The difference between a good backyard cookout and a great one often comes down to heat management. A grill that runs hot in the center and cold on the edges forces you to shuffle food constantly, while a weak side burner turns sauce-making into a frustrating stove-top detour. Finding a 3-burner gas grill with a side burner that delivers consistent heat across the grates and enough auxiliary power for sides is the real challenge.
I’m Mohammad — the founder and writer behind ProteinJug. My research for this guide involved comparing burner BTU ratings, cooking surface areas, and build materials across the mid-range to premium market to identify which models actually deliver on their heat claims without falling apart after a season.
After analyzing over a dozen models and filtering through hundreds of customer experiences, this guide breaks down the top performers available right now to help you choose the right 3 burner gas grill with side burner for your outdoor cooking style.
How To Choose The Best 3 Burner Gas Grill With Side Burner
Three burners gives you zone cooking — high heat for searing on one side, indirect heat for slow-cooking on another, and a warm zone on the third. Add a side burner, and you’ve got a full outdoor kitchen capable of handling an entire meal. But not all configurations deliver the same experience.
Total BTU vs. Burner-Level BTU
A grill advertising 48,000 BTU total might sound powerful, but that number is split across four burners. A typical setup includes three main burners at 8,000 to 12,000 BTU each and a side burner between 9,000 and 10,500 BTU. A main burner below 8,000 BTU struggles to sear properly, while a side burner below 9,000 BTU will take too long to boil water for sides or sauces.
Cooking Grate Material
Porcelain-enameled cast iron retains heat better than stainless steel, creating those strong sear marks and holding temperature when you open the lid. Stainless steel grates are lighter and easier to clean but don’t hold heat as well. For a 3-burner setup, cast iron grates help maintain even heat across the surface, reducing cold spots.
Side Burner Utility and Placement
Look for a lidded side burner that folds flat or integrates into the side table when not in use. A cover prevents debris from collecting inside the burner port. The position should allow you to access the main grates without reaching over a hot flame. Some models place the side burner on a dedicated shelf that doubles as prep space when the burner is off.
Build Quality and Warranty
Stainless steel construction varies in grade. AISI 304 stainless on the lid and body resists corrosion far better than 201 stainless. Look for porcelain-enameled parts on the cook box and lid, which resist peeling and rusting. A 10-year warranty on the cook box and burners is a strong indicator the manufacturer expects the grill to last.
Quick Comparison
On smaller screens, swipe sideways to see the full table.
| Model | Category | Best For | Key Spec | Amazon |
|---|---|---|---|---|
| Weber Genesis E-325 | Premium | High-end daily use & searing | 641 sq in total / Sear Zone | Amazon |
| Weber Spirit E-325 | Premium | Reliable brand with sear power | 360 sq in / 2 Boost Burners | Amazon |
| Monument Grills Mesa325 | Mid-Range | Viewing lid & knob lights | 570 sq in / 48,000 BTU total | Amazon |
| Monument Grills Mesa305 | Mid-Range | Stainless finish with knob lights | 570 sq in / 48,000 BTU total | Amazon |
| Permasteel 3-Burner | Mid-Range | Compact storage & foldable shelves | 512 sq in / 30,000 BTU total | Amazon |
| Electactic G31 PRO | Mid-Range | Largest cooking area for price | 489 sq in / 34,000 BTU total | Amazon |
| Electactic 34,000 BTU | Mid-Range | Clean grease management system | 373 sq in / 34,000 BTU total | Amazon |
| R.W.FLAME 3-Burner | Mid-Range | Multifunctional griddle & grill | 451 sq in / 34,000 BTU total | Amazon |
| GRILL DEPOTS 3-Burner | Budget | Entry-level with side burner | 369 sq in / 39,000 BTU total | Amazon |
In‑Depth Reviews
1. Weber Genesis E-325
The Weber Genesis E-325 sits at the top of the 3-burner class for a reason. Its PureBlu burners have a raised flame opening design that keeps food debris from falling into the burners, reducing clogs and corrosion over time. The extra-large Sear Zone allows you to seat multiple steaks at once without crowding, and the porcelain-enameled cast-iron grates hold heat exceptionally well.
