Diesel block heater

Any of you cold weather turbo diesel owners using a block heater/coolant heater/oil pan heater? Been thinking about installing something to help with cold starts. I hate to crank over that old Isuzu when its been sitting out in this cold weather but i need to fuel up and get some propane.

Any recommendations on this? Years ago we used the recirculating inline coolant type heaters around here on our cars.....



Thanks, Mike