide margin — compared to the Monument Mesa’s 570 square inches. It runs on natural gas, so you never swap a propane tank. The three PureBlu burners (burners with raised flame openings) plus a side burner and an extra-large sear zone give you four distinct cooking areas. The raised flame openings are designed to let food debris fall past the burners, which reduces clogging over time.
Weber’s FLAVORIZER bars sit above the burners and vaporize drippings back into the food for more grilled flavor, while the grease management system collects the rest in a pull-out tray for quick disposal. Reviewers point out the grill cooks well and is easy to clean, but assembly is a challenge — one reviewer called it “a beast to assemble” and noted the instructions are picture-only with no written steps. A few owners also reported interior rust on griddle inserts after a few months, so regular maintenance matters on this premium model.
What you get at the top end
- 787 sq in total cooking area — biggest in the roundup
- PureBlu burners stay cleaner with raised flame openings
- FLAVORIZER bars add grilled flavor and reduce flare-ups
- Natural gas means no tank refills
The hard parts
- Assembly is long and the manual has no written instructions
- Some shoppers say rust on internal components after a few months
- Large footprint requires substantial patio space
Ideal for: someone who cooks for a crowd regularly, wants natural gas, and values Weber’s brand reputation.
Not ideal if: you are tight on space or want a simpler assembly experience.
4. R.W.FLAME 3-Burner Propane Gas Grill
This 34,000 BTU cart comes with a dust cover, hooks, and a bottle opener in the box — no second shopping trip needed.
Three main burners at 8,000 BTU each plus a lidded side burner at 10,000 BTU give you a total of 34,000 BTU. The cooking surface is 326.65 square inches on the main grates with a 124.80 square inch warming rack on top. What sets this R.W.FLAME apart is the included accessories — a dust cover, side hooks, towel rack, gas canister holder, tool holder, and a built-in bottle opener arrive with the grill.
Buyers report it took about 45 minutes to assemble and that the four heavy-duty wheels (two with locks) roll smoothly on a patio. One reviewer noted a quality issue with the lid-lifting mechanism after minimal use, so the materials may not match the price of the premium models in this list. It is a solid mid-range option if you want a complete accessory set without hunting for parts later.
What you get in the box
- Includes cover, hooks, towel rack, bottle opener, and canister holder
- Four casters (two locking) for easy movement
- Lidded side burner protects sauces from wind
Concerns from owners
- Lid-lifting mechanism reported to fail after light use
- Smaller main grilling area than most competitors
Reach for it if: you want a turnkey package with all the extras (cover, hooks, canister holder) included.
Think twice if: you grill often and need long-term durability from the lid hardware.
5. COWSAR 3-Burner Propane Gas Grill
A 34,000 BTU cart that assembles in under 10 minutes and folds its side burner into a shelf when not in use.
This COWSAR grill lands at 34,000 BTU (with a max of 36,000 BTU) across three independent burners, giving you 366 square inches of main grilling area plus a warming rack and a foldable side burner. The side burner folds down into a shelf when not in use, which saves a surprising amount of space on a small patio. Owners mention it is portable, heats fast, and maintains heat well, and one buyer mentioned easy assembly in less than 10 minutes.
At 42.99 x 48.27 x 22.05 inches, it is the most compact cart in this group. The four multidirectional casters with two locking brakes let you move it around a deck or store it against a wall. One owner pointed out that grease can spread excessively during cooking, so the drip tray needs attention. The foldable side burner is a real space-saver, but the trade-off is a smaller total cooking area than the Feasto or Monument grills.
The space-saving advantages
- Fold-down side burner converts to extra shelf area
- Very fast assembly — under 10 minutes
- Porcelain-enameled cast iron grates for even heat
The small catches
- Grease spread can be messy during longer cooks
- No locking lid restrains the hood
Good for: small patios, apartment balconies, or tailgating where every inch of shelf space counts.
Not the best for: large parties where you need a full 500+ sq in cooking surface.
6. Electactic 3-Burner Propane Gas Grill
A 34,000 BTU grill with hidden tool hooks that keep your deck tidy, plus a built-in SUS304 (rust-resistant stainless steel) bottle opener.
Three stainless steel main burners and a 10,500 BTU side burner produce 34,000 BTU total on this Electactic grill. The main cooking surface measures 373 square inches, and the real standout is the hidden tool hooks integrated into the side shelf — your spatula and tongs stay within reach but out of sight when not in use. The built-in SUS304 bottle opener adds a party-friendly touch, and the control knob bezels are the same grade of stainless steel for a corrosion-resistant finish.
