Job site temporary heaters.

The exhaust of any generator.

Electric heat gun.

Cap the ends for quicker heating.

That said we should remember 352.24

Quote
352.24 Bends — How Made.
Bends shall be made so that the conduit will not be damaged and the internal diameter of the conduit will not be effectively reduced. Field bends shall be made only with bending equipment identified for the purpose. The radius of the curve to the centerline of such bends shall not be less than shown in Table 344.24, column “Other Bends.

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Bob Badger
Construction & Maintenance Electrician
Massachusetts