The total cooking area of 641 square inches is among the largest in this category, with a warming rack spacious enough to toast buns or hold a full tray of food. The grease management system uses a pull-out tray located under the cook box, making cleanup faster than models that rely on a small drip pan. The FLAVORIZER bars catch drippings and vaporize them for smoke flavor while funneling grease away from the burners to prevent flare-ups.
Assembly takes around 90 minutes using the BILT app, and the build quality is noticeably sturdier than the Spirit line. The side tables provide generous prep space, and the frame is built from cast iron, giving it a solid, wobble-free feel. The 10-year warranty on the cook box and burners adds long-term confidence.
Why it’s great
- PureBlu burners resist clogging from debris
- Extra-large Sear Zone hits high searing temps
- 641 sq in total cooking area handles large groups
- Pull-out grease tray for easy disposal
Good to know
- Assembled weight is heavy; two people recommended
- Grate hooks under side shelf can dislodge easily
- Fuel gauge not included
2. Weber Spirit E-325
The Weber Spirit E-325 brings a dedicated Sear Zone with two Boost Burners that deliver 40% more power than the standard burners. This feature alone sets it apart from most 3-burner grills in its class, letting you achieve restaurant-quality sear marks on steaks and burgers in minutes. The porcelain-enameled cast-iron grates retain heat evenly across the 360-square-inch cooking surface.
Weber includes stainless steel Flavorizer bars that catch drippings and vaporize them for smoky flavor while funneling grease away from the burners to prevent flare-ups. The Snap-Jet ignition system lights each burner individually with a simple press-and-turn motion, and the porcelain-enameled lid and cook box resist rust and peeling better than painted alternatives.
The 10-year limited warranty covers the cook box and burners, and the grease management system uses a large drip pan with a removable slide-out tray for quick cleaning. Four tool hooks keep your spatulas and tongs organized, and the Weber Works side rails accept snap-on accessories like a bottle holder or extra hooks.
Why it’s great
- Boost Burners provide powerful searing capability
- Snap-Jet ignition lights burners with one hand
- Flavorizer bars boost grilled taste while reducing flare-ups
- 10-year warranty on cook box and burners
Good to know
- Plastic wheels can fall off on uneven ground
- New 2025 model may have accessory incompatibility
- Small part defect reported in one review
3. Monument Grills Mesa325
The Monument Grills Mesa325 introduces a viewing lid that lets you check on food without lifting the lid and losing heat. Combined with a fuel gauge, this feature gives you real-time temperature monitoring without guesswork. The three main burners plus one side burner produce a total of 48,000 BTU, and the grill reaches 650°F in about 15 minutes for high-heat searing.
The porcelain-enameled cast-iron grates provide strong heat retention, and the cooking surface totals 570 square inches — 405 square inches primary plus 165 square inches on the warming rack. The knob lights change color to indicate off or high heat mode, adding a visual cue that helps manage the cooking process. The side burner has a lid that protects it from debris when not in use.
Assembly takes roughly 30 minutes with the help of a YouTube guide, and packaging is exceptionally secure with custom foam and wood inserts. The double-walled lid helps with heat retention, and the front doors provide easy access to the propane tank storage area. The built-in bottle opener and tool hooks keep essentials organized.
Why it’s great
- Viewing lid reduces heat loss when checking food
- Knob lights indicate grill status clearly
- Reaches 650°F in 15 minutes for searing
- Secure packaging prevents shipping damage
Good to know
- Glass window requires denatured alcohol for cleaning
- Lid may snag on cover if edges aren’t smooth
- Side burner is functional but not high-BTU
4. Monument Grills Mesa305
The Mesa305 shares the same 48,000 BTU output and 570-square-inch cooking area as the Mesa325, but swaps the black finish for a brushed stainless steel exterior. The knob lights remain, with white indicating off and red signaling high heat, and the viewing lid with sensitive temperature gauge lets you monitor without opening the lid.
