Atosa Fryer Guide: ATFS-35ES, ATFS-40, ATFS-50, and ATFS-75 Compared

The Atosa fryer line is one of the most popular Atosa commercial fryer families in North American kitchens, and for good reason. Atosa builds gas floor fryers that hit a sweet spot the major brands miss: 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 up an ATFS-35ES (also written ATFS 35ES) for a tight prep line, an Atosa commercial deep fryer like the 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. This Atosa fryer guide and review walks the full Atosa fryer lineup, side-by-side specs, fuel options, the millivolt control system, oil cooling zone, and where each model fits in your kitchen.

If you are still narrowing fuel type, capacity, or whether a fryer belongs indoors or in a mobile setup, our commercial deep fryer buyer guide covers the broader category. For mobile operators, see the food truck fryer guide. To compare fuels head-to-head, see the propane deep fryer guide.

The Atosa Fryer Lineup at a Glance: Atosa Fryer Specs and Specifications

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 fundamental design: full stainless steel cabinet and fry tank, millivolt safety control system, oil cooling zone (cold zone), standby pilots, self-reset high-temperature limiting safety device, 200°F to 400°F operating range, and cETLus plus ETL Sanitation Listed certifications backed by a 1-year parts and labor warranty. The differences come down to oil capacity, burner count, BTU output, and footprint.

Atosa Fryer Specifications Side-by-Side: BTU, Dimensions, and Burner Count

Here is how the four primary Atosa gas fryers compare on the Atosa fryer dimensions and Atosa fryer BTU ratings that drive sizing decisions:

• ATFS-35ES (ENERGY STAR): Atosa 35 lb (Atosa 35 pound) oil capacity, 3 burners, ENERGY STAR rated Atosa energy star fryer, 15-3/5"W x 30-1/10"D x 44-2/5"H, NG and LP versions
• ATFS-40: Atosa 40 lb (Atosa 40 pound) oil capacity, 3 burners, 102,000 BTU, 15-3/5"W x 30-1/10"D x 44-2/5"H, NG and LP versions
• ATFS-50: Atosa 50 lb (Atosa 50 pound) oil capacity, 4 burners, 136,000 BTU, 15-3/5"W x 30-1/10"D x 44-2/5"H, NG and LP versions
• ATFS-75: Atosa 75 lb (Atosa 75 pound) oil capacity, 5 burners, 170,000 BTU, 21-1/10"W x 30-1/10"D x 44-2/5"H, NG and LP versions

Notice the footprint pattern: the 35ES, 40, and 50 all share the same 15.6" wide by 30.1" deep cabinet. Only the 75 widens to 21.1" because it has to fit five burners and the bigger fry tank. That means you can drop in a bigger Atosa fryer without re-engineering your line as long as you stay at 50 lb or below. Browse the full lineup at the Atosa deep fryers collection.

What All Four Atosa Stainless Steel Fryers Share

Every Atosa floor gas fryer (35ES through 75) ships with these baseline features. The full Atosa fryer baskets, Atosa fryer burner array, Atosa fryer thermostat, and Atosa fryer pilot system are consistent across the line:

• 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 electrical hookup required for ignition or temperature control)
• 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 high-quality thermostat with 200°F to 400°F range
• Adjustable stainless steel legs (casters available on the 35ES)
• 3/4-inch NPT gas inlet connection
• cETLus Certified, ETL Sanitation Listed
• 1-Year Parts and Labor Warranty

The standby 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 where electrical capacity is limited.

Atosa ATFS-40: The Workhorse Atosa Commercial Fryer

The ATFS-40 is the model that put Atosa on the map in independent restaurants. It is the right size 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, and the three-burner 102,000 BTU configuration is genuinely fast at recovering between loads.

Watch the ATFS-40 in action:

ATFS-40 Specifications

• Oil capacity: 40 lb
• Burners: 3
• Total BTU: 102,000
• Temperature range: 200°F to 400°F
• Dimensions: 15-3/5"W x 30-1/10"D x 44-2/5"H
• Construction: Full stainless steel
• Gas inlet: 3/4" NPT
• Available in: ATFS-40-NG (natural gas) and ATFS-40-LP (propane)
• Certifications: cETLus, ETL Sanitation Listed
• Warranty: 1-Year Parts and Labor

Who Should Buy the ATFS-40

The ATFS-40 fits operations that want commercial-grade frying without the bulk of a 50 lb or 75 lb tank. Typical buyers include sandwich and burger shops adding fried sides, taverns and sports bars running wings and basket apps, food trucks and trailers cooking 4 to 6 hours per service, ghost kitchens dedicating one fryer per oil type (chicken vs. fries), and seasonal pop-ups. The compact 15.6" width means it slots into most existing fryer cutouts under a Type 1 hood, and the millivolt design means no electrical changes are needed during install.

