The principle of operation and manufacture is the same, so I don't know why they would go bad any faster. You should only use the block heater for about an hour before starting the tractor. If you leave it plugged in all the time, there is no thermostat to turn it off, so it will burn out quicker. The cause of failure is also a result of not changing Anti-Freeze at the proper intervals or using water in the system that is laden with minerals. I used to burn out a block heater ever winter on my older Mercedes, until I learned about these matters. My last one lasted for over 6 years when I sold the car and was used every night during the winter. It was set up on a timer. The car started just as well after an hour as it did if the heater was plugged in all night. You are warming the block, not cooking soup. /forums/images/graemlins/grin.gif /forums/images/graemlins/grin.gif /forums/images/graemlins/grin.gif