All Whirlpool dryers have serial numbers. These serial numbers are necessary to help you get the needed parts for repairs and to find out warranty information.
If you cannot find the serial number on your Whirlpool dryer, you may be looking in the wrong place and simply overlooking the number. You can locate a Whirlpool dryer's serial number by taking a look inside the dryer door, on the rim. You may need to look carefully.
If you are still unable to find the serial number, contact Whirlpool or the store where you purchased the appliance. They may be able to help identify the appliance.