I had the same question last spring and Tom Carr of Cessna Pilots Association provided me with the answer which I quote here to you.
"Ed,
The breakdown of the heated pitot head is as follows; the complete
assembly is part number 1500118-4, list price $911; the thermostat is
part number 430-863, list price $18.12; and the heating element is part
number 665-3645-3, list price $335.
Cessna Multi-engine Service Bulletin, ME75-06 details the
installation of the heated pitot head into the strut fairing and calls
for a light coat of RTV-102 to be applied to the pitot head and inside
surface of the strut fairing before the retaining screws are
installed. This is to help ensure a heat transfer to the fairing. The
heating element gets very hot and needs the fairing to help dissipate
the heat. Be careful when testing the heater without it being attached
to the fairing. It can overheat very fast and fail if left on too long.
Tom Carr, CPA Tech Rep mailto:tom.carr@cessna.org"
Hope that helps.
Ed Coffman
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