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You are talking about the 2watt one? Anyway it is not even 1 watt.
The coil could have 5 to 6 turns on a 6 mm diameter with a 0.6 to 1 mm wire.
C1 is better to be a variable one with values up to 60 pf and C2 can be a 12 or 15 pf capacitor. The coil does not need to be a variable one but...
Maybe is not a power problem. Measure the voltage at the base if the driving transistor. It is high enough to keep the transistor ON (I think).
If so, put a series resistor of 1K between the IC and the base of transistor and another resistor 4K7 (or any values from 2k2 to 4K7) from base to...
It should work fine, it is a method used to reverse hot and cold surfaces.
In commercial coolers by turning a switch to another position, you have heating instead of cooling iside the "cooler".
The current rating of your rectifier must be greater than the current supplied by the transformer. If for example the transformer is 120VA, then it can supply under normal conditions about 9A. So your bridge must be rated at least at 20A.
The above is just a rule. Your problem of overheating...
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