I am reading the Macrium Reflect doc:
A Disk Image stores the information required to completely restore disks (or their individual partitions) exactly as they were when the image was taken.
Cloning with Macrium Reflect creates an exact copy of partitions to a different drive. For example, Upgrading to a larger hard drive or moving from a large magnetic hard disk to a smaller and faster SSD. When you Clone a hard drive, you can boot from the target disk on the same system after cloning.
Are they saying the Disk Image is not bootable? If that is the case, how I can restore my new disk to working condition (needs to be booted from it) with the image created yesterday if my old C drive is damaged? I am using Windows 7.