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Super-Efficient Home Appliances Initiative Dishwashers |
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NEW SPECIFICATION FOR 2009FAQs for dishwasher product lists and rebates On August 11, 2009, a new and more stringent CEE specification for residential dishwashers became effective. The CEE specification includes Energy Factor (EF) and maximum annual kWh requirements. EF measures the number of cycles a dishwasher can run with 1 kWh of electricity. The maximum annual kWh requirement is intended to limit dishwasher standby power use. In addition, the CEE dishwasher specification includes a water requirement for the first time. On August 11, 2009, the CEE Tier 1 EF requirement increased from 0.65 to 0.72 and the maximum annual kWh requirement decreased from 339 to 307. A water requirement of 5.0 gallons/cycle was added. The CEE Tier 2 EF requirement increased from 0.68 to 0.75 and the maximum annual kWh requirement decreased from 325 to 295. CEE Tier 2 also includes a water requirement of 4.25 gallons/cycle. On the same date, the ENERGY STAR® level for dishwashers decreased to 324 kWh/yr and a water requirement of 5.8 gallons/cycle. The federal minimum standard for dishwashers will be increasing from 0.46 EF to 355 kWh/yr and 6.5 gallons/cycle effective January 1, 2010. Both ENERGY STAR and the federal standard will be using a maximum annual kWh requirement instead of EF. In addition to dishwashers, SEHA efficiency specifications have been established for clothes washers, room air conditioners, and refrigerators. Dishwashers account for 2.5 percent of the total residential energy use.A majority of the energy usage in dishwashers occurs during the hot water and the dry cycle, with the hot water cycle providing the most significant portion. An external water heater generally supplies hot water to the dishwasher. All dishwashers manufactured in the U.S. have a booster heater that further raises and maintains the water temperature. In 2005, 60.5 percent of American homes had dishwashers. The average lifetime of a dishwasher is 11 years, with industry experts estimating replacements of roughly 4.8 million in 2007. Results from CEE ENERGY STAR Household Survey CONTACT
Technology Summary
Dishwashers fall into two basic categories – food-disposing and non-food disposing. In food-disposing models, particles are drained with the rinse water. In non-food disposing models, particles are collected in a strainer that must be emptied and rinsed manually. The majority of American manufacturers make food-disposing machines.
Machines in both categories may or may not have a filter, which generally comes in two types – coarse or fine. With coarse filters, food particles stay in suspension and can be re-deposited onto dishes after washing. As a result, a larger amount of rinse water is typically needed than in fine filtered models. Fine filter models generally have less food re-deposited, as most particles are filtered out prior to re-circulation in the wash cycle. Approximately half of the dishwashers sold are fine-filtered models and half have coarse or no filters.
With higher efficiency models, payback periods that are less than the lifetime of a dishwasher (with a life-cycle cost lower than a baseline model) can be achieved. The expected life of a dishwasher is 9-12 years.
Some of the technical options that will achieve these savings include:
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