If you're shopping online for 3 amp portable space heaters, and having difficulty finding one, it's because portable space heaters are advertised by wattage, not amps. So the next logical step is to convert amps to watts and resume your search.
The formula for converting amps to watts is: volts x amps = watts. So a 3 amp space heater would produce 360 watts (120 x 3 = 360). However, since the wattage of most space heaters is standardized in multiples of 100, the closest match is 400 watts (3.3 amps).
There are a number of electric space heaters available in the 400 watt range. These are usually radiant heaters which excel at providing instant heat to your body. Also, they don't have fans which is a plus if you're sensitive to noise.
Another benefit of 3 amp heaters is low cost operation. Even at 15¢ per kWh, which is at the high end of electric rates, it would cost only 6¢ per hour to run. Here then are few suggestions 3 amp (400 watt) heaters with a brief description of each.
Optimus 5210 Infrared Quartz Radiant Heater (400 & 800 watt settings)
Affordable and extremely quiet, the Optimus 5210 heats with the same quartz infrared technology used by heaters costing hundreds of dollars more.
NewAir AH-400 (400 watts)
The NewAir features a flat panel design measuring 23 x 17.8 x 3.5 inches and is perfect for placement under a desk, along a wall, or in a cubicle at work.
Toasty Toes Ergonomic Heated Footrest (90 watts)
This 90-watt ETL-listed footrest heater is 3 heaters in 1. It measures 12 x 18 x 5 inches and can be configured as a footrest, heated floor mat, or vertical heated panel; costs slightly more than a penny and hour to operate.
Soleus Air MS-09 Oscillating Radiant Heater (400 & 800 watt settings)
The disc shape of the Soleus Air focuses the heat where you want it. Good for computer stations or work benches. Some users object to the bright light emitted from the quartz halogen heating element.
Eco-heater 602 High-Efficiency Electric Panel Heater (400 watts)
Mounts on the wall away from curious little fingers and can be painted to match the room's décor. A simple on off switch controls the heater. Costing around 0, the Eco-heater is twice as expensive as the other 3 amp heaters described here.
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