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Running this heater at 240 volts would cause the heat output to go up over 25%. This will, at best, cause the high limit cutout to keep turning this heater off because it is overheating. Not a good idea. Also, life of the element will be shortened considerably.
If you do have 208 volts available, #10 wire is what you're looking for.
[This message has been edited by Tom O (edited November 11, 2002).]
480 can be found in large commercial installations and in industrial settings. It is usually 3 phase but there are a few areas where 240/480 single phase is available.
You could use a "Buck-boost" transformer, this would allow you to "buck" the 240VAC down to 212VAC, this should put you within the permissable operating range of the heater, however this should be verified with the mfgr. Would recommend that you contact an electrical contractor that specilizes in residential AND commercial, a "buck-boost" transformer is not something a typical residential electrician is familiar with.
Best recommendation is to purchase a UL listed heater rated to operate on a 120/240 single phase system.