Atosa ATCB-48-NG 48-inch Natural Gas Lava Rock Charbroiler

Who the ATCB-48 Is Built For

The ATCB-48 is the largest and heaviest charbroiler in the Atosa line: four 35,000 BTU burners under a bed of lava briquettes, 140,000 BTU total, on natural gas, with about 968 sq in of reversible cast iron grate at 247.8 lb. It is the steakhouse workhorse, with room to mark, cook through, rest and hold across one grill and the lava rock flavor many steak programs are built on.

It fits steakhouses and chop houses, high-volume Latin and Brazilian-style grills, supper clubs and hotel restaurants with a steak-forward menu, and banquet kitchens that grill steaks to order for large events. Four zones let one cook keep a blistering sear zone going all night while thicker cuts finish on the cooler zones.

At 247.8 lb, the ATCB-48 needs a stand or chef base rated well above its weight. If you do not need a fourth zone, the ATCB-36 saves a foot of hood and 35,000 BTU. For less upkeep, compare the radiant ATRC-48-NG.

Common fits for this model:

• Steakhouses and chop houses
• Latin and Brazilian-style grills
• Hotel restaurants and supper clubs with a steak menu
• Banquet kitchens grilling steaks to order

Is the ATCB-48 the Right Size?

The ATCB-48 is 48" wide with four 12" zones and about 968 sq in of grate. Every Atosa charbroiler uses the same 12" zone, so sizing comes down to how many zones your busiest hour needs at the same time: one to sear, one to cook through, and ideally one to hold.

How much fits on the 48" grate

Estimated full-grate counts with room to flip. In real service, plan on about two-thirds to three-quarters of these numbers, because a zone is usually kept for holding or cooler cooking.

Compare the other lava rock sizes

ATCB-48 vs. ATRC-48-NG: Lava Rock or Radiant

The ATCB-48 and the radiant ATRC-48-NG share the same burners, BTU, grates, work area and footprint. The difference is what sits between the flame and the food. Lava rock holds heat and catches drippings, which flare and smoke back into the food for a heavier char. Radiants give cleaner, more even heat and less flare-up, with less upkeep.

Zones and Grates on the ATCB-48

Each 12" section has its own 35,000 BTU burner, standby pilot and manual control. The knob sets the flame size, not a temperature, so cooks control results by zone: turn one up to sear, another down to cook through, and keep one low or off to rest and hold. Turning off zones you are not using during slow periods is also the easiest way to save gas.

Reversible, adjustable grates. Per Atosa's manual, one side of each cast iron grate has a grease trough and the other side is flat. Use the trough side up for fatty foods like burgers, ribeyes and chicken thighs, so fat drains to the catch tray instead of flaring. Use the flat side for fish, vegetables and delicate items. The grates can also be angled to move grease toward the trough or to cook a little cooler at the high end.

Building a Steak Program on the ATCB-48

Cuts that suit a lava rock charbroiler

Zone layout for steak service

Grill Marks, Crust and Doneness

• Dry, seasoned surface. Pat steaks dry and season just before grilling or well ahead (dry-brining). A wet surface steams instead of searing.
• Hot, clean grates. Preheat 15 to 20 minutes, as Atosa recommends, and scrape the grate before every load.
• Crosshatch marks. Set the steak at about a 45° angle to the bars, let it sear, then rotate a quarter turn on the same side. Flip and repeat if both sides are presented.
• Do not press. Pressing squeezes out juice, which also feeds flare-ups on lava rock.
• Use a thermometer. Probe the thickest part, away from bone.

Common doneness targets

Restaurant kitchens commonly use targets like these for the final temperature after resting. Pull a few degrees early; thick steaks continue to rise while they rest (carryover cooking).

Food safety. The USDA recommends 145°F with a 3-minute rest for whole cuts of beef, and the FDA Food Code standard for whole-muscle meat is 145°F for 15 seconds. Serving steaks below that is allowed where your health department permits it, usually with a consumer advisory on the menu. Check your local rules.

Resting and slicing

Rest steaks on the cool zone or a warm plate for several minutes, longer for thick bone-in cuts. Slice against the grain for sliced service, and plate on warm plates so the steak does not cool on the pass.

Cleaning Cast Iron After Steak Service

Steak service leaves heavy, sugary-fatty carbon on the grates and saturates lava rock faster than a mixed menu. The routine:

1. Burn off on high for a few minutes, then turn all controls to "0".
2. Once cool, wearing insulated gloves, lift the grates, wire-brush them and scrape the slots.
3. Clean and oil the back support brace; clean the catch tray and wipe it with oil.
4. Oil the grates; per Atosa, run the grill open for 45 minutes, uncovered, to bake it in.
5. Turn the lava rock regularly and replace it when it is saturated and flaring constantly.

Never hose down or pressure wash the grill, never soak the grates, and never use abrasive or corrosive cleaners. Those rules come from Atosa's manual.

Natural Gas Setup and Gas Use

The ATCB-48 is set up for natural gas, with the supplied regulator set at 4" W.C. and a 3/4" NPT rear gas connection. The main burner orifices are #36 for natural gas in Atosa's charbroiler specifications. If your kitchen runs on propane, the radiant ATRC-48-LP comes ready for it.