ATFS-40 LP vs NG: Which Should You Pick?

The ATFS-40-LP and ATFS-40-NG are identical units with different orifice and regulator configurations from the factory. Pick LP if you operate from a food truck, concession trailer, outdoor event setup, or any kitchen without a natural gas hookup. Pick NG if you have a commercial building with metered natural gas service. Atosa ships the fryer set up for the fuel type on the model number, so you do not need to convert in the field. If your fuel situation changes later, refer to your Atosa fryer troubleshooting guide for service procedures.

Atosa ATFS-50: The Atosa Fryer for Bar and Restaurant Service

The ATFS-50 steps up to a 50 lb oil capacity and adds a fourth burner, pushing total output to 136,000 BTU. That extra burner is the difference between a fryer that can handle a Friday-night rush and a fryer that hits temperature crash on the third basket of frozen wings. The 50-pounder is 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.

See the ATFS-50 walkthrough:

ATFS-50 Specifications

• Oil capacity: 50 lb
• Burners: 4
• Total BTU: 136,000
• Temperature range: 200°F to 400°F
• Dimensions: 15-3/5"W x 30-1/10"D x 44-2/5"H
• Construction: Full stainless steel
• Gas inlet: 3/4" NPT
• Available in: ATFS-50-NG (natural gas) and ATFS-50-LP (propane)
• Certifications: cETLus, ETL Sanitation Listed
• Warranty: 1-Year Parts and Labor

Why the ATFS-50 Outsells the 40 in Bars

Three reasons. First, the additional 10 lb of oil mass directly extends frying capacity between filtrations and reduces the temperature drop per basket drop. Second, the fourth burner shortens recovery time between loads, which is the metric that actually defines real-world output, not "rated capacity." Third, the 50 fits the same 15.6" cabinet footprint as the 40, so if a kitchen was specified for an ATFS-40 cutout, the 50 drops right in without modification. The ATFS-50-LP is the most-shipped Atosa fryer in food truck and trailer builds for exactly this reason.

Atosa Fryer Recovery: ATFS-50 vs the ATFS-40

Atosa fryer recovery time is how quickly the fryer climbs back to setpoint after a cold basket drop. The ATFS-50 recovers faster than the ATFS-40 for two compounding reasons: the additional 10 lb of oil mass means a basket drop pulls a smaller percentage of the total thermal load, and the fourth burner adds direct heating capacity. The practical result is shorter pauses between drops, which is the metric that actually defines real-world throughput in bar and casual-dining service. Across a full 8-hour service, that faster-recovery advantage is what lets the same fryer station ship more product without adding labor.

Atosa ATFS-75: The High-Volume Heavyweight

The ATFS-75 is the fryer you specify when capacity stops being a question and recovery becomes the constraint. With 75 lb of oil, 5 burners, and 170,000 BTU of total heating power, the ATFS-75 is 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 through service.

Watch the ATFS-75 commercial fryer:

ATFS-75 Specifications

• Oil capacity: 75 lb
• Burners: 5
• Total BTU: 170,000
• Temperature range: 200°F to 400°F
• Dimensions: 21-1/10"W x 30-1/10"D x 44-2/5"H
• Construction: Full stainless steel
• Gas inlet: 3/4" NPT
• Available in: ATFS-75-NG (natural gas) and ATFS-75-LP (propane)
• Certifications: cETLus, ETL Sanitation Listed
• Warranty: 1-Year Parts and Labor

When the 75-Pounder Is the Right Call

The ATFS-75 makes sense for chicken-focused concepts where you bread, dredge, and drop in 5-pound increments. It makes sense for fish-and-chip operations where the batter-laden batch drops the oil temperature hard and you need the burner BTU to recover before the next order. It makes sense for high-volume bars running wings as a featured menu category. It does not make sense for sandwich shops, low-volume diners, or food trucks below the trailer-class size, because you will not turn the oil fast enough to keep it fresh and the extra capacity is paid for in oil cost.

Atosa Fryer Cooking Performance on the ATFS-75

Real-world cook times depend on oil age, batch size, starting product temperature, and the specific menu item, so the right reference is always your own line test rather than a published table. What the 170,000 BTU output buys you on the ATFS-75 is consistent recovery between drops, even on heavy batter or breading loads where the cold product pulls oil temperature down hard. The five-burner array is designed so that the fryer is not the bottleneck in a high-volume kitchen running back-to-back drops through service.

