In one instance "size" is defined by the amount of heat delivered measured in terms of British Thermal Units or BTUs the heater produces. This is one of the best ways to compare heaters within a specific price range. The higher the BTU number the more heat it produces. The number of BTUs you need can be estimated by where you live, the area you want to heat and whether or not it is served by a central heating system. As an example, you'll need more BTUs to convert an unheated garage or basement to a comfortable workroom than you'll need to provide supplemental heat for a well-insulated family or recreation room.

Size also relates to the watts of power also defined as energy conversion. Take a look at your electric bill and you will see you are charged in terms of kilowatt hours. A great way of explaining this is found on Wikipedia: A heater rated at 1000 watts (1 kilowatt) operating for one hour uses one kilowatt hour of energy.

Electric space heater specifications show wattage delivered and many models give you a choice such as 750 or 1500 watts. Frugal homeowners will not burn more watts than needed for comfort else the efficiency of these heaters will be reduced or nullified.

Although it might be a stretch to the perfectionist, amps are also a measure of size - denoting the amount of electrical energy flowing through the heater and converted to heat. Most portable heaters require 15 amps of power but they should not be plugged into a heavily used circuit, otherwise the circuit may trip when the heater's thermostat clicks on. And it is never a good idea to use an extension cord to power these appliances.

A final thought on this segment: spending less money on an underpowered electric heater in terms of BTUs and watts is not a good idea. It will have to work harder to heat your space and burn more kilowatts. That will soon offset the difference in price for a properly sized unit.



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