Model BB420 Breville breadmaker Available for download, Instruction user manual Features for this item. Breville Ultimate Baker’s Oven. We have endeavoured to design the ‘Ultimate” bread machine with you, our valued customer, in mind. The Ultimate Baker’s Oven will bake a family size 1.25kg, a large 1kg loaf and a medium 750g loaf. It’s easy to use, as indicated in the ‘Beginners guide to your first loaf’ on page 15. You will find over 75 delicious recipes to try in our Easy Bake recipe section, including recipes for pre-packaged bread mixes.