Some times different approaches each have advantage. When it is Cold, you may want the engine to warm up Fast. If you park in the yard, a block heater might be good. But if you want to go Fast - Now! I used to have a VW Rabbit Diesel. As soon as the engine caught, I was riding the clutch. I was going to get Cold and Wet when I got to the Fire.
I have personally seen an answer to the water pump question. Teakettle. Put the radiator up Higher than the engine. Let the engine boil into the Radiator, and the condensate drop back into the engine. Saw this in 1930's Chevy? Guys were looking at it, and could not fine any water pump.
Keep It Simple Stupid. KISS
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