The three main burners produce 12,000 BTU each, which is higher than many competitors in the mid-range tier. This higher per-burner output means faster preheating and better heat recovery when cooking large quantities. The porcelain-enameled cast-iron grates produce solid sear marks, and the side burner provides extra cooking space for sauces or sides.
Assembly is straightforward with clear instructions, and the packaging is well-designed to prevent damage during shipping. Customers consistently note that the build quality feels more substantial than the price suggests, with a solid frame and smooth rolling casters. The side burner cover protects the burner port from dirt and rain.
Why it’s great
- 12,000 BTU per burner for fast heating
- Brushed stainless finish resists fingerprints
- Knob lights improve nighttime grilling visibility
- Viewing lid with built-in thermometer
Good to know
- Lid window may need special cleaner for streaks
- Propane regulator may need reset if gas shuts off
- Not as heavy-duty as the Genesis line
5. Permasteel 3-Burner Propane Gas Grill
The Permasteel 3-Burner grill is designed for those who need a compact solution that doesn’t sacrifice cooking capacity. With a total cooking surface of 512 square inches (381 square inches primary plus 131 square inches warming rack), it can handle up to 33 burgers at once. The foldable side tables collapse for storage, making this a good fit for smaller patios or balconies.
The three stainless steel burners produce a combined 30,000 BTU, which is lower than some competitors but sufficient for consistent grilling across the porcelain-coated cast-iron grates. The grates provide good heat retention and even distribution, and the drop-down shelves with tool hooks keep utensils accessible. The four caster wheels include two locking casters for stability.
Assembly takes about two hours, and the instructions are clear with proper diagrams. The grease management system uses two slide-out drip drawers, making cleanup straightforward. Customers note that the build feels sturdy for the price range, with a compact footprint that doesn’t dominate a small outdoor space.
Why it’s great
- Foldable shelves for compact storage
- Two slide-out drip trays for easy cleaning
- 512 sq in total cooking area fits 33 burgers
- Sturdy locking wheels for stability
Good to know
- No gas gauge included
- Knobs feel flimsy with poor temperature markings
- Grease tray alignment can cause drips on propane tank
6. Electactic G31 PRO
The Electactic G31 PRO uses a 3-main-burner plus 1-side-burner configuration, producing a total of 34,000 BTU. The standout feature is the 489.17 square inches of total cooking space, which includes a 130-square-inch warming rack. The side burner runs at 10,000 BTU, which is on the higher end for this category and handles boiling water or simmering sauces effectively.
Build quality is a highlight here — the lid is constructed from AISI 304 stainless steel, while the body uses 201 stainless steel. This combination provides corrosion resistance where it matters most while keeping the overall cost reasonable. The cast-iron grates are porcelain-enameled for easy cleaning, and the grill includes a built-in bottle opener and side hooks for tools.
The four heavy-duty wheels include two locking casters, and the removable grease tray handles cleanup without fuss. Assembly takes about two hours with clear directions and an online video. Customers praise the even heat distribution and the sturdy feel of the all-stainless construction.
Why it’s great
- AISI 304 stainless lid for superior rust resistance
- 10,000 BTU side burner for efficient sides
- 489 sq in total cooking area
- Clear assembly instructions with video support
Good to know
- Some units reported propane valve/hose leaks
- Wheels rattle on uneven surfaces
- Shiny stainless finish causes glare in direct sun
7. Electactic 34,000 BTU Stainless Steel Grill
This Electactic model focuses on practical design touches that simplify grilling. The rear-draw slant grease system channels oil and residue away from the cooking area into a removable grease cup, keeping the grill cleaner during and after use. The side shelf includes hidden tool hooks that keep spatulas and tongs within reach but out of sight when not in use.
The three main burners produce 10,000 BTU each, with a 10,500 BTU side burner that’s slightly more powerful than the main units. The porcelain-enameled cast-iron grates provide a non-stick surface, and the built-in temperature gauge reads up to 1000°F for high-heat monitoring. The SUS304 control knob bezels resist corrosion and add a polished look.
