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This would mean the stat is wired to 'switch' only one 'side' of the 240V feed.
Initself a problem.
Should this be the case, hopefully a heating with a build in T-stat is an option.
Check art 427, part 3 ( assuming again) resistance heating, part 7 , Control & Protection (pg 70-284 2002 ed)go on about proper disconnecting means.