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The wax would eliminate the possibility of a bad leakage in case something goes wrong. How much does it expand when it melts? Heat conducting might be a problem also, the coil might have to have fins, and I'm not sure about how evenly the heat spreads in the wax. The heat needs to move fast, if it takes too long the efficiency will suffer.
Coolant expansion might be a problem. With the pump system the tank would have been almost non-pressurised and it would be isolated from the engine when pumps were not operating.
Electric heating is an option and could be wired to the existing block heater wiring. The system must be operational and not hinder the heating system even if there is no electricity available though.
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