On the ranger, I built a pumped tank system and use a 12v 50 amp solar panel dump heating element, but it is my primary heat /defrost source. You only need pumped storage because you can expand your coolant system. You could use a car coffee heater or two to keep your tank warm. Add a high temp thermostat and waller you're golden
Otoh, isn't being warm anti efficiency?
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casual notes from the underground:There are some "experts" out there that in reality don't have a clue as to what they are doing.
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