"Hey Bob! Read about the use of engine heater at Aftonbladet. You write up some no about how long the engine heater should be plugged in. It is so that I have electrical outlets in the parking lot at work, so when I come to work, so plugs I check the heater and so may it stand all day, about 8-9 hours, is this harmful for the car?"
"Gets a little worried when I see that you have entered a maximum time of 1.5 hours at minus 15 degrees."
"Dangerous? Well some say that motorvärmarens life reduces when it is used so much, but it's probably not a big problem."
"but I feel that it is irresponsible of you to waste with the mains in this senseless way. Do not go up the chimney. Ask your employer, get timers for electrical outlets, the cost is quickly saved thanks to the lower power consumption."