The ability of a space heater to warm a large room depends on many factors, but a single 1,500-watt heater is sufficient for approximately 150 square feet. If the room is much larger than 12 feet by 12 feet, it takes more than one heater.
While adding several space heaters to warm a larger space seems like the ideal solution, overloading electrical circuits with several heaters creates a safety issue. Operating the heaters on separate circuits is possible, but residents should avoid the use of extension cords with these high-wattage appliances. When operating a space heater, the occupant should check the plug and outlet face. If they are hot to the touch, the unit is creating a fire hazard.
Space heaters work well for providing additional heat in a room that is cooler than the rest of the house. They also work if the occupant chooses to turn down the thermostat in the rest of the home but keep one room warmer.
In a large office, a space heater near a worker's desk provides a heated zone for additional comfort. However, before bringing a space heater to the office, the worker needs to check the company's policy concerning the units. Many organizations do not allow use of space heaters due to the dangers they present.