ATFS-75 Footprint Considerations

The 75-pounder is 5.5 inches wider than the 40 and 50, which matters at install. If you are replacing an ATFS-40 or ATFS-50 with an ATFS-75, verify your hood throat is wide enough, your gas line can deliver 170,000 BTU (3/4" NPT minimum), and your existing fryer station has 21-1/10" of clear cabinet width plus appropriate clearance to combustibles. ATFS-75-LP and ATFS-75-NG are the two fuel variants.

Atosa ATFS-35ES: The ENERGY STAR Fryer Efficiency Pick

The ATFS-35ES is the newest addition to the Atosa floor fryer lineup and the one most operators overlook. It is a 35 lb capacity, three-burner gas floor fryer with ENERGY STAR certification, designed to reduce gas consumption versus baseline commercial fryers without sacrificing recovery performance. The ES in the model number stands for ENERGY STAR.

Atosa ATFS-35ES Specs and Specifications

• Oil capacity: 35 lb
• Burners: 3
• ENERGY STAR Rated
• Temperature range: 200°F to 400°F
• Dimensions: 15-3/5"W x 30-1/10"D x 44-2/5"H
• Construction: Full stainless steel
• Casters: (4) included for mobility
• Available in: ATFS-35ES-NG (natural gas) and ATFS-35ES-LP (propane)
• Certifications: cETLus, ETL Sanitation Listed, ENERGY STAR
• Warranty: 1-Year Parts and Labor

Why an ENERGY STAR Fryer Matters on a Commercial Line

ENERGY STAR fryers are designed to deliver meaningfully better energy efficiency than baseline open-pot commercial fryers, and that advantage compounds for any fryer running long daily shifts. Many utilities and state energy programs also offer rebates on ENERGY STAR commercial cooking equipment, which can offset part of the upfront cost. Rebate availability and dollar amounts vary by utility, so check your provider's commercial equipment rebate program before you buy. The ATFS-35ES-LP propane variant and ATFS-35ES-NG natural gas variant are typically eligible in participating ENERGY STAR utility territories; confirm with your local utility for the current program rules.

Who Buys the ATFS-35ES

The 35ES is a fit for operators in three categories. First, kitchens in jurisdictions where the local utility offers commercial-cooking rebates on ENERGY STAR equipment (rebate amounts vary by utility, so check your provider's commercial equipment program before you order). Second, operators tracking energy intensity for sustainability certifications or franchise reporting. Third, low-to-medium volume kitchens where the slightly smaller 35 lb capacity is actually right-sized and the energy savings compound over the equipment life. The (4) casters included are also a notable advantage for kitchens that need to roll the fryer for cleaning the cold zone behind it.

How to Choose the Right Atosa Fryer for Your Kitchen: Atosa Fryer Comparison

Picking the right Atosa model comes down to three variables: how many baskets per hour you cook at peak, what menu items you fry, and what your fuel and electrical situation looks like.

The Best Atosa Fryer for Your Volume: Match Capacity to Service

Sizing by oil capacity is the easy part once you measure your peak. A simple rule of thumb:

• Under 30 baskets per hour at peak: ATFS-35ES is right-sized and the ENERGY STAR rebate pays you back
• 30 to 60 baskets per hour at peak: ATFS-40 handles it without temperature crash
• 60 to 100 baskets per hour at peak: ATFS-50 carries enough oil mass to keep recovery fast
• 100+ baskets per 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), you should be looking at two Atosa fryers side by side rather than one larger unit. Cross-contamination between oil types (fish oil tainting fries, allergen issues with shared oil) is a bigger problem than capacity in mixed-menu operations.

Pick Your Atosa Fryer Fuel: Atosa NG Fryer vs Atosa LP Fryer (Atosa Natural Gas Fryer vs Atosa Propane Fryer)

Every Atosa floor fryer is available in both natural gas (NG suffix, the Atosa natural gas fryer variant) and liquid propane (LP suffix, the Atosa propane fryer or Atosa LP fryer variant, sometimes searched as Atosa NG fryer for the natural gas side). 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 service. Each fuel version ships from the factory with the correct orifices, regulator spring, and pilot orifice for that fuel, so you do not need to perform a conversion in the field for new installs. For more on the fuel decision, see our propane deep fryer guide and the commercial outdoor deep fryer guide.

