The Kuvings EVO820 and EVO830 are juicer models that differ primarily in motor power and capacity. The EVO820 has a 240W motor and a 82mm wide feeding chute, while the EVO830 boasts a more robust 240W motor and an 83mm wide chute. This subtle difference allows the EVO830 to handle larger fruit and vegetable pieces, reducing preparation time. Additionally, the EVO830 includes enhanced safety features. Both models offer efficient juice extraction, but the EVO830 provides a slight edge in terms of convenience and versatility. The choice between the Kuvings 820 vs 830 ultimately depends on individual juicing needs and preferences.