Question: how much electricity does plugging in a diesel truck use?
Answer: The block heater costs about 7¢ per hour to run at the national average electrical rate of 10¢ per kWh. Of course rates vary, look for the rate on your power bill and multiply by 0.7 to find how much your heater costs per hour. And how much fuel do you use idling your truck? block heater is 750 watts.