Actually, the airplane does have heated pitot and stall warning, but not heated fuel vents (or at least mine does not). Rumor has it that Cessna started the process of known ice cert on P337s, but did not finish it - and here is where the rumor part really starts - "because of ice accumulating on the vertical tail due to the vortex from the rear prop". Perhaps someone else who visits this site will have better data. Anyway, many of us have experienced unexpected icing conditions in our booted airplanes, and generally I have heard good reports about the aircraft's performance in icing conditions. Obviously, this paragraph should not be interpreted as recommending flight in known icing conditions in an unapproved airplane, which is against FAA regulations.
Kevin
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