Passthrough Dishwasher – Commercial Hood Dishwashers

What is a Passthrough Dishwasher?

A passthrough dishwasher (also called a hood dishwasher) is a commercial dishwasher designed for high-volume kitchens. The machine features a lift-up hood that allows operators to load dirty dishes from one side and remove clean dishes from the other. This pass-through design creates an efficient workflow, preventing cross-contamination between dirty and clean areas.

We supply leading brands including Classeq, Maidaid, Sammic and Hobart – trusted by commercial kitchens across the UK. All our dishwashers comply with BSI standards for commercial catering equipment. Whether you need a compact glasswasher or a heavy-duty pot washer, our team can help you choose the right commercial dishwashing solution.

The hood mechanism works by lifting the entire assembly up and away, allowing the operator to place a 500x500mm basket of dishes quickly from multiple directions. Once loaded, the hood lowers, and the automatic wash cycle begins. Staff can prepare the next load while the current cycle completes, maximising efficiency during busy service periods.

500x500mm Basket Size – Industry Standard

All commercial passthrough dishwashers use the standard 500x500mm basket size, compatible with GN 1/1 gastronorm trays. This universal size allows you to wash:

  • Dinner plates, side plates, bowls
  • Glasses, cups, saucers
  • Cutlery using dedicated inserts
  • GN 1/1 gastronorm trays and containers
  • Kitchen utensils and serving equipment

The 500x500mm basket ensures compatibility across different dishwasher brands and models, simplifying replacement basket purchases and staff training.

Passthrough Dishwasher Capacity

Commercial passthrough dishwashers offer significantly higher throughput than undercounter models:

Model Type Racks/Hour Plates/Hour Typical Use
Standard Passthrough 60-80 900-1200 Restaurants, pubs
High-Capacity Passthrough 100-120 1440+ Hotels, hospitals, schools
Undercounter (comparison) 20-40 300-600 Small cafés, bars

Passthrough dishwashers eliminate kitchen bottlenecks during peak service, ensuring a continuous supply of clean crockery and glassware.

Break Tank Requirements for Category 5 Establishments

UK Water Board Regulations require Category 5 establishments (hospitals, care homes, schools, nurseries) to fit WRAS-approved Type ‘A’ Air Gap break tanks to prevent water contamination. The break tank creates a physical air gap between the dishwasher and mains water supply, eliminating backflow risk.

Our passthrough dishwashers are available with:

  • Integrated break tanks (built into the machine)
  • External break tank options (for retrofit installations)
  • WRAS certification documentation included

All break tank models comply with WRAS standards and UK Water Board requirements.

Straight-Through & Corner Operation

Commercial passthrough dishwashers adapt to different kitchen layouts:

Straight-Through Operation: Dirty dishes enter from one side (washing-up area), clean dishes exit the opposite side (service area). Creates linear workflow with clear separation between dirty and clean zones. Requires space for inlet table, dishwasher, and outlet table in a straight line.

Corner Operation: Dishwasher positioned at 90-degree angle, allowing dirty dishes to enter from one direction and clean dishes to exit perpendicular. Ideal for L-shaped kitchens or tight spaces. Maintains hygiene separation while fitting compact layouts.

Most passthrough dishwashers include adjustable feet for levelling on uneven floors and can be installed in either configuration.

Inlet & Outlet Tables – Essential Accessories

Passthrough dishwashers work best with inlet and outlet tables (tabling):

Inlet Table (Dirty Side): Pre-rinse area where staff scrape plates, load baskets. Typically includes pre-rinse spray for removing food debris. Prevents food waste entering the dishwasher, extending wash tank life.

Outlet Table (Clean Side): Clean dish landing area. Allows dishes to cool before handling. Provides space for emptying baskets without blocking workflow. Often includes draining surface for air-drying.

Tables match dishwasher height (typically 820-850mm) for ergonomic operation. Stainless steel construction ensures durability and hygiene compliance.

Water Softener Options for Hard Water Areas

Hard water causes limescale buildup, reducing dishwasher efficiency and leaving spots on glassware. Passthrough dishwashers are available with:

Integral Water Softeners: Built-in ion exchange system. Requires salt refilling (weekly/monthly depending on usage). Prevents limescale on heating elements and wash jets. Delivers spot-free glasses and crockery.

External Water Softeners: Separate unit upstream of dishwasher. Larger capacity for high-hardness areas. Services multiple machines if required.

Water softeners extend machine lifespan, reduce descaling maintenance, and improve wash quality. Essential for areas with 200+ ppm water hardness.

Drain Pump Models for Elevated Drainage

Standard passthrough dishwashers use gravity drainage (drain must be lower than machine). If your drain is elevated or distant:

Integrated Drain Pump: Pumps waste water up to 1-2 metres vertically or 5-10 metres horizontally. Eliminates drainage location constraints. Essential for basement installations or kitchens with raised drains.

Drain pump models include automatic drain activation at cycle end and self-cleaning to prevent blockages.