Assembly is rated as straightforward by most customers, with the grill arriving mostly preassembled. The double-layer hood retains heat well, and the compact 373-square-inch cooking surface is suitable for 2–4 people. The grill includes a built-in bottle opener and moves easily on its four casters.
Why it’s great
- Rear-draw grease system keeps grill cleaner
- Hidden tool hooks for organized cooking
- 10,500 BTU side burner for hot sides
- SUS304 stainless bezels resist rust
Good to know
- Some units arrived with shipping damage
- Cooking area smaller than other mid-range options
- Sharp edges reported during assembly
8. R.W.FLAME 3-Burner Gas Grill
The R.W.FLAME grill integrates a griddle, grill grate, and side burner into one unit, supporting grilling, frying, and boiling. The three main burners produce 8,000 BTU each, and the lidded side burner delivers 10,000 BTU. The total cooking area is 451 square inches — 326.65 square inches primary plus 124.80 square inches warming rack — suitable for 2–3 people.
The grill is constructed from thickened 201 stainless steel for durability, and the porcelain-enameled cast-iron grates provide good heat conductivity. The four heavy-duty wheels include two locking casters for stability, and the pull-out residue collector and grease tray make cleanup simple. The built-in electronic ignition fires reliably with each press.
Assembly takes about 45 minutes, with clear instructions and well-packed components. Customers appreciate the multifunctional design that lets them cook eggs and pancakes on the griddle while grilling steaks on the main grates. The side burner includes a lid that keeps it clean when not in use.
Why it’s great
- Griddle and grill grate combo for versatile cooking
- Pull-out grease tray simplifies cleanup
- Lidded side burner protects from debris
- Quick 45-minute assembly time
Good to know
- Some units shipped with wrong grate configuration
- Lid-lifting mechanism reported as fragile by one customer
- Customer service response inconsistent
9. GRILL DEPOTS 3-Burner Propane Gas Grill
The GRILL DEPOTS model is the most affordable entry into the 3-burner with side burner category, offering a total of 39,000 BTU split across three main burners at 10,000 BTU each and a 9,000 BTU side burner. The cooking surface covers 369 square inches — 279 square inches primary plus 90 square inches on the warming rack — enough for small family cookouts.
The porcelain-enameled cast-iron grates provide non-stick properties and resist rust better than bare cast iron. The stainless steel finish adds a clean look, and the bottom cabinet hides the propane tank for a tidy setup. The double-layer lid locks in heat, and the cool-touch handle stays comfortable even during long grilling sessions. Built-in tool hooks and a bottle opener add convenience.
Assembly is straightforward, and customers report the grill lights easily on the first attempt. The removable grease tray and detachable grates make cleaning less time-consuming. While the build is lightweight compared to premium options, it offers solid value for those grilling occasionally or on a budget.
Why it’s great
- Budget-friendly entry point to 3-burner category
- 39,000 BTU total with 10,000 BTU per main burner
- Porcelain-enameled grates resist rust
- Cabinet hides propane tank for clean look
Good to know
- Lightweight build may not last many seasons
- 9,000 BTU side burner is on the lower side
- Warming rack is compact at 90 sq in
FAQ
Is a 3-burner grill with side burner enough for a family of four?
What BTU rating should the side burner have for simmering sauces?
How do I clean porcelain-enameled cast-iron grates without damaging them?
Can I replace the side burner with a griddle on a 3-burner gas grill?
Final Thoughts: The Verdict
For most users, the 3 burner gas grill with side burner winner is the Weber Genesis E-325 because its PureBlu burners, extra-large Sear Zone, and 641-square-inch cooking area deliver consistent high heat and long-term durability. If you want a viewing lid and knob lights for precise monitoring at a lower price, grab the Monument Grills Mesa325. And for a compact, space-saving design with foldable shelves, nothing beats the Permasteel 3-Burner.