Atosa Deep Fryers

Atosa Deep Fryers

Atosa deep fryers are one of the most popular commercial fryer families in North American kitchens. NSF and ETL Sanitation Listed construction, real recovery power, and pricing that lets independent operators buy two or three units for what a single tier-one fryer costs. Whether you are sizing an ATFS-35ES for a tight prep line, an ATFS-40 for a sandwich shop, an ATFS-50 for a sports bar, or an ATFS-75 for a high-volume restaurant, the same engineering DNA runs through every model.

Still narrowing capacity or fuel? See our commercial deep fryer collection for the broader category, the propane deep fryer collection for LP-specific detail, or the food truck equipment collection for mobile builds.

The Atosa Fryer Lineup at a Glance

Atosa builds floor-model commercial gas fryers in four primary capacities, each available in natural gas (NG) and liquid propane (LP). All four share the same core design: full stainless steel cabinet and fry tank, millivolt safety control system, oil cooling zone, standing pilot, self-reset high-temperature limit switch, 200°F to 400°F operating range, and cETLus plus ETL Sanitation Listed certification backed by a 1-year parts and labor warranty. The differences are oil capacity, burner count, BTU output, and footprint.

Notice the footprint pattern: the 35ES, 40, and 50 all share the same 15.6" wide x 30.1" deep cabinet. Only the 75 widens to 21.1" to fit five burners and the bigger fry tank. That means you can step up a size without re-engineering your line, as long as you stay at 50 lb or below.

What All Four Atosa Fryers Share

• Full stainless steel cabinet, door, and fry tank for corrosion resistance and easy sanitation
• Two nickel-plated baskets with coated handles per fryer
• Standby pilot ignition with millivolt safety valve (no 120V outlet required)
• Integrated oil cooling zone (cold zone) below the burners to trap crumb sediment, extend oil life, and reduce off-flavors
• Self-reset high-temperature limit switch that cuts gas supply if oil exceeds the safety setpoint
• Automatic voltage stabilizing safety valve
• Imported thermostat with 200°F to 400°F range
• Adjustable stainless steel legs (casters included on the ATFS-35ES)
• 3/4-inch NPT gas inlet connection
• cETLus Certified, ETL Sanitation Listed
• 1-Year Parts and Labor Warranty

The standing pilot and millivolt design means Atosa floor fryers do not need a 120V outlet to run, which is why they are common picks for food trucks, concession trailers, and pop-up kitchens.

ATFS-40: The Workhorse

The ATFS-40 is the model that put Atosa on the map in independent restaurants. 40 lb of oil, three burners, 102,000 BTU. Right for sandwich shops, taverns, small diners, food trucks, and any operation cooking 200 to 600 baskets of fries per service. The 40 lb oil capacity gives you enough thermal mass for back-to-back drops without temperature crash. Compact 15.6" width slots into most existing fryer cutouts under a Type 1 hood; millivolt design means no electrical changes at install. See the full 40 pound deep fryer collection.

ATFS-50: The Bar and Restaurant Default

The ATFS-50 steps up to 50 lb of oil and adds a fourth burner, pushing total output to 136,000 BTU. That extra burner is the difference between a fryer that handles a Friday-night rush and one that crashes on the third basket of frozen wings. The most popular fryer in casual bar-and-grill operations because it carries enough oil mass to keep temperature stable while serving simultaneous fry, wing, and tender orders. Same 15.6" cabinet footprint as the 40, so it drops into an existing ATFS-40 cutout without modification. See the full 50 pound deep fryer collection.

ATFS-75: The High-Volume Heavyweight

75 lb of oil, five burners, 170,000 BTU. Engineered for chicken concepts, fish-and-chip shops, busy sports bars, ghost kitchens running dedicated chicken oil, and any operation pulling consistent 5-to-10-pound batch loads. The 75-pounder is 5.5" wider than the 40 and 50 — verify hood throat width and that your gas line can deliver 170,000 BTU (3/4" NPT minimum) before install.

ATFS-35ES: The ENERGY STAR Efficiency Pick

The 35ES is the newest addition and the one most operators overlook. 35 lb capacity, three burners, ENERGY STAR certified. Designed to reduce gas consumption versus baseline commercial fryers without sacrificing recovery. Many utilities and state energy programs offer rebates on ENERGY STAR commercial cooking equipment; rebate availability and dollar amounts vary by utility, so check your provider's commercial equipment program before you buy. Includes four casters for mobility — helpful for cleaning the cold zone behind the fryer.

