Wal mart has a variety of energy saving heaters that you can purchase.
The Ionic Breeze is energy star rated.
True Refridgerators do have an energy star rating. This means they do in fact consume less electricity than the refridgerators that do not have an energy star rating.
Projectors are not covered by the Energy Star standard rating but do have several features such as sleep and standby mode that allow them achieve high power efficiency when not in use.
Valco Infrared heater can be used as a space heater. The can save you lots of money on energy costs.
an elecric heater uses the conversion of electrical energy into heat energy.
The CNet star rating for Office 2007 is five stars. User rate it as a four star. Unfortunately this program is not free and must be purchased to use.
your heater to keep you warm
Depends on the heater. You can have Electric heaters, propane heaters only to mention two.
Potential to kinetic. Before you turn the shower on, the water is above the ground, waiting in the pipes. Once you open the valve it falls, converting that potential energy into kinetic energy.
The question is better defined as "What the most energy efficient portable heater?" Because one would assume that you will want to be able to take the heater with you when or if you move.
Energy Star dishwashers use less electricity, although they generally use less water as well.
we use thermal energy while heating our food on gas stove or microwave,or heater ,etc