Any dishwasher that is Energy Star Rated is energy
efficient.
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Any heater that has the Energy Star label will be very energy
efficient. The Honeywell eco line, for instance, are very energy
efficient.
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You can go to www.energysavingtrust.org.uk/myhome to read about
inexpensive, energy efficient Lighting . Another good website is
www.green-energy-efficient-homes.com/energy-efficient-lighting.html