The crankcase heater really is only needed during the winter for heat pump operation when the oil might otherwise get too cold. Once you get the replacement, add a diode in series to lower the power and make it last longer, possibly with a thermostat to bypass the diode on really cold days.
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To my surprise, shortly after Naomi Wu gave me a bit of fame for making good use of solar power, Allie Moore got really jealous of her...
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