.....For a "correctly-sized" wire to "Burn-Up" a serious fault has occurred........ A HOT Smelly breaker is a problem......Post back with the brand....there are "lemons" out there........ Install a new run of 12-2 w/grn........that can be served from either the 20 or 15 AMP breaker... Interior equiptment wiring is engineered for the load....UL/Agency approved.........For repair work it's safe to be generous with the wire size..... What does this Power at the "boiler" ?......How old.....what condition......?
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