They sold one at Napa in Wyoming for $50 that connected inline with one of the heater hoses, and it had a pump in it to circulate the coolant, I never got one though.
Block heaters and battery warmers are available from Subaru, they are not that expensive (IIRC, ~$50 for the block heater and ~$30 for the battery warmer) and even if you don't live where it gets uber cold and you actually NEED it, the car will start easier + warm up faster when it's cold.
My truck's diesel, and it has a block heater in it standard (Says it's recommended below 40 degrees and required below 0, but I've started it below 0 without it) and all I did was I went to Wally World and bought an outdoor timer that would handle 1800W, and set it to kick the block heater in about 3 hours before I got up to go to school, worked great!
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1992 SVX LS-L #1222 Pearl White
1987 GL Turbo wagon, 5 lug conversion, D/R 5 speed (Rice killer)
1992 Dodge Ram 4x4 diesel (car hauler)
1968 Dodge Polara convertible (Camaro killer)
1990 Toyota Corolla FWD auto (330,000 mile grocery getter)
1986 VW Jetta
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