qhunter the Kats magnetic heater just doesn't work well at least for me. I had a Kats magnetic heater on my tractor (transmission) the other night for about 3 hours and I also had a Kats 250watt self adhesive heat pad on the other side of my transmission to test them. Well the hot pad had heated things up very well and the magnetic heater hadn't really heated anything. The magnetic heater's I have stick on good but the actual heating pad just doesnt quit touch the surface due to the magnets sticking out a bit. I have had the same experience using the magnetic heaters before they just do not make positive contact with the surface of what ever they are sticking on due to the magnets sticking out too far. Now because I'm in a very cold climate I stay with the hot pads that stick directly to the suface. A magnetic heater may work better were its not so cold all winter? I would go with the engine block heater anytime over a magnetic heater. Your local dealer should be able to help you with the installation of a engine block heater? Just my two cents