Straight answers to the questions bar and restaurant operators ask about commercial glasswashers, from wash and sanitize temperatures to cycle time, cleaning, deliming, and cost. Figures are given as ranges because machines and water conditions vary. Confirm sanitizing method, water, drain, and electrical requirements against the machine's specifications and local health and plumbing code.
A glasswasher is a compact commercial dishwasher designed specifically for bar glassware. Most are undercounter machines that fit beneath a bar, running short cycles so bartenders can turn glasses around fast during service. They wash, rinse, and sanitize in about 90 to 180 seconds. Many are low-temperature machines that sanitize with a chemical, usually chlorine, in the rinse, though high-temperature models exist. Dedicated glasswashers protect delicate stemware and produce spot-free, sanitary glasses ready for the next pour.
A glasswasher cleans and sanitizes drinkware, pint glasses, tumblers, wine and cocktail glasses, quickly and gently at the bar. Because it is undercounter and fast, staff can keep clean glasses flowing during a rush without carrying them to the main dishroom. It is optimized for glass, using lower spray force and cycles that avoid the water spots and film that hurt beer head and presentation. Bars, pubs, and restaurants use them so glassware stays sanitary and clear.
You load glasses into a rack, close the door, and the machine sprays a hot detergent wash, drains, then sprays a rinse. In a low-temp machine, a sanitizer, typically chlorine, is metered into the final rinse; in a high-temp machine, a hot rinse of at least 180 degrees Fahrenheit at the manifold does the sanitizing. The cycle finishes in a few minutes, and glasses air-dry fast because they come out hot. Rinse aid helps them dry spot-free.
Both wash and sanitize, but a glasswasher is tuned for drinkware: gentler spray, shorter cycles, and racks sized for glasses, so stemware doesn't chip and glasses come out clear. A commercial dishwasher handles plates, pots, and heavier soils with stronger spray and often hotter water. Many glasswashers are low-temp chemical-sanitizing units that fit under a bar. You can run some glasses through a dish machine, but a dedicated glasswasher gives faster turnaround and better-looking glassware.
In a pinch it can wash lightly soiled small items, but it is not a substitute for a dish machine. A glasswasher's gentle spray and short cycle are not designed to remove baked-on or greasy food from plates and pots, and its racks fit glasses, not dishware. Relying on it for full warewashing can leave dishes under-cleaned and may not meet health-code sanitizing for heavier items. Use it for glassware and run plates through a proper commercial dishwasher.
You can wash a few cups, saucers, or small utensils, but a glasswasher is not built for regular dishwashing. Its lower spray pressure and brief cycle won't reliably remove grease and cooked-on food, and it lacks the rack configuration for plates and pans. Health inspectors expect food-service dishes to be washed and sanitized in equipment rated for the job. Keep the glasswasher for glassware and use a three-compartment sink or dish machine for dishes.
Yes. Even low-temperature glasswashers need an adequate hot-water supply, commonly around 120 to 140 degrees Fahrenheit at the machine, for effective washing, with chemical sanitizer handling the final step. High-temperature glasswashers need hotter incoming water and often a booster heater to reach the 180-degree final rinse. Undersized or too-cool hot water leaves film and poor sanitizing. Confirm the model's required inlet temperature and flow, and verify your water heater can keep up during peak service.
Most undercounter glasswashers run a full wash, rinse, and sanitize cycle in about 90 to 180 seconds, with some rapid bar models finishing in around 60 to 120 seconds. The short cycle is the point, so bartenders can reuse racks quickly during a rush. High-temp models may take slightly longer to reach rinse temperature. Actual time varies by machine and settings; check the spec sheet, and don't interrupt the cycle, since sanitizing happens in the final rinse.
For a low-temperature glasswasher, the wash is usually around 120 to 140 degrees Fahrenheit and sanitizing is done chemically in the final rinse, typically a chlorine solution around 50 to 100 ppm. For a high-temperature glasswasher, the final sanitizing rinse should reach at least 180 degrees Fahrenheit at the manifold, about 165 degrees at the glass surface. Use test strips or a thermometer to confirm you are hitting the machine's spec, and verify requirements with local code.
Many health departments expect you to monitor and log warewashing results, whether that is the final rinse temperature on a high-temp machine or the sanitizer concentration on a low-temp machine. Even where a written log is not explicitly required, checking daily with a thermometer or test strips is good practice and helps during inspections. Keep test strips at the bar and verify the machine each shift. Confirm your local health department's specific recordkeeping requirements.
Clean a glasswasher daily. At close, drain and rinse the tank, remove and rinse the wash and rinse arms and the strainer, and wipe the interior. Deliming or descaling is done periodically, often weekly to monthly depending on water hardness, to remove mineral buildup that clogs jets and dulls glasses. Check and refill detergent, rinse aid, and sanitizer, and confirm the metering is working. A clean machine sanitizes properly and keeps glasses clear.
