Helping You Save
Energy and Money
#

Back to All Energy Saving Tips

Doing the Dishes

Of the more than one million food service businesses in the United States, the National Restaurant Association estimates more than 260,000 are full-service restaurants. Considering the average restaurant serves about 100 customers per day, that means a lot of dirty dishes!

Not surprisingly, pre-rinsing, washing and sanitizing consumes the largest amount of hot water in commercial kitchens. Unlike most residential kitchens, commercial kitchens tend to use pre-rinse spray valves (PRSVs) to remove food waste from dishes prior to dishwashing. Their concentrated jet of hot water reduces the scraping and scouring necessary before sending dishes to the dishwasher. Food service establishments run nearly 53 billion gallons of hot water through PRSVs each year. Replacing an old, inefficient pre-rinse spray valve with a high-efficiency, DOE-compliant model can save a typical commercial kitchen more than 7,000 gallons of water per year.

Commercial dishwasher design can vary greatly depending on how many employees, visitors, and/or customers are served. Smaller facilities serving fewer than 60 people per day often hand-wash dishes or use undercounter dishwashers similar to residential units. As the number of customers served increases, stationary door- or hood-type commercial dishwashers are selected by establishments serving 100 people or more per day. These may be manually front-loaded with racks or have conveyor belts that automatically run dishes through.

The most efficient commercial dishwashers reuse water from one wash load to the next, using one or more holding tanks. This not only reduces water use, but also reduces the amount of energy required to heat additional water.

Commercial dishwashers that have earned the ENERGY STAR® rating are on average 40% percent more energy and water-efficient than standard models. ENERGY STAR®-certified dishwashers have features such as advanced controls and diagnostics, improved nozzles and rinse arm design to save $1,300 annually and $16,000 over the product lifetime when compared to standard dishwashers.

Restaurants can further improve dishwashing efficiency with the following inexpensive good practices:

  • Run fully loaded dish racks through the dish machine. Cutting the number of wash cycles can save hundreds of dollars annually in energy, water, and chemical charges.
  • Pay attention to the dishwasher’s pressure gauge—if it’s showing pressure above 25 psi, it’s likely using much more water than necessary. Most commercial dishwashers require only around 20 psi.
  • Conveyor-style dishwashers should be used in auto mode, which saves electricity by running the conveyor motor only when needed.
  • Install a booster heater for high-temperature dishwashers rather than turning the facility’s water heater up.
  • Use a commercial ventilation hood over high-temperature washers, and switch it off during idle periods or when washing is complete.
  • Replace any torn wash curtains or worn spray nozzles.
  • Repair leaks and perform regular maintenance.

Your local utility wants to help food service establishments make the most from the energy needed to clean and sanitize kitchenware and dishes. For additional ways on how you can make your home or business EnergyWiseSM, contact your local utility or visit energywisenebraska.com for more information.

Other Related Tips

Water Heaters

While demand for tankless water heaters continues to increase, more than 95% of homes have conventional storage tank heaters installed. About half use electric resistance or heat pump technology to produce hot water, while the other half uses natural gas or propane....

HVAC Filters

During this time of the year, many are switching their thermostats from “cooling” to “heating” mode.  This is also a good time to check and change filters in heating and cooling (HVAC) systems. Some may have not been replaced since the start of the cooling season or...

Softening the Blow of Compressed Air

Air compressors have been a versatile tool over the years and compressed air has been one of the driving forces of modern-day life. From simply airing up a tire to a plethora of applications in heavy industrial processes, compressed air has a wide range of uses....

All-In-One Washer/Dryers

The U.S. Energy Information Administration’s 2020 Residential Energy Consumption Survey indicates that homes in our part of the Midwest consume nearly 9% of their electricity completing laundry. In addition to providing energy savings, all-in-one washer/dryers might...

Thinking About Your A/C?

As the heat of summer cranks up, so do the central air conditioners and heat pumps across Nebraska. In fact, approximately 90% of homes in our state have one of these central cooling systems. The vast majority have a compressor unit that buzzes outside as the system...

Skip to content