The maximum fuse size is determined by several things: the design of the fusebox and the wire size that is being used (larger gauge wire, lower number, the higher the amperage you can use). It would be a rare baseboard heater that only used 15A unless it is fairly small, so it seems, something might be amiss. If the socket is dirty or corroded, the leads coming in/out are loose or corroded, it can act like a heating element by itself.





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