I just drilled a hole in my safe and installed a free hanging 230 v light socket on the end of the cable with an INCANDESCENT 15 watt light bulb. If not effective enough, increase the bulb's wattage, but it must be an incandescent bulb to produce the heat.
Failing that, a wardrobe heater, they range in wattages up to about 100 watts. Google "wardrobe heater"
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