Atosa Fryer for Food Truck, for Restaurant, and for Bar: Indoor Under-Hood vs Mobile

All Atosa ATFS gas fryers are NSF-certified for indoor commercial use under a Type 1 hood, which is why operators searching for an NSF fryer, an ETL fryer, or an ETL Sanitation Listed fryer end up here. An Atosa fryer for food truck use, an Atosa fryer for restaurant lines, and an Atosa fryer for bar service all share the same code path: the unit must operate under a Type 1 hood. Food trucks and concession trailers count as "indoor under-hood" for code purposes because the trailer's installed Type 1 hood satisfies the NSF and code requirement. Do not run an Atosa floor fryer in residential settings, open-patio setups without a hood, or any environment lacking proper ventilation and fire suppression. For mobile fryer configurations, the food truck fryer setup guide covers hood, gas, and clearance requirements.

Footprint and Hood Compatibility

Three of the four models (35ES, 40, 50) share a 15.6" wide cabinet. Only the ATFS-75 widens to 21.1". If you are sizing a fryer station in a new build, plan for the 75's wider footprint even if you start with a 40 or 50, so you have upgrade headroom. If you are dropping a fryer into an existing line, measure the cutout and verify the hood throat. Atosa fryers stand 44-2/5 inches tall on the supplied stainless legs, which is the standard commercial counter height.

The Atosa Engineering Story

Understanding why Atosa fryers cost what they cost (and why they perform the way they perform) starts with the engineering choices Atosa made on three core systems: the burner array, the millivolt control, and the cold zone.

Tube-Fired Fryer Burner Design

The Atosa tube-fired fryer design uses cast iron burners with a tube-fired heat exchange path. The burners fire into stainless heat exchange tubes that run through the oil bath, transferring heat efficiently from the flame to the oil without exposing the oil to direct flame impingement. Cast iron retains heat between firings, smooths out the on-off cycle of the thermostat, and outlasts stamped steel burners by years in real-world service. This is one of the reasons Atosa fryers run quietly and recover predictably even at the entry-price tier.

The Millivolt Fryer Control System and Standing Pilot Fryer Design Explained

A millivolt fryer like the Atosa uses a gas valve and ignition system that generates its own electricity from the standing pilot flame using a thermopile. This is what makes the Atosa a standing pilot fryer in the technical sense. The thermopile produces enough millivoltage (typically 500 to 750 mV) to hold the main gas valve open and operate the thermostat. The practical benefit: no electrical hookup is required. No outlet, no GFCI, no electrician for install. You connect the gas line and the fryer is ready. This is why Atosa floor gas fryers are the default pick for food trucks, concession trailers, off-grid catering setups, and any building where pulling new electrical service is expensive or impossible.

The trade-off versus an electronic-ignition fryer is that the pilot runs continuously and consumes a small amount of gas. In a 24/7 operation this is rounding error; in a kitchen that runs 8 hours a day, you may choose to shut the pilot off at end of service to save a few cents of gas per day.

The Oil Cooling Zone (Atosa Fryer Cold Zone)

Every Atosa floor fryer has an integrated oil cooling zone, sometimes called a cold zone, below the burner heat-exchange tubes. The cold zone is a section of the fry tank that sits below the main heated zone. Sediment, breading crumbs, and food particles that fall through the basket settle into the cold zone where the oil temperature is too low to burn or carbonize them.

This matters for three reasons:

• Oil life: sediment that would otherwise burn at 350°F and turn the oil dark and bitter instead settles harmlessly into the cold zone. The result is meaningfully longer usable oil life versus open-pot fryers without a cold zone.
• Food quality: trapped sediment does not get pushed back up into the cooking zone, so your fries do not taste like the last batch of breaded chicken (the "donuts tasting like calamari" problem). For shops running donuts as a primary product, a dedicated flat-bottom fryer is the correct tool. See the doughnut fryer guide for tank geometry and oil capacity detail.
• Cleaning: you drain the cold zone sediment during boil-out instead of constantly skimming the surface during service. See the fryer boil-out procedure guide for step-by-step instructions.

Self-Reset High-Temperature Limit Switch

Every Atosa floor fryer includes a high-temperature limit switch (sometimes called a high-limit or safety thermostat). This is a separate safety device from the operating thermostat. The high-limit is factory-set to trip when oil exceeds 450°F (232°C), well above the 200 to 400 degree F operating range. When it trips, it cuts gas supply to both the main burners and the pilot, and the operator must manually reset before the fryer can light again. The high-limit protects against thermostat failure, runaway heating, and oil flash-point risk. After the oil cools below 400°F, the reset button (located behind the front door) can be engaged. The high-limit is one reason Atosa fryers carry full ETL Sanitation Listing.

Atosa Fryer Install and Installation Planning

Atosa fryer install and Atosa fryer installation are designed to be straightforward, but the planning needs to happen before delivery. Here is what to check and prep.

