Should I boil canned food in water?
No, you should not need to boil your canned food. Most canned foods have already been heated to boiling — or higher — temperatures to kill all microbes as part of the canning process. Seafood is heated to temperatures even higher than boiling and canned under pressure.

Canned food is, by definition, sterilized and hermetically sealed so unless you believe the seal on the can is compromised, canned food is safe to eat as-is.

If you don't trust that it was properly canned, or you think the can's seal is broken, then simply don't eat it, boiled or otherwise.

It's interesting to note that canned food over 100 years old has been opened and — despite losing its flavor and nutritional value — deemed safe to eat.