How to Choose the Right Atosa Fryer

Sizing by oil capacity is the easy part once you measure your peak basket-per-hour count:

• Under 30 baskets/hour at peak: ATFS-35ES is right-sized and the ENERGY STAR rebate pays you back
• 30 to 60 baskets/hour at peak: ATFS-40 handles it without temperature crash
• 60 to 100 baskets/hour at peak: ATFS-50 carries enough oil mass to keep recovery fast
• 100+ baskets/hour or batch loads over 3 lb: ATFS-75 is the only model that does not become the bottleneck

If you run more than one menu category through the fryer (fries plus chicken plus seafood), look at two Atosa fryers side by side rather than one larger unit. Cross-contamination between oil types is a bigger problem than capacity in mixed-menu operations.

Atosa NG vs LP: Pick Your Fuel

Every Atosa floor fryer is available in both natural gas (NG suffix) and liquid propane (LP suffix). Pick NG when your building has metered natural gas service. Pick LP for food trucks, concession trailers, outdoor catering, mobile kitchens, or any building without natural gas. Each fuel version ships from the factory with the correct orifices, regulator spring, and pilot orifice for that fuel — no field conversion needed for new installs. Field conversion between fuels requires the manufacturer conversion kit and a licensed gas technician.

The Atosa Engineering Story

Tube-Fired Burner Design

Cast iron burners fire into stainless heat-exchange tubes that run through the oil bath, transferring heat efficiently without exposing the oil to direct flame impingement. Cast iron retains heat between firings, smooths the on-off cycle of the thermostat, and outlasts stamped steel burners by years in real-world service.

The Millivolt Control System

A millivolt fryer generates its own electricity from the standing pilot flame using a thermopile. The thermopile produces enough millivoltage (typically 500 to 750 mV) to hold the main gas valve open and operate the thermostat. Practical benefit: no electrical hookup required. No outlet, no GFCI, no electrician for install. The trade-off is that the pilot runs continuously and consumes a small amount of gas — in a 24/7 operation this is rounding error; kitchens running 8 hours a day often shut the pilot off at end of service.

The Oil Cooling Zone (Cold Zone)

Every Atosa floor fryer has an integrated oil cooling zone below the burner heat-exchange tubes. Sediment, breading crumbs, and food particles that fall through the basket settle where the oil is too cool to burn or carbonize them. Three benefits: meaningfully longer usable oil life, no flavor cross-contamination between menu items (the "donuts tasting like calamari" problem), and easier cleaning — you drain cold-zone sediment during boil-out instead of constantly skimming during service. Shops running donuts as a primary product need a dedicated flat-bottom fryer; see our donut fryer collection.

Self-Reset High-Temperature Limit Switch

A separate safety device from the operating thermostat, factory-set to trip when oil exceeds 450°F. Cuts gas supply to both main burners and pilot; requires manual reset. Protects against thermostat failure, runaway heating, and oil flash-point risk.

Install Planning

Gas Supply and Connection

All four Atosa floor fryers use a 3/4" NPT gas inlet at the rear of the cabinet. Internal regulator maintains manifold pressure at 4" WC for natural gas or 10" WC for LP. Inlet supply pressure needs to be 5" to 10.5" WC for natural gas and 11" to 13" WC for propane. For the ATFS-75 at 170,000 BTU, a 3/4" black iron supply line is minimum; a 1" line is recommended if you have other gas appliances on the same branch. Use a flexible commercial gas connector, a manual shutoff valve within reach, and a sediment trap (dirt leg) on the supply side.

Type 1 Hood Required

All commercial gas deep fryers, including all Atosa ATFS models, require installation under a Type 1 (grease) hood with proper make-up air, ANSUL or equivalent fire suppression, and the inspections that go with commercial cooking equipment. A residential range hood or Type 2 (steam) hood is not adequate. For outdoor mobile installations, the food truck or trailer's installed Type 1 hood satisfies the requirement.

Leveling

Level side-to-side and front-to-back with the adjustable stainless legs (or casters on the 35ES). A fryer that sits out of level pools oil unevenly and creates hot spots in the burner array. Use a torpedo level on the basket rest at the top of the fry tank.

Maintenance Schedule

Daily

• Filter the oil at end of each service (small operations) or twice per service (high volume)
• Skim sediment off the oil surface periodically during service
• Wipe down the exterior cabinet and door with a non-abrasive stainless cleaner
• Check the pilot flame is steady and blue at end of day
• Verify the high-limit switch has not tripped

Weekly

Perform a boil-out (more often in high-volume chicken or fish operations). A controlled simmer of water and fryer cleaning solution lifts polymerized oil off tank walls and cold-zone surfaces.

Monthly

• Inspect burner ports for sooting, blockage, or corrosion. Clean with a soft brush.
• Check the pilot orifice for carbon buildup (weak or yellow pilot is the symptom).
• Inspect the gas connector and shutoff valve for wear, corrosion, or oil contamination.
• Check the cold zone drain for blockage.