Gas Supply and Connection

All four Atosa floor fryers (35ES through 75) use a 3/4-inch NPT gas inlet connection at the rear of the cabinet. The Atosa ATFS series ships with an internal pressure regulator that maintains the manifold pressure at the factory setpoint: 4" WC (water column) for natural gas and 10" WC for liquid propane. 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-inch black iron supply line is the minimum, and a 1-inch line is recommended if you have other gas appliances on the same branch. Use a flexible gas connector listed for commercial cooking equipment, a manual shutoff valve within reach, and a sediment trap (dirt leg) on the supply side. Have the install inspected by your local gas utility or licensed plumber per code.

Clearance to Combustibles

Atosa publishes minimum clearance requirements in the installation and operator's manual that ships with the fryer. Required clearance depends on whether the adjacent surface is combustible or non-combustible and is generally smaller for non-combustible side walls than for combustible ones. Always defer to your specific model's installation manual and to local code, which can be stricter than the manufacturer baseline.

Type 1 Hood Required

All commercial gas deep fryers, including all Atosa ATFS models, require installation under a Type 1 (grease) hood with appropriate make-up air, ANSUL or equivalent fire suppression, and the inspections that go with commercial cooking equipment. A residential range hood or a Type 2 (steam) hood is not adequate. If your facility lacks a Type 1 hood, that is a capital expense that needs to be on the project budget before the fryer arrives. For outdoor mobile installations, the food truck or trailer's installed Type 1 hood satisfies the requirement.

Leveling and Final Placement

Once the fryer is in place, level it side-to-side and front-to-back using the adjustable stainless legs (or casters on the 35ES). A fryer that sits out of level will pool oil unevenly in the tank and create hot spots in the burner array. Use a torpedo level on the basket rest at the top of the fry tank.

Atosa Fryer Maintenance and Cleaning

An Atosa fryer that gets properly maintained will run reliably for years. An Atosa fryer that gets neglected will start throwing temperature swings, pilot-light issues, and burner sooting inside the first year. The maintenance schedule is straightforward.

Daily Atosa Fryer Cleaning and Maintenance

• 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 (it should never trip in normal operation; if it has, investigate before relighting)

Weekly Atosa Fryer Maintenance: The Boil-Out

Once a week (more often in high-volume chicken or fish operations), perform a boil-out to clean the fry tank of carbonized residue and sediment that filtration alone cannot remove. The boil-out is a controlled simmer of water and fryer cleaning solution in the empty fry tank, which lifts polymerized oil off the tank walls and the cold zone surfaces. See the full step-by-step boil-out procedure for the method that works on Atosa fryers.

Monthly Atosa Fryer Maintenance

• Inspect burner ports for sooting, blockage, or corrosion. Clean with a soft brush if needed.
• Check the pilot orifice for carbon buildup. A weak or yellow pilot flame is the symptom.
• Test the high-limit switch reset by deliberately heating above setpoint under supervision, or have it tested at annual service.
• Inspect the gas connector and shutoff valve for wear, corrosion, or oil contamination.
• Check the cold zone drain for blockage. Cold zone debris should clear cleanly during boil-out.

Annual Atosa Fryer Service

Schedule annual service with a commercial gas equipment technician. They will check the regulator pressure, clean and adjust burners, verify the thermopile millivoltage, test the high-limit calibration, inspect the safety valve, and check the gas connector and shutoff. Annual service is the single best predictor of whether an Atosa fryer makes it to year 10 of service life. For troubleshooting between annual services, the Atosa fryer troubleshooting guide covers the common symptoms (pilot won't stay lit, slow recovery, uneven temperature, etc.).

Atosa ATFS Series Technical Specifications and Installation Reference

This section provides the full Atosa ATFS series technical specifications, comparative dimensional data, and installation, calibration, and maintenance procedures for the ATFS-40, ATFS-50, and ATFS-75 commercial floor fryers. The ATFS-35ES ENERGY STAR fryer shares the same chassis dimensions and gas connection profile as the ATFS-40 with a 35 lb oil capacity. The data below is drawn from the Atosa manufacturer documentation that ships with each fryer.

Atosa ATFS-40 Technical Specifications

The ATFS-40 is a standard-width deep fryer with a three-burner configuration engineered for medium-volume frying applications and kitchens with limited floor space.

Technical Specification	Data
Model Number	ATFS-40
Oil Capacity	40 lbs
Total BTU/h	102,000
Burner Count	3 Burners (34,000 BTU each)
Temperature Range	200°F to 400°F
Width	15.6 inches
Depth	30.1 inches
Height (Working / Total)	36.25" / 44.4"
Gas Connection	3/4 inch NPT (rear)
Manifold Pressure (NG)	4" WC
Manifold Pressure (LP)	10" WC
Construction	Stainless steel tank and front
Net Weight	131 lbs

The ATFS-40 features a large cold zone at the base of the fry tank that captures food particles and prevents carbonization, which preserves oil quality over extended operational periods. The unit operates without an electrical connection, relying on a millivolt thermostat and a standing pilot light.

