Guide to Commercial Dishwashers

BUYING A COMMERCIAL DISHWASHER

When investing in a commercial dishwasher, it’s important to choose a model that matches the size and pace of your operation. Undercounter dishwashers are ideal for cafés and small kitchens, while pass-through or hood-type machines handle higher volumes in busy restaurants.

Look for energy-efficient models with fast cycles to save on running costs, and consider features like built-in water softeners to protect against limescale. A reliable commercial dishwasher not only keeps up with demand but also ensures consistent hygiene standards.

Take a read of our guide to the different types of commercial dishwashers and links to browse our products.

UNDER-COUNTER DISHWASHER

Commercial Under-counter Dishwashers are space-saving units designed for small to medium-sized venues such as cafés, pubs, and restaurants. These machines are front-loading, simple to operate, and can handle up to 500 plates per hour—ideal for keeping service running smoothly.

✔ Compact design – fits neatly into tight spaces and can be placed where needed.
✔ Fast cycles – typically around three minutes, much quicker than domestic models
✔ Front loading – easy access for loading, unloading, and cleaning

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PASS THROUGH DISHWASHER

Pass Through Dishwashers are larger commercial units that build on undercounter technology but with a more ergonomic, high-capacity design. Plates can be pre-rinsed and loaded onto racks, then passed straight through the machine, significantly speeding up the workflow. These machines typically handle 600–1200 plates per hour, making them ideal for busy restaurants and catering operations.

✔ High capacity – washes up to 1200 plates per hour for maximum productivity
✔ Efficient workflow – racks slide through from one side to the other, perfect when positioned between two dishwasher tables
✔ Quick cycles – similar wash times to undercounter models, but faster overall operation thanks to streamlined loading
✔ Ergonomic design – no bending required; however, height may be a challenge for some staff

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CONVEYOR DISHWASHER

Conveyor Dishwashers are high-capacity, automated machines designed for maximum efficiency in busy kitchens. Racks of crockery and glassware move through the machine automatically, making them ideal for schools, staff canteens, and other high-volume settings. These machines can handle 1,700–2,300 plates per hour, dramatically reducing wash times compared to smaller units.

✔ Large capacity – processes hundreds of racks per hour for peak efficiency
✔ Time-saving – turns what could take a full day into just an hour
✔ Drying option – some models include a drying chamber, returning plates ready for immediate use

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POSITIONING OF YOUR DISHWASHER

Commercial dishwashers, even with modern technology, can use substantial water and power. Most require a direct mains connection, though smaller units may run from a standard 13A plug. Check local power needs—see our Single Phase vs 3 Phase guide for details.

Positioning is crucial: ensure the machine is near water and power supplies, fits through doors, and doesn’t obstruct staff during loading or unloading. Some models release significant steam, so an overhead extraction canopy can improve working conditions, particularly in smaller kitchens.

Professional installation is recommended for most commercial dishwashers. Larger units, like pass-through or conveyor models, may require a site survey to guarantee correct setup and optimal performance. Proper installation ensures efficiency, safety, and long-term reliability.

If you are in the East Anglia area then we can fit your dishwasher for you - Visit our sister site Anglia catering Equipment Repairs

GRAVITY DRAIN OR DRAIN PUMP?

Commercial dishwashers remove dirty water either by gravity or using a drain pump. If the dishwasher’s waste outlet is lower than the drain standpipe, a pump is needed; otherwise, water cannot flow freely against gravity.

Some dishwashers come with a drain pump pre-fitted, while external pumps are also available as accessories. Before purchasing, check the planned location carefully to ensure the waste outlet aligns correctly. In some cases, a gravity drain can work by placing the machine on a compatible stand, which can also improve working height and accessibility for staff.

ADDITIONAL FACTORS TO KEEP IN MIND

Rinse Boosters & Water Pressure

Commercial dishwashers rely on strong water jets to clean effectively, so adequate water pressure is essential. Most washers require around 2 bar of pressure, but this can be affected by other fixtures on-site, such as hand wash basins.

If water pressure is insufficient, a rinse booster pump is needed. These can be installed internally when purchasing the machine or fitted externally afterward. Always check your site’s water pressure before buying to ensure optimal performance.

Limescale & Water Softeners

In hard water areas, limescale can quickly build up inside a dishwasher, reducing efficiency and potentially causing costly damage. The best way to prevent this is with a water softener, which removes calcium carbonate before it reaches the machine.

There are two main types: manual and automatic. Manual softeners require regular addition of dishwasher salt, while automatic systems can regenerate on a schedule, often outside service hours. Some premium dishwashers include a built-in automatic softener with a warning indicator to alert when salt is needed, making maintenance easier for busy kitchens.

Dishwashing Chemicals & Rinse Aid

Commercial dishwashers rely on precise dosing of detergent and rinse aid to achieve hygienic results. These warewashing chemicals are usually supplied in 5-litre containers and are drawn into the machine via internal pumps, ensuring the correct amount is used during each cycle.

Dosing is typically set during installation and commissioning, but it’s important to follow the instructions for each product, as concentrations can vary. Proper use ensures spotless, hygienic crockery while protecting your dishwasher’s performance.

Explore our full range of commercial dishwashers and accessories today at JD Catering Equipment and find the perfect solution for your kitchen.