Estimates use about 1,000 BTU per cubic foot of natural gas, 100,000 BTU per therm and about 21,500 BTU per pound of propane. Real use is lower when zones are turned down or off.

Gas conversion. Atosa's manual says the main burner orifices are installed at the factory and that switching gas means changing the orifices and the regulator setting, work that must be done only by authorized, licensed technicians. Do not attempt a conversion yourself.

Before You Order the ATCB-48

• Gas at the hookup: confirm you have natural gas at the cooking line. This listing is the natural gas model.
• Space: 48" wide x 27-3/5" deep, plus 6" at each side and the back. Measure about 60" of open, non-combustible counter or stand.
• Hood: the hood must cover the full 48" width with the overhang your code requires. Confirm with your code official before delivery.
• Gas supply: make sure your gas piping and meter can add 140,000 BTU/hr on top of the rest of the line. Ask your plumber or gas fitter.
• Connector: a commercial flexible gas connector sized for the load, with a quick disconnect and a restraining cable where code requires one.
• Support: a stand or chef base rated above 247.8 lb.
• Installer: book a licensed gas technician for install day.
• Delivery: the shipping weight is 313.7 lb. Plan who will receive and inspect the freight, and note any damage with the driver.

ATCB-48 Specifications

Installing the ATCB-48

From Atosa's charbroiler manual:

• Installation, adjustment and gas work by an authorized, licensed technician, to local code (or ANSI Z223.1/NFPA 54 where there is none). Otherwise the manufacturer may refuse warranty service.
• A level, solid, non-skid, non-combustible surface, away from customers and children.
• At least 6" clearance on both sides and the back and 4" underneath. With side clearance, plan about 60" of counter width.
• Install under an exhaust hood as local regulations require. Gas underfired broilers are classed as heavy-duty cooking appliances under the International Mechanical Code; confirm hood and fire suppression with your local code official.
• Screw in the 4 adjustable legs and level the unit. Lift it rather than dragging it.
• Spread the lava rock evenly on the bottom frame (pieces about 3 to 5 cm) after confirming the fire shields are in place.
• Leak-test every gas joint with soapy water or a detector, never a flame, and have the technician check working gas pressure.
• Disconnect the appliance shutoff valve during supply pressure tests above 1/2 psi (3.45 kPa).
• Keep fans and air conditioning from blowing on the flame. Do not use outdoors.

Stand or chef base. At 247.8 lb net, the ATCB-48 needs a non-combustible stand or a chef base rated for countertop cooking equipment, with capacity above the grill's weight. All Atosa charbroilers stand 15-1/5" tall, the same as Atosa's ATTG and ATMG countertop griddles, so a matched line sits level.

First-Day Setup

1. Level the grill and seat the catch tray.
2. Wipe it down with a mild detergent. No corrosive or abrasive cleaners.
3. With all knobs at "0", light the pilots. The first light can take a minute while air clears from the line.
4. Turn each knob counterclockwise to light the burners from the pilots.
5. Burn in: the first heat-up smokes as protective oil burns off. Atosa says it clears after about an hour at maximum. Run the hood and cook nothing during the burn-in.
6. Season the grates: oil them and run the grill open for 45 minutes, uncovered.
7. Preheat 15 to 20 minutes before each service.
8. After shutting off a main burner, wait more than 5 minutes before relighting it.

Daily Care

Turn off all valves and let the grill cool before cleaning. Do not hose down, immerse or pressure wash any part except the catch tray. Have the grill inspected by an authorized, licensed technician at least once a year.

Troubleshooting the ATCB-48

Adapted from Atosa's troubleshooting table. If anything goes wrong, stop using the grill and have a technician check it.

If you smell gas, shut off the main gas valve, put out all flames and call 911.

ATCB-48 FAQ

How many BTU is the ATCB-48?

140,000 BTU total from four 35,000 BTU burners on natural gas.

What size is the ATCB-48?

48" wide, 27-3/5" deep and 15-1/5" tall, with a 47-9/10" x 20-1/5" work area (about 968 sq in). It weighs 247.8 lb.

Does the ATCB-48 need a hood?

Yes. Atosa's manual requires installation under an exhaust hood per local regulations. Confirm hood and fire suppression requirements with your local code official.

How much clearance does it need?

At least 6" on both sides and the back and 4" underneath, on a non-combustible surface. Plan about 60" of counter width.

What gas connection does it need?

A 3/4" NPT rear connection; the supplied regulator is set at 4" W.C. for natural gas.

How do I season the grates?

Clean them, coat them with cooking oil and run the grill open for 45 minutes without covering the grates, per Atosa's manual.

Can I use it outdoors?

No. Atosa's manual says not to use the charbroiler outdoors.

What is the warranty?

1 year parts and labor, US only. Licensed installation and manufacturer parts are required to keep coverage.

Is the ATCB-48 good for a steakhouse?

Yes. Four 35,000 BTU zones give room to sear, finish and rest at different heats, and lava rock adds the flare-up char many steak programs are known for.

What temperature should steaks be cooked to?

Kitchens commonly target about 130-135°F final for medium-rare. The USDA recommends 145°F with a 3-minute rest, and the FDA Food Code standard for whole-muscle meat is 145°F for 15 seconds; lower temperatures require your health department's consumer advisory rules.

Compare every model in our commercial charbroiler guide. Questions? Call or text 206-419-5801.