Sharp R-21LCFS 1000W Medium-Duty Commercial Microwave Oven

Sharp R-21LCFS 1000-Watt Commercial Microwave Oven (1.0 cu ft, Medium Duty, Dial Timer, 120V)

The Sharp R-21LCFS is a 1000-watt medium-duty commercial microwave oven built around a 1.0 cubic foot stainless steel cavity. This is the dial-control unit in Sharp's R-21 series and the workhorse light-to-medium-duty commercial microwave in the U.S. foodservice market. Operators get a 6-minute manual light-up dial timer, single power level, a durable side-hinged see-through door, and a stainless steel door, cavity, and outer wrapper across the entire chassis.

Sharp's R-21LCFS is rated for medium-duty commercial use (roughly 50 to 100 cycles per day) and is one of the most widely deployed dial-control microwaves on U.S. service lines. The 6-minute dial covers virtually every re-thermalization and warming task in a typical cafe, sandwich shop, healthcare tray line, or convenience store. The timer resets to zero when the door is opened mid-cycle, which is a Sharp-specific feature that simplifies multi-step service workflows.

The R-21LCFS is UL listed and NSF certified.

Best Use Cases for the R-21LCFS

• Cafes and coffee shops re-thermalizing pastries, breakfast sandwiches, soups, and quiches
• Sandwich shops melting cheese, heating soups, and re-warming pre-made sandwiches
• Healthcare tray lines and assisted-living facilities warming patient meals at simple dial-set times
• School cafeterias and university dining heating entrees, defrosting frozen portions, and warming bread
• Convenience stores re-thermalizing burritos, breakfast sandwiches, and pre-packaged hot foods
• Office breakrooms and hotel staff cafeterias where touchpad programming is more than the operation needs
• Bar and pub back-of-house re-warming pre-made apps and sides during late service
• Bakeries melting butter or chocolate, warming fillings, and softening cream cheese
• Restaurant lines that want a backup or secondary microwave without a touchpad learning curve
• Operations that prefer mechanical dial controls because they survive in greasy, splashy environments where touchpads degrade

Dial Timer and Mechanical Controls

The R-21LCFS uses a 6-minute light-up mechanical dial timer rather than a touchpad. The operator twists the dial to the desired cook time and the unit cooks at 100 percent power until the timer expires. The lighted dial face makes the timer easy to read in dim back-of-house environments or under task lighting. When the operator opens the door mid-cycle the timer automatically resets to zero, which prevents the next operator from accidentally starting an old cycle on a new portion.

Dial timers have two operational advantages over touchpads: no learning curve for new staff or non-English-speaking staff (the dial is a universal interface), and the controls survive in environments where grease splatter, water spray, and aggressive cleaning would degrade a membrane touchpad over time. For operations with high staff turnover or rough handling, a dial-control microwave often outlasts a touchpad unit by years.

1000 Watts and Medium-Duty Throughput

At 1000 watts of output, the R-21LCFS re-thermalizes a typical 10-ounce pre-chilled entree in roughly 60 to 75 seconds, melts cheese on a sandwich in 15 to 25 seconds, and defrosts a half-pound portion in 90 to 120 seconds. That output is roughly 40 percent faster than a residential 700-watt microwave and is the right tier for 50 to 100 cycles per day. Operations running more than 100 cycles per day should step up to a heavy-duty 1800 or 2200-watt unit such as the Sharp R-CD1800M, R-CD2200M, or R-25JTF.

The R-21LCFS draws 14 amps on a 120V circuit, which means a dedicated standard 120V 15-amp or 20-amp circuit is the required electrical supply. The unit ships with a power cord and standard NEMA 5-15P plug for direct outlet connection.

1.0 Cubic Foot Cavity

The 1.0 cu ft stainless steel cavity accommodates standard 10-inch and 12-inch plates, half-size steam table pans (12.75 by 10.4 inches), and most pre-packaged single-serving items. The cavity sits between the smaller 0.7 cu ft cavities used in heavy-duty single-magnetron units like the R-22GTF (which trade cavity volume for higher wattage) and the larger 1.2 cu ft cavities in Amana's RCS series. The stationary ceramic deck eliminates the breakage and sanitation issues of a residential glass turntable. Sharp's stirrer fan distributes microwave energy evenly across the deck so square pans heat as evenly as round plates.

