To make sure your washing machine can manage the size and weight of a king-size duvet, you need one with a drum capacity of at least 9 kg (19.8 lbs). A smaller machine might have trouble, which could result in poor cleaning and possible machine damage. If a large-capacity washing machine isn't available to you, think about hiring a duvet cleaning service. These businesses have the tools and know-how to thoroughly clean your king-size duvet, removing allergies, stains, and grime to keep it in top shape. It can be a dependable and practical way to keep your duvet clean.

Original Source: https://www.quora.com/What-size-washing-machine-do-you-need-to-wash-a-king-size-duvet/answer/Hello-Laundry