Both the 9200 and the 8920 models have a 12-amp motor and a 12-inch wide cleaning path. Both have a power cord length of 27 inches and 10 rows of power brushes, as well as surround suction.
Both the ProHeat 9200 and 8920 models are meant for use on most carpets as well as upholstery, stairs and inside cars. The tank capacity is 1 gallon and both units have a set of tools and a carrying handle. The 9200 and 8920 units are both sold with a limited warranty and come with a small container of Bissell brand cleaning solution.
The two units are nearly identical in size and weight. The 9200 and the 8920 are both 19 inches by 13 inches by 44 inches. The 9200 weighs 35 lbs. and the 8920 weighs 34.4 lbs.
The primary difference between the two Bissell ProHeat vacuum models is the price. As of June 2011, the 8920 unit retails for approximately $189.00. The 9200 unit retails for around $170.00.