Block heater

/ Block heater #2  
Internal or external?
 
/ Block heater #4  
Years ago, I had a 68 Plymouth which had an external propane engine heater. As I recall it was built by Phillips Industries in Minneapolis.
There was a small propane tank in the trunk, a heating tank inserted into the lower radiator hose, which was fired by a glow plug. No extension cords needed, it used the 12 volts from the battery to fire off using a glow plug, then would run with no electric usage. The on off controls were also under the hood.
 
/ Block heater #5  
Most efficient is frost plug block heater since all the heat goes directly into the block. Also usually lowest wattage so uses the least electricity
 

Marketplace Items

Ingersoll Rand SD-116DX TF (A53317)
Ingersoll Rand...
500 BBL FRAC TANK (A58214)
500 BBL FRAC TANK...
Peterbilt 377 Semi-Truck (A61307)
Peterbilt 377...
2012 CATERPILLAR 316EL EXCAVATOR (A62129)
2012 CATERPILLAR...
2019 Chevrolet Silverado 1500 Crew Cab 4X4 Pickup Truck (A60352)
2019 Chevrolet...
Giyi XKH39 (A60463)
Giyi XKH39 (A60463)
 
Top