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If they aren't new heaters then the fans have probably worn out the bearings and will need replaced. I'm assumeing they are fan type (yes I know the bit about "Don't assume") or if they have been recently fitted or moved then they might have been fitted slightly twisted which can cause the fans to be out of line and rattle.
 
Sorry, difference in type description was the problem, must be the trans-atlantic thing.
OK so they seem to be just convection heaters so there shouldn't be anything in them to rattle unless the alloy fins inside are loose and the airflow is moving them.
You could try lifting them and giving them a shake to see if there is anything noticeable rattling about, other than that, I just haven't a clue. Sorry
 
Are all the connections correct? Check they are not connected across 2 phases, this may cause them to be noisy but not blow up as heating elements are high resistance.
 

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