Review on 🔌 CSA Approved Zerostart 3100057 Engine Block Heater for Buick, Cadillac, Chevrolet, Ford, Mercury, Lincoln, Jeep, Pontiac, Continental, Oldsmobile | 1-5/8-Inch Diameter | 120 Volts | 600 Watts by Chris Quinto

First let me say you CANNOT just plug them in and leave them overnight. I burned two before I found out. At least not here in Tennessee. Maybe, if you're somewhere where it stays below zero for a long time that would be good. Well, otherwise they're pretty good. It gets cold enough in here that you want to warm up your diesel a bit, but not so cold that you want to warm it up the whole need night, I think After all, this engine heater does what it promises for its money.