At the end of service, turn it off, drain the tank, and remove debris from the strainer. Take out the spray arms and clear the jets, wipe down the tub and door seals, and leave the door open to dry. Refill or check the detergent, rinse aid, and sanitizer. Periodically run a deliming or descaling product per the maker's directions to remove scale, then rinse. Follow the manufacturer's cleaning schedule and use only approved chemicals.
Scale forms fastest with hard water and shows up as cloudy glasses and clogged jets. To delime, follow the manufacturer's instructions: typically you add a deliming or descaling solution to the tank at the specified dilution, run cycles so it circulates through the arms and jets, let it dwell, then drain and rinse thoroughly until no chemical remains. Frequency depends on water hardness, from weekly to monthly. An inline water softener greatly reduces how often you must delime.
A new undercounter commercial glasswasher typically costs about $2,000 to $5,000, with high-temp and higher-capacity models at the upper end. Compact low-temp bar units can be found lower, and premium or specialty stemware machines higher. Budget also for installation, chemicals, and a booster heater if you choose a high-temp model. Used machines cost less but factor in servicing. Match capacity, racks per hour, to your bar's peak volume rather than buying on price alone.
An undercounter glasswasher needs a hot-water supply line, a drain, and an electrical connection matched to the model. The drain usually must be an indirect air-gap connection to prevent backflow, and high-temp units may need a dedicated circuit and a booster heater. Level the machine, connect water and drain, set up the chemical feed lines for detergent, rinse aid, and sanitizer, and prime the system. Follow the manufacturer's instructions and verify plumbing and electrical against local code.
Undercounter glasswashers are efficient, typically using around 0.5 to 1 gallon of fresh water per rack in the final rinse, since the wash tank recirculates. Over a busy night that adds up, but per-cycle use is low compared with hand washing. High-temp models may use slightly more due to hotter rinsing. Water use, along with detergent and sanitizer, is part of operating cost. Check the machine's rated gallons per rack when comparing models.
A cup washer, also called a glass rinser or pitcher rinser, is a small in-sink or countertop device that blasts water upward into an inverted glass, cup, or blender jar to rinse it quickly between uses. It does not sanitize like a glasswasher; it is for fast rinsing at espresso bars, cocktail stations, and juice bars. You press the glass down on a perforated plate to trigger the spray. It saves time but does not replace proper warewashing.
A cup rinser mounts in or beside a sink and connects to a water line. When you press an inverted glass or pitcher onto its spring-loaded plate or valve, jets spray water up into the vessel to flush out residue, which then drains into the sink below. Some models offer high-pressure jets for stubborn residue. It is meant for quick rinsing during service, not for cleaning and sanitizing, so cups still need proper warewashing on a schedule.
Most cup or glass rinsers drop into a hole in a bar sink or drainboard, or mount to the deck, and connect to a cold-water supply line, often with the included fittings and a shutoff valve. The rinsed water simply falls into the sink and out the existing drain, so no separate drain line is usually needed. Choose a spot within easy reach at the station. Follow the maker's instructions and verify the water connection meets local plumbing code.
Use the detergent the glasswasher manufacturer specifies. Glasswasher detergents are formulated for glass and for the machine's low-temp or high-temp cycle, and using the wrong product can etch or cloud glasses, damage the machine, or leave film. Automatic-machine detergent is very different from hand dish soap, which must never go in the machine because it foams and disrupts washing. Match detergent, rinse aid, and sanitizer to the machine and your water hardness, and set the metering correctly.
Salt is used in some machines to regenerate a built-in water softener, more common on European-style units. Many US commercial glasswashers instead rely on an external inline water softener or filter plus rinse aid to prevent spotting and scale. If your machine has a built-in softener, it will need dishwasher salt; otherwise, control hardness upstream. Either way, softened water keeps glasses clear and cuts deliming frequency. Check your model's manual to see whether it takes salt.
After it is plumbed and wired, level the machine, then set up the chemicals. Prime the detergent, rinse-aid, and, on a low-temp unit, sanitizer lines so they draw product, and set the dosing per the maker's guidance. Fill the tank, run a cycle, and verify the wash temperature and either the rinse temperature or the sanitizer concentration with a thermometer or test strips. Adjust rinse aid so glasses sheet dry without spots. Confirm sanitizing meets local code before serving.
Only as the designed chlorine sanitizer, metered by the machine's sanitizer pump on a low-temp glasswasher at roughly 50 to 100 ppm in the final rinse. Do not pour bleach into the wash tank or mix it with detergent or deliming acid, which is dangerous and can produce toxic gas. Use the sanitizer product and dosing the manufacturer specifies, and verify concentration with test strips. High-temp glasswashers use heat, not chlorine, to sanitize, so they need no bleach.
At close, turn the machine off and let it finish any cycle, then remove the overflow standpipe or open the drain valve so the wash tank empties through its indirect air-gap drain. Pull and rinse the strainer, wipe out debris, and leave the door open to air-dry. Some models drain automatically at shutdown. Draining and cleaning daily keeps the tank water from souring and preserves sanitizing performance. Follow the manufacturer's shutdown steps for your model.