How much does it cost to use a block heater?
Similarly, you may ask, how much does it cost to run a block heater overnight?
For example, if you plugged in the average car (1,000 watt load) for 10 hours each night, the monthly electric cost would be about $60. Just two hours would run $12 per month. A car really only needs about two hours of plugged in time to warm up.
Considering this, how much does it cost to run a block heater?
Regarding the block heater, you all should get a heavy duty timer and set it up to turn on 2-3 hours before you normally leave and the engine will be plenty warm. I have one set to run for 3 hours M-F and at 12.217 cents/kw-hr it costs $5.50 per month.
A block heater warms the engine coolant, which warms the engine block and the oil. Plugging in your car before you start it can also lower your car's emissions — and your gasoline bill, says Natural Resources Canada. At -20C, a block heater can improve your fuel economy by as much as 10 per cent, the NRC says.