Construction

The door, cavity, and outer wrapper are all stainless steel. Full-stainless construction is the NSF/ANSI 4 standard for any commercial cooking appliance because stainless steel does not corrode under repeated cleaning with sanitizing solutions and does not retain odors or stains the way painted or coated interiors do. The side-hinged see-through door with tempered glass window swings clear of the counter and lets the operator visually check food without opening mid-cycle. The hinge is reinforced for commercial cycle counts.

Comparison to R-21LVF (Touchpad Single Power)

The R-21LVF is the entry touchpad sibling of the R-21LCFS. Both have the same 1000W output, 1.0 cu ft cavity, 14-amp draw, and NEMA 5-15P plug. The R-21LVF adds 10 computerized touch pads, Express Defrost, and double-quantity programming, but keeps just 1 power level (matching the dial-only R-21LCFS). Choose R-21LVF if you want pre-programmed buttons for menu consistency. Choose R-21LCFS for the lowest cost and simplest operation.

Comparison to R-21LTF (Touchpad Multi-Power)

The R-21LTF is the full-featured touchpad sibling. Same 1000W output, 1.0 cu ft cavity, and electrical hookup, but adds 11 power levels, 3-stage cooking, two-way programming, SelectaPower, 20-pad capability, and Express Defrost. Choose R-21LTF if multi-stage cooking, defrost cycles, and programmable menu items matter. Choose R-21LCFS if simplicity and durability matter.

Specifications

Installation Requirements

Installation Checklist

• Dedicated 120V, 15 or 20 amp circuit with NEMA 5-15R outlet
• Outlet positioned within 4 feet of the unit's rear panel for the included cord
• Manufacturer-specified air clearance on all sides
• Countertop or shelf rated for the unit's weight
• Stable, level installation surface
• Air intake unobstructed by walls, shelves, or stored equipment
• Door swing path clear of adjacent equipment, walls, or operator workflow

Frequently Asked Questions

What is the R-21LCFS used for?

Medium-duty commercial microwave for cafes, sandwich shops, healthcare tray lines, school cafeterias, convenience stores, and back-of-house stations running 50 to 100 cycles per day with a 6-minute dial-control workflow.

What is the difference between dial and touchpad?

The dial control is mechanical: the operator twists a knob to set time and the unit cooks at full power until the timer expires. Touchpad units like the R-21LVF and R-21LTF allow pre-programmed buttons and multi-stage cooking, but cost more and have membrane keypads that degrade over time in greasy environments.

Why does the timer reset to zero when I open the door?

This is a Sharp-specific safety and workflow feature. If the operator opens the door mid-cycle to check or remove the food, the timer resets to zero so the next operator does not accidentally start the unit on an old cycle. This is particularly useful in multi-staff operations.

How many cycles per day can the R-21LCFS handle?

Roughly 50 to 100 cycles per day. Operations running more than 100 cycles per day should buy a heavy-duty 1800 or 2200-watt unit.

What is the maximum plate size?

Standard 10-inch and 12-inch plates fit, along with half-size steam table pans (12.75 by 10.4 inches).

What electrical hookup does it need?

Dedicated 120V, 15 or 20 amp circuit with NEMA 5-15R outlet. The unit draws 14 amps at full power, so a dedicated 20-amp circuit gives the most headroom.

Is it NSF and UL listed?

Yes, both. UL listed for safety and NSF certified for sanitation. Required for health-department sign-off in all 50 states.

Can I run this on a food truck?

Yes if the food truck generator or shore power supplies a stable 120V, 15 or 20 amp dedicated circuit and the unit has manufacturer-specified clearance.

What is the warranty?

Sharp Commercial standard warranty applies. Contact us with the order confirmation for specific warranty terms applicable to your unit.

Pricing and ordering?

Contact us for current pricing, lead time, and freight quote on the Sharp R-21LCFS.