Atosa ATFS-50 Technical Specifications

The ATFS-50 increases thermal capacity with a four-burner system in the same chassis width as the ATFS-40. This allows higher throughput and faster recovery without increasing the horizontal footprint of the cook line.

Technical Specification	Data
Model Number	ATFS-50
Oil Capacity	50 lbs
Total BTU/h	136,000
Burner Count	4 Burners (34,000 BTU each)
Temperature Range	200°F to 400°F
Width	15.6 inches
Depth	30.1 inches
Height (Working / Total)	36.25" / 44.4"
Gas Connection	3/4 inch NPT (rear)
Manifold Pressure (NG)	4" WC
Manifold Pressure (LP)	10" WC
Construction	Stainless steel tank and front
Net Weight	143 lbs

Thermal transfer in the ATFS-50 runs through four heavy-duty stainless steel heat-exchange tubes. The increased oil volume and BTU output make the 50 well-suited to heavy protein frying and high-moisture frozen products.

Atosa ATFS-75 Technical Specifications

The ATFS-75 is the high-capacity variant in the series with a wider tank and a five-burner assembly, designed for maximum throughput in high-volume operations such as chicken concepts, fish-and-chip kitchens, and large sports bars.

Technical Specification	Data
Model Number	ATFS-75
Oil Capacity	75 lbs
Total BTU/h	170,000
Burner Count	5 Burners (34,000 BTU each)
Temperature Range	200°F to 400°F
Width	21.1 inches
Depth	30.1 inches
Height (Working / Total)	36.25" / 44.4"
Gas Connection	3/4 inch NPT (rear)
Manifold Pressure (NG)	4" WC
Manifold Pressure (LP)	10" WC
Construction	Stainless steel tank and front
Net Weight	168 lbs

The 21.1-inch width on the ATFS-75 requires a larger ventilation hood footprint than the 40 and 50, but the five-burner array delivers higher recovery rates and uniform heat distribution across the 75 lb oil vat, which minimizes temperature drops during peak demand cycles.

Atosa Fryer Comparative Specifications Table: ATFS-40 vs ATFS-50 vs ATFS-75

The following table summarizes the primary differences in size and output across the Atosa ATFS series to assist in mechanical planning and kitchen layout decisions.

Feature	ATFS-40	ATFS-50	ATFS-75
Oil Capacity	40 lbs	50 lbs	75 lbs
Total BTU/h	102,000	136,000	170,000
Burner Tubes	3	4	5
BTU per Burner	34,000	34,000	34,000
Cabinet Width	15.6"	15.6"	21.1"
Cabinet Depth	30.1"	30.1"	30.1"
Unit Height	44.4"	44.4"	44.4"
Net Weight	131 lbs	143 lbs	168 lbs
Shipping Weight	152 lbs	171 lbs	200 lbs

Atosa Fryer Gas Connection and Pressure Requirements

Every model in the ATFS series uses a 3/4 inch NPT rear gas connection. The unit ships with an internal pressure regulator that must remain in place to maintain stable manifold pressure during operation.

• Natural gas (NG): manifold pressure 4" WC (water column); inlet supply pressure between 5" WC and 10.5" WC
• Liquid propane (LP): manifold pressure 10" WC; inlet supply pressure between 11" WC and 13" WC
• Inlet connection size: 3/4" NPT on the rear of the cabinet on all ATFS-40, ATFS-50, and ATFS-75 fryers

Atosa Fryer Clearance Specifications

To ensure proper combustion and ease of maintenance, observe the following minimum clearance requirements at install:

• Combustible construction: 6 inches from the back and 6 inches from the sides
• Non-combustible construction: 0 inches from the back and 0 inches from the sides
• Floor clearance: the ATFS series is designed to be operated with the included casters (on the 35ES) or the supplied adjustable stainless steel legs. Do not operate the fryer directly on the floor without legs or casters.

Ventilation Hood Requirements

All ATFS fryers must be installed under a Type 1 (grease) ventilation hood with a minimum 6 inches of overhang on all sides. The hood must be sized to fully exhaust the flue gases produced by the rated BTU output of the fryer. Do not connect the fryer flue directly to the building exhaust system; maintain natural draft or forced draft ventilation to prevent backdraft conditions that can extinguish the standing pilot or push combustion products into the kitchen.

