Commercial Charbroiler Buying Guide: Radiant vs Lava Rock, BTU, Width and Grate Height

A commercial charbroiler is a gas grill with burners under cast iron grates: the drippings hit something hot, vaporize, and the smoke that comes back up is the flavor. Everything else about buying one comes down to three decisions — what sits between the burner and the grate, how wide the unit needs to be, and how high off the flame you can set the grates.

1. Charbroiler, chargrill, commercial grill

Charbroiler, char broiler, chargrill and charbroiler grill all name the same equipment. So, most of the time, does "commercial grill" — though that phrase is looser, and some people use it for a griddle, which is a different machine entirely.

2. Radiant or lava rock

Both designs put something between the burner and the grate to spread heat and catch drippings. What that something is changes how the grill behaves and how much work it is:

Lava rock has its advocates — the flare-ups are part of the flavor, and some kitchens want them. But for most operations the radiant design wins on the two things that matter across a long service: the heat stays where you put it, and cleanup at the end of the night is a scrape rather than a rebuild. Every Flamaster charbroiler here is a radiant unit with a U-burner under each 12 inches of grate.

3. What the BTU number actually tells you

People compare charbroilers on total BTU and assume more means hotter. It does not. Look at what happens across the range:

The heat per square inch is identical. One U-burner and 35,000 BTU serve every 12 inches of width, all the way up. A 48" unit does not sear harder than a 12" one — it sears the same, on four times as much grate.

So the total BTU figure is really a restatement of the width, and it is useful for exactly one thing: sizing your gas supply. When you compare two charbroilers of the same width and one claims a much higher total BTU, that is the comparison worth investigating — across a single manufacturer's own line, it usually just means a bigger grill.

4. Width: size by covers, not by ambition

The cooking surface is 20 inches deep on every model, so width alone sets your capacity. Think in terms of what sits on the grate at once during your worst fifteen minutes, not your average hour:

• 12" — a food truck, a coffee counter adding paninis and chicken, a bar menu with two grilled items. One burner, and it is genuinely countertop-sized.
• 24" — a small restaurant or a single grill station. Room to keep two zones going: searing on one half, holding or finishing on the other.
• 36" — the common choice for a busy fast-casual line. Three burners means three independent zones, which is what makes a mixed menu workable on one piece of equipment.
• 48" — steakhouse and high-volume service, where the constraint is how many steaks can be down at the same moment.

5. Grate height is the control you will use most

The cast iron grates on these units are reversible and adjustable to three heights. This is the feature most buyers skip in the spec sheet and then use every single day:

• Grate low, close to the flame — hard sear, fast char, steaks and burgers.
• Grate high — gentler cooking for chicken on the bone, fish and vegetables that would burn outside before cooking through.
• Flip the grate over — one face is shaped for searing meat and leaving defined lines, the other for delicate items that need more support.

Between three burner settings, three heights and two grate faces, one 36" charbroiler covers a much wider menu than its footprint suggests.

6. The models

All four are countertop units, 28 7/10" deep and 15 3/4" tall on 4" legs, with a 20" deep cooking surface, reversible three-height cast iron grates, 430 stainless steel body, CSA design certified and NSF listed, 3/4" gas inlet at 5 1/2", configurable for natural gas or LP, 1-year warranty:

7. Gas, hood and clearance

• Confirm the gas line can carry it. 140,000 BTU per hour on the 48" unit is a real load on a shared line — check it against everything else on the cook line before you commit to the larger size.
• The inlet is 3/4", sitting 5 1/2" off the counter. Measure against your existing connection.
• It must sit under a Type I hood. A charbroiler produces grease-laden vapor by design — that is what the smoke flavor is. This is not optional and not a step to defer.
• It is 28 7/10" deep. On a standard 30" counter that leaves almost nothing behind it, so plan where the gas connection runs.
• Countertop does not mean light. 102 lb to 269 lb — confirm what your counter or equipment stand is rated to carry.

Keeping the grates alive

• Every shift: brush the grates hot, pull the grease tray, empty and wipe it.
• Weekly: lift the grates and radiants out, scrape and wash them, and check the burner ports are firing evenly along their length. An uneven flame is nearly always a blocked port, not a failing burner.
• Season the cast iron with a light oil after cleaning. Bare cast iron rusts, and rusted grates stick, which is how grates get replaced years before they should be.
• Monthly: check the gas connection and the control valves.

8. Before you order

• Charbroiler or griddle — decide from the menu, and be honest about whether you need both.
• Count burners, not inches. Independent zones are what make a mixed menu work.
• Ignore total BTU as a heat measure and use it only to size the gas supply.
• Confirm your gas type and have the unit configured accordingly.
• Measure 28 7/10" of counter depth, and the 5 1/2" inlet height against your stub-out.
• Confirm the Type I hood covers the footprint with the required overhang.
• Have a licensed gas fitter make the connection.