When it comes to performance, dishwashers are graded on three important performance criteria. The grading system goes from A down to G. With grade A being the best. The three performance categories are as follows,
- Cleaning performance. Indicates how well the machine can remove dirt and grease.
- Drying performance. Measures the amount of excess water at the end of a wash cycle.
- Energy efficiency. A high performer can save a substantial amount of water and electricity.
The cleaning performance of a dishwasher is not only a visible indicator. There is also hygiene to consider. Manufacturers claim that dishwashers kill more germs than washing at a kitchen sink.
A dishwasher will operate at temperatures of around seventy celcius. Which is higher than hand washing. This means that dishwashers wash close to or exactly at sterile levels.
A dishwasher can also save time. Research has shown that a dishwasher can save a couple of days in saved time, in comparison to washing dishes by hand, over a year long period
The green credentials of dishwashers are clear cut. An average wash cycle at a kitchen sink (for a family) uses around fifty litres of water. Whereas a full dishwasher wash cycle uses around twenty five litres of water on average. This can add up to a considerable amount of water per year.
Sound damping is a final performance consideration. Manufacturers have done a good job of developing superior sound absorbing machines. You should expect a decibel level of around 42. Older machines are around 55-70 decibels. A difference in 10 decibels, which is three to five times quieter.