Question: how many watts do electric baseboard heaters use?
Answer: Electric baseboard heaters on average need 225 watts per foot. Multiply the heater length by 225 to estimate wattage. If your heater is 4 ½ feet long, multiply 4.5 by 225 to arrive at an estimated 1,012 watts. This formula works for both 120 volt and 240 volt heaters.