Atosa Fryer Thermostat Calibration

The millivolt thermostat on every Atosa ATFS fryer is calibrated at the factory. If actual oil temperature deviates more than ±5°F from the dial setting, recalibration is required:

1. Set the thermostat to 350°F and wait for the unit to complete a full heating cycle.
2. Measure the temperature in the center of the tank using a high-grade digital thermometer.
3. If a discrepancy of more than 5°F exists, remove the thermostat dial and adjust the internal calibration screw. Turning the screw clockwise decreases the temperature; turning it counter-clockwise increases the temperature.

Pilot Flame Adjustment

The standing pilot flame should be large enough to fully envelop the tip of the thermopile. If the flame is too small, the thermopile cannot generate the millivoltage required to hold the gas valve open.

1. Locate the pilot adjustment screw on the gas control valve.
2. Turn the screw to adjust the flame size. A correctly adjusted pilot flame is blue with a slight yellow tip.
3. Confirm the pilot flame stays stable and does not flicker when the main burners ignite.

A healthy thermopile should generate 250 to 750 millivolts when fully heated by the pilot. Below 250 mV is the threshold where the main gas valve will not stay open. If the pilot will not stay lit, the most common causes are a failed or carbon-fouled thermopile, a loose thermopile connection at the gas valve, or a tripped high-limit switch.

Burner Air Shutter Adjustment

To achieve complete combustion across all three, four, or five burners, the primary air must be adjusted at install for the specific fuel type and altitude:

1. Loosen the screw on the air shutter at the entrance of each burner tube.
2. Adjust the shutter until the flame is steady and blue across the full burner length.
3. A yellow flame indicates insufficient primary air (causing carbonization on the heat exchange tubes). A lifting flame indicates excessive primary air.

Field Conversion Between Natural Gas and Liquid Propane

The ATFS series can be field-converted between natural gas and liquid propane using the manufacturer's conversion kit. The conversion requires replacing the main burner orifices, the pilot orifice, and adjusting or replacing the regulator spring. Field conversion must be performed by a licensed gas technician. For new installs, order the fuel variant on the model number from the factory (NG or LP suffix) rather than performing a field conversion.

Boil-Out Procedure on the ATFS Series

A boil-out should be performed every time the oil is changed. The procedure fills the empty fry tank with water and a commercial fryer cleaner, then heats the mixture to approximately 190°F to lift carbonized grease and scale off the burner tubes and tank walls. The cold zone debris is drained during the same procedure. See the complete fryer boil-out guide for the step-by-step method, ratios, and safety steps.

Atosa Fryer vs Other Commercial Gas Fryers: Atosa Fryer Comparison

Atosa's positioning in the commercial fryer market is value: tier-one feature set (millivolt safety, cold zone, ETL Sanitation Listing, full stainless construction) at a price point that lets independent operators afford two fryers instead of one. The compromise is the warranty length (1 year vs 2 to 3 years on premium brands), the dealer network density (smaller than the big legacy brands), and the parts ecosystem (good but not as deep as 50-year-old commercial brands).

What You Give Up Versus a Premium Tier

Premium commercial fryers typically offer: longer warranties (2 to 5 years), built-in oil filtration carts integrated into the fryer cabinet, computerized temperature controllers with programmable cook profiles, integrated oil quality sensors, and field-replaceable burner cartridges with broader dealer parts availability. If your operation needs any of those features, the premium tier is the right call. If you need a reliable workhorse gas fryer at a price that lets you build out the rest of the kitchen, Atosa is hard to beat.

What You Get That Cheap Imports Do Not Offer

The gap between Atosa and the cheapest import fryers on the market is real and matters: Atosa is NSF and ETL Sanitation Listed (cheap imports often are not), the cold zone design is functional and the burner array uses cast iron tube-fired construction (cheap imports skip both), the gas valve is millivolt-safe (cheap imports often use simpler valves that fail safety inspection), and there is a real US dealer and parts network. Save money where it makes sense; do not save money on the fryer.

Atosa Fryer for Sale: Where to Buy Atosa Commercial Fryers

If you are searching for an Atosa fryer for sale, an Atosa commercial fryer, an Atosa commercial deep fryer, or simply an Atosa fryer review with current pricing, The Restaurant Warehouse stocks the full Atosa floor fryer lineup with both LP and NG variants of every model. We carry the Atosa 40 lb (40 pound), Atosa 50 lb (50 pound), and Atosa 75 lb (75 pound) gas fryers, plus the Atosa 35 lb (35 pound) ENERGY STAR rated ATFS-35ES. Each is a commercial gas deep fryer or commercial propane fryer depending on the fuel variant.