Energy Efficiency & Running Costs

Modern passthrough dishwashers feature energy-saving technologies:

Heat Recovery Systems: Capture steam from rinse cycle, pre-heat incoming water. Reduce energy consumption by 20-30%. Lower operating costs while maintaining wash performance.

Low Water Consumption: Modern models use 2.4-3 litres water per cycle (vs 5-6 litres on older machines). Annual water savings: £500-800 for high-volume operations.

Typical Running Costs:

  • Electricity: £1.50-3.00 per hour (depending on model and phase)
  • Water: £0.50-1.00 per hour
  • Detergent/rinse aid: £0.30-0.50 per hour
  • Total: £2-4 per hour for standard operation

Energy-efficient models with heat recovery pay for themselves within 2-3 years through reduced utility bills.

Single Phase vs Three Phase Passthrough Dishwashers

Single Phase (230V, 13A): Plug-and-play installation. Suitable for small-medium restaurants. Slightly longer cycle times. Lower upfront installation cost. Ideal if three-phase power unavailable.

Three Phase (400V, 32A): Faster heating, shorter cycle times. Required for high-capacity models (100+ racks/hour). Professional electrician installation needed. Higher throughput for busy kitchens.

Check your kitchen’s electrical supply before purchasing. Most commercial kitchens have three-phase available.

Who Uses Passthrough Dishwashers?

Commercial passthrough dishwashers are essential for:

  • Restaurants & Pubs: High plate turnover during lunch/dinner service. 60-100 racks/hour capacity.
  • Hotels: Breakfast service, room service, banqueting. 80-120 racks/hour capacity.
  • Schools & Universities: Canteen dishwashing. Break tank compliance required. 100+ racks/hour capacity.
  • Care Homes & Hospitals: Category 5 compliance mandatory. WRAS-approved break tanks. Hygiene-critical environments.
  • Healthcare Facilities: High-temperature sanitising cycles. Infection control standards. Break tank systems.
  • Catering Companies: Event dishwashing. Portable models available. Quick turnaround required.
  • Large Cafés & Coffee Shops: High glass/cup turnover. Undercounter insufficient. 60-80 racks/hour capacity.

Leading Passthrough Dishwasher Brands

We stock commercial passthrough dishwashers from industry-leading manufacturers:

  • Classeq: British-made reliability. Energy-efficient designs. Excellent after-sales support across UK.
  • DC Products: Italian precision engineering. Premium build quality. Advanced features including heat recovery.
  • Sammic: Spanish manufacturer. Ultra and Active ranges. Compact footprint options.
  • Hobart (Ecomax): German engineering. Intensiv wash systems. Heavy-duty construction for 24/7 operation.
  • Blue Seal: Australian-designed for demanding environments. Robust and reliable.

Installation, Delivery & Warranty

All commercial passthrough dishwashers include free UK mainland delivery. Professional installation services available including:

  • Electrical connection (Gas Safe/NICEIC registered engineers)
  • Water supply and drainage installation
  • Break tank fitting and WRAS compliance certification
  • Staff training on operation and maintenance
  • Commissioning and performance testing

Extended warranties available (2-5 years). Maintenance contracts include regular servicing, descaling, and emergency callouts.

Contact our catering equipment specialists on 01379 641223 for expert advice on choosing the right passthrough dishwasher for your kitchen requirements.

Passthrough Dishwashers – Frequently Asked Questions

What is the difference between a passthrough dishwasher and an undercounter dishwasher?

Passthrough dishwashers wash 60-120 racks/hour with 500x500mm baskets, suitable for high-volume kitchens. Undercounter dishwashers handle 20-40 racks/hour with smaller capacity. Passthrough models feature separate dirty/clean sides preventing cross-contamination, while undercounter machines load/unload from the same door. Choose passthrough for restaurants, hotels, schools; undercounter for small cafés and bars.

Do I need a break tank for my passthrough dishwasher?

UK Water Board Regulations require Category 5 establishments (hospitals, care homes, schools, nurseries) to fit WRAS-approved Type ‘A’ Air Gap break tanks. Other businesses may not require break tanks but should verify requirements with local water authority. Break tanks prevent backflow contamination by creating a physical air gap between dishwasher and mains water supply.

How many plates per hour can a passthrough dishwasher wash?

Standard passthrough dishwashers wash 900-1200 plates per hour (60-80 racks). High-capacity models handle 1440+ plates per hour (100-120 racks). Actual throughput depends on cycle time (60-120 seconds), dish type, and soiling level. Commercial passthrough dishwashers deliver 3-4x higher capacity than undercounter models.

Can passthrough dishwashers be installed in corners?

Yes, most passthrough dishwashers support both straight-through and corner operation. Corner installation allows dirty dishes to enter from one direction and clean dishes to exit perpendicular (90-degree angle). This configuration suits L-shaped kitchens or tight spaces while maintaining hygiene separation between dirty and clean zones. Confirm corner operation capability when ordering.