One reviewer converted this grill to run on natural gas and confirmed it works great, calling it lightweight and easy to move with no rust issues so far. The rear-draw grease system uses a slanted tray and a removable cup to funnel oil away from the burners, which keeps mess under control. The double-layer hood holds heat well, and customers note cleaning is easy since the flame covers and racks fit in a dishwasher.
Smart details
- Hidden tool hooks keep the workspace tidy
- SUS304 stainless steel bezels and bottle opener resist rust
- Dishwasher-safe flame covers and grates
- Easy natural gas conversion (per verified owner)
What to watch
- No side burner on this model, despite the listing (some units shipped without it)
- 373 sq in is adequate but not spacious for large gatherings
Reach for this if: you want a clean-looking grill with thoughtful storage and the option to switch to natural gas later.
Look elsewhere if: you need a guaranteed side burner and a large cooking surface.
7. Feasto 3 Burner Propane Gas Grill
A 38,000 BTU grill with 504 sq in of cooking space — the most area for the lowest price in this roundup.
This Feasto grill delivers 38,000 BTU from three 10,000 BTU main burners and an 8,000 BTU side burner, with a total cooking area of 504 square inches — that is 364 square inches on the main grates and a 140 square inch warming rack. The porcelain-enameled main body and lid are rated to withstand heat up to 1,700°F, which helps resist peeling and discoloration over time. Reviewers point out it works well for two people and looks sharp for the price.
The trade-off is assembly time: shoppers say it took over 3 hours to put together, with one reviewer noting four hours. The lighting is a breeze once it is built, and the grates transfer heat quickly, producing solid results for burgers and sausages. For the cooking area relative to the price, this is tough to top if you have patience with a wrench.
The appeal
- 504 sq in total cooking area beats most grills at this price
- Porcelain-enameled body resists heat up to 1,700°F
- Lightweight enough to move around a yard
The reality check
- Assembly can take 3-4 hours
- Some units arrived with minor scratches from shipping
Great for: budget-conscious buyers who want a large cooking surface and are okay spending an afternoon assembling.
Not for: those who want quick assembly or a premium fit and finish.
Understanding the Specs
BTU — British Thermal Units
This number tells you how much heat the burners can produce per hour. Higher BTU means faster preheating and better searing potential, but only if the grill body and grates hold that heat. A 48,000 BTU grill with thin steel grates can still struggle, while a 34,000 BTU grill with good porcelain-enameled cast iron can produce an even sear. BTU is one piece of the puzzle, not the whole story.
Cooking Surface Area (sq in)
This is the flat space you actually cook on, usually split between the main grates and a warming rack above. A grill with 500-plus square inches can fit about 23 burgers at once, while 360 square inches is comfortable for a family of four. Always check the main grilling area separate from the warming rack — that top shelf is for keeping food warm, not for searing.
FAQ
What does the side burner do on a 3 burner gas grill?
Is 34,000 BTU enough for a 3 burner grill with side burner?
How long does it take to assemble a 3 burner gas grill?
Can you use a 3 burner gas grill with natural gas?
How many burgers fit on a 504 square inch grill?
What is the difference between porcelain-enameled grates and stainless steel grates?
How do you clean a 3 burner gas grill with side burner?
What size patio do I need for a 3 burner gas grill cart?
Does a higher BTU output mean better grilling?
Is a 3 burner gas grill with side burner portable enough for tailgating?
Final Thoughts: The Verdict
If you want one dependable pick, the best 3 burner gas grill with side burner is the Monument Grills Mesa305 because it combines the highest BTU output in this group (48,000 BTU), the largest cooking surface among mid-range options (570 sq in), and a window lid that lets you check food without lifting the hood. If you want the same performance in a black finish that hides smudges, grab the Monument Grills Mesa325. And for a premium natural gas setup with the biggest cooking area (787 sq in) and Weber’s reputation, the Weber Genesis E-335 delivers class-leading capacity for serious cooks.
How We Picked
We do not accept paid placement. Every pick is matched to a real buyer and a real use-case; we do not hands-on test units.
Sources & Methodology
Specifications: manufacturer listings and product documentation. Review insights: verified customer reviews, as of July 2026. Pricing: not shown on this page (it changes often); check the current price via the retailer link.
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