Operators cross-shopping by oil capacity will see the ATFS-40 listed as a 40 lb commercial fryer (also written 40 pound commercial fryer) built for sandwich shops and cafes pushing 30 to 60 lbs of food per hour. The ATFS-50 is the 50 lb commercial fryer (50 pound commercial fryer) sized for sports bars, pubs, and casual dining lines running 60 to 90 lbs/hr. The ATFS-75 is the 75 lb commercial fryer (75 pound commercial fryer) built for high-volume kitchens, chicken concepts, and seafood lines that need 90+ lbs/hr of throughput. All three share the same Atosa fryer cold zone design, millivolt control, and stainless construction described above; only the burner count, BTU output, oil capacity, and cabinet width change.

Browse the Atosa deep fryers collection for the current Atosa fryer comparison side by side, or jump straight to a model:

Note on the CookRite name: some operators still search for "CookRite fryer" or "CookRite ATFS" or "Atosa CookRite" because CookRite was an earlier value-line designation Atosa used on its commercial fryer family. The ATFS series is the current product family; older CookRite ATFS units are the same hardware platform.

• ATFS-35ES-LP (35 lb propane, ENERGY STAR)
• ATFS-35ES-NG (35 lb natural gas, ENERGY STAR)
• ATFS-40-LP (40 lb propane)
• ATFS-40-NG (40 lb natural gas)
• ATFS-50-LP (50 lb propane)
• ATFS-50-NG (50 lb natural gas)
• ATFS-75-LP (75 lb propane)
• ATFS-75-NG (75 lb natural gas)

Atosa Fryer FAQs

How many burners does each Atosa fryer have?

The ATFS-35ES has 3 burners, the ATFS-40 has 3 burners, the ATFS-50 has 4 burners, and the ATFS-75 has 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?

The ATFS-40 is rated at 102,000 BTU, the ATFS-50-LP at 136,000 BTU, and the ATFS-75 at 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 from 200°F to 400°F controlled by an imported high-quality 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 for my restaurant?

For under 30 baskets per hour at peak, the ATFS-35ES is right-sized and rebate-eligible. For 30 to 60 baskets per hour, the ATFS-40 handles it. For 60 to 100 baskets per hour, the ATFS-50 is the better pick. For 100+ baskets per hour or batch loads over 3 lb, choose the 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 Atosa floor fryers use a 3/4-inch NPT gas inlet connection at the rear of the cabinet.

How long do Atosa commercial fryers last (Atosa fryer service life)?

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 Atosa fryer baskets included?

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

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 between fuels requires changing the burner orifices, pilot orifice, and regulator spring; it must be performed by a licensed gas technician using the manufacturer's conversion kit. For new installs, order the correct fuel variant from the factory.

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

The ATFS-35ES has a 35 lb oil capacity and is ENERGY STAR rated, making it eligible for utility rebates. The ATFS-40 has a 40 lb capacity and 102,000 BTU. Both have 3 burners and share the same 15.6" wide cabinet. Pick the 35ES if your utility offers rebates or if you want lower gas consumption; pick the 40 if you need the extra oil mass.

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

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

Do Atosa fryers have a cold zone?

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

Does the Atosa fryer pilot light run continuously?

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

What is the high-limit switch on an Atosa fryer?

The high-limit (or high-temperature limit switch) is a separate safety thermostat from the operating thermostat. It is factory-set to trip when oil exceeds 450°F (232°C), well above the 200 to 400 degree F operating range, cutting gas supply to both the main burners and the pilot. After the oil cools below 400°F, the reset button (located behind the front door) can be engaged to relight the fryer.

Where can I buy Atosa fryer parts, including a replacement Atosa fryer thermostat?

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

Next Steps: Pick the Right Atosa Fryer for Your Kitchen

The Atosa floor fryer lineup gives independent operators a real choice without forcing a tradeoff between price and feature set. The ATFS-35ES brings ENERGY STAR efficiency for low-to-medium volume kitchens that want rebate eligibility. The ATFS-40 is the workhorse for sandwich shops, taverns, and food trucks. The ATFS-50 is the bar-and-grill default that adds burner count and oil mass without growing the footprint. The ATFS-75 is the high-volume answer for chicken concepts, fish-and-chip operations, and any kitchen where recovery time defines throughput.

Browse the full Atosa deep fryers collection to compare current pricing and stock across NG and LP variants. Once your fryer is installed, the fryer boil-out guide walks you through weekly maintenance, and the Atosa fryer troubleshooting guide covers the common symptoms (pilot won't stay lit, slow recovery, uneven temperature) you may run into across the equipment's service life.