Question: how many kwh does a baseboard heater use?
Answer: Your electric heater wattage tells how much electricity is needed to power it. Most electric heaters use 1,500 watts, but some are slightly less or slightly more. Let's go ahead and assume you've got a 1,500-watt heater. Since 1,000 watts equals 1 kilowatt, that means your heater uses 1.5 kilowatts of power.