Annual

Schedule annual service with a commercial gas equipment technician. Regulator pressure check, burner cleaning and adjustment, thermopile millivoltage test, high-limit calibration, safety valve inspection, gas connector and shutoff check. Annual service is the single best predictor of whether an Atosa fryer makes it to year 10 of service life.

Fryer Buying Resources

• Step up or down in capacity: 40 lb deep fryers | 50 lb deep fryers | 75 lb deep fryers
• Choose your fuel: propane deep fryers | natural gas deep fryers
• Purpose-built donut equipment: donut fryers
• Mobile builds: food truck equipment

Frequently Asked Questions About Atosa Fryers

Are Atosa deep fryers good?

Yes. Atosa fryers are widely used in commercial kitchens for reliability, performance, and value pricing.

How many burners does each Atosa fryer have?

ATFS-35ES: 3 burners. ATFS-40: 3 burners. ATFS-50: 4 burners. ATFS-75: 5 burners. Burner count scales with oil capacity to maintain consistent recovery time across the lineup.

What is the BTU rating of each Atosa fryer?

ATFS-40: 102,000 BTU. ATFS-50: 136,000 BTU. ATFS-75: 170,000 BTU. The ATFS-35ES is ENERGY STAR rated for reduced consumption versus baseline fryers.

What is the temperature range on Atosa fryers?

All Atosa floor fryers operate 200°F to 400°F, controlled by an imported thermostat with millivolt safety valve.

Are Atosa fryers NSF certified?

Yes. All Atosa floor fryers (ATFS-35ES, ATFS-40, ATFS-50, ATFS-75) are cETLus Certified and ETL Sanitation Listed, which is the NSF-equivalent third-party certification for commercial foodservice equipment.

Can I run an Atosa fryer in a food truck?

Yes. The millivolt design means no electrical hookup is needed, and the LP variants are designed for propane operation from a standard tank. The food truck's installed Type 1 hood satisfies the under-hood installation requirement. The ATFS-40-LP and ATFS-50-LP are the two most common picks for food truck builds.

What size Atosa fryer do I need?

Under 30 baskets/hour at peak: ATFS-35ES. 30 to 60 baskets/hour: ATFS-40. 60 to 100 baskets/hour: ATFS-50. 100+ baskets/hour or batch loads over 3 lb: ATFS-75.

What is the Atosa fryer warranty?

All Atosa floor fryers ship with a 1-year parts and labor warranty from the manufacturer.

What gas inlet do Atosa fryers use?

All four Atosa floor fryers use a 3/4" NPT gas inlet at the rear of the cabinet.

How long do Atosa commercial fryers last?

With proper maintenance (daily filtration, weekly boil-out, monthly burner inspection, annual professional service), Atosa floor fryers typically reach 8 to 12 years of service life. Without maintenance, expect significantly less.

Do Atosa fryers come with baskets included?

Yes. Every Atosa floor fryer ships with two nickel-plated baskets with coated handles.

Can I convert an Atosa fryer from natural gas to propane?

The fryer is delivered set up for the fuel type on the model number (NG or LP). Field conversion requires changing burner orifices, pilot orifice, and regulator spring, and must be performed by a licensed gas technician using the manufacturer conversion kit. For new installs, order the correct fuel variant from the factory.

What is the difference between the ATFS-35ES and ATFS-40?

The ATFS-35ES has 35 lb oil capacity and is ENERGY STAR rated (utility-rebate eligible). The ATFS-40 has 40 lb capacity and 102,000 BTU. Both have 3 burners and the same 15.6" wide cabinet. Pick the 35ES for rebates and lower gas consumption; pick the 40 for the extra oil mass.

What is the difference between the ATFS-50 and ATFS-75?

The ATFS-50: 50 lb, 4 burners, 136,000 BTU, 15.6" wide. The ATFS-75: 75 lb, 5 burners, 170,000 BTU, 21.1" wide. Pick the 75 for 100+ baskets/hour, batch loads over 3 lb, or chicken/fish-focused menus where recovery and oil mass matter.

Do Atosa fryers have a cold zone?

Yes. All Atosa floor fryers have an integrated oil cooling zone below the burner heat-exchange tubes that traps sediment, extends oil life, and prevents flavor cross-contamination.

Does the Atosa fryer pilot light run continuously?

Yes. Atosa floor fryers use a standing pilot with a millivolt safety valve. The pilot stays lit during operating hours, generating the millivoltage that holds the main gas valve open. Shorter-shift kitchens often shut the pilot off at end of service to reduce idle gas consumption.

Where can I buy Atosa fryer parts?

Atosa fryer parts (thermostats, baskets, pilots, burner orifices, gas valves) are available through The Restaurant Warehouse and the broader Atosa US dealer network.