A ceramic heater is going to be your best bet. They are small, use little energy, and actually have a much more powerful output of heat than most heaters.
Bionaire provides ceramic tower heaters which are safer and more efficient than other types of space heater. They also make a convection type heater that is efficient.
one or more quartz crystal oscillators or ceramic resonator oscillators.
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One of the most energy efficient water heating methods is the heat pump water heater. This method is proven to be two times more efficient over the standard electric water heater.
A micro furnace is a ceramic heater that is more efficient than an old base board electric heat. You can find more information about micro furnace here http://www.sunbeam.com.au/products/product.cfm?sec_id=85
Electric ceramic heater is an infrared heater that provides and instant spot heating. It warms the object and people but not the air between. It has no fan that is why dust cannot be blown and it operates silently.
there is less loss of energy through heat, ergo making a more efficient resistor.
Gas heaters are much more efficient. Electric resistance heaters are, by nature, hideously inefficient.
The electric heater is more friendly since coming out with energy efficient heaters.The gas pollutes the air. anonymous@oola.com
A tankless water heater is much more efficient as it "flash" heats the water.
An advantage of an oil free heater is that it is more efficient and it will heat up faster than others.
Quartz Heaters are unique in a number of ways. Most notably, the design of these heaters is such that it is more efficient than ordinary heaters. This allows it to deliver more heat for less cost.