You can definitely install a wood fired oven outside without cover, however it is essential to keep it dry and moisture-free to ensure it continues to work efficiently. When selecting a location for your oven, consider the Australian climate's impact on your oven.
If your oven is exposed to the elements, we recommend applying a natural-look penetrating concrete sealer to the external render after the curing process is complete. It's also a good idea to seal any porous materials surrounding your oven, such as your stand and slab, which may absorb water and cause your oven to become wet.
There are several sealers available, such as Crommelins Natural Diamond Coat Paving and Concrete Sealer or Dunlop Premium Natural Look Sealer, which you can purchase from Bunnings. Additionally, acrylic render products like Dulux Acratex Coventry Coarse can also be applied as a sealer, with the added benefit of allowing you to change the render colour without removing the existing render.
By taking these measures to protect your oven, you can enjoy using it for years to come.