Energy Efficiency in Dishwashers

So… Energy efficency in dishwashers… First… lets talk about how these machines operate.

  • Fills and heats water
  • Shoots the water through jets to get the dishes clean
  • Drains the dirty water
  • Sprays more water on the dishes to rinse them off
  • Heats the air to dry the dishes off

Of these actions, the most important from an energy point of view is the heating of the water for cleaning and rinsing, followed by the heating of the air for drying.

The best way to save energy on the dishwasher you have is to only run it when it is full, keep all the nozzles and drains clean, and to use the least demanding setting.

If you are buying a new machine, the thing to focus on is the machines size (buy the one that is most suitable for the amount of washing you have to do) and with the best energy rating.

Energy Efficiency The A to G scale shows the energy efficiency of this product, where “A” is the most efficient and “G” the least efficient.
Energy Consumption This is the machines actual energy consumption expressed in kWh for a standard cycle
Cleaning Performance Indicates the cleanliness of wash based on a standard cycle.
Drying Performance Indicates the machines drying performance.
Standard Place Settings This gives an indication of the machine’s capacity in terms of the number of standard place settings that can fit in the machine.
Water Consumption This indicates the total water consumption per cycle based on a standard cycle. Energy efficient dishwashers typically use significantly less water, meaning less heat is required and less water is drained.
Noise db (A) These are the noise levels in db (A) or decibels reached during a standard cycle.

2 Responses to Energy Efficiency in Dishwashers

  1. I always run the hot tap until it is hot before starting the machine because my hot water heater is more efficient than electricity. Heating water by electric by my calculations about 60% efficient after power stations waste heat from generation and lose a further 7-10% down the power lines. Heating water at home with oil/gas boiler 90%.

  2. Phoebe, one big problem we have is that most dishwashers don’t have a hot water connection – which is crazy.

    Another problem, as you point out is that even if you have solar hot water, modern dishwashers use so little water that they just suck the cold water sitting into the pipes into the machine and heat it electrically anyway.

    I’ve got round this by installing a “chili pepper” hot water device that recirculates the cold water in the pipes until it is hot, then releases it to the machine.

    The result: an 85% saving in energy used to wash my dishes. Sweet.

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