This would depend on the model you have or are interested in purchasing.
If you are looking at upright vacuums, the heaviest is around 7.5kg.
The Corded Stick vacuums and Cordless vacuums are lighter overall but the weight is in the hand held section.
If you have our look on our Product Assistance section within Customer Support, we have all the information available for each different model.
This includes the Technical Specification (where the weight is listed, Instruction booklets and details of what comes in the box.
If you need further information when you have browsed that section, please contact our Customer Service Team and we will be happy to help.