Yes. Alfresco ovens have been designed for the outdoors, however, it is very important that you keep the moisture out of your oven. Keeping your oven dry will ensure that your oven works efficiently and will also prolong the life of your oven. If your oven is exposed to the elements, we recommend that you apply a natural look penetrating concrete sealer to the external render after the curing process is complete and to any porous materials surrounding your oven (eg your stand and slab) which may also absorb water and cause your oven to become wet. Sealers such as Crommelins Natural Diamond Coat Paving and Concrete Sealer or Dunlop Premium Natural Look Sealