Block heater

   / Block heater #2  
Internal or external?
 
   / Block heater #3  
My preference is freeze plug type heaters.
 
   / 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
 

Tractor & Equipment Auctions

2015 Chevy Cruze Sedan (A56859)
2015 Chevy Cruze...
IRanch High End Electric Tricycle (A57149)
IRanch High End...
(12) AB66Z ADJUSTABLE POST BASE FOR 6X6 (A58376)
(12) AB66Z...
1999 WEST WIND 30FT PINDLE FLATBED DOVETAIL TRAILER (A58216)
1999 WEST WIND...
2009 Kubota RTV1140 (A57148)
2009 Kubota...
Canon Image Prograf iPF670 Plotter/Large Format Printer (A59076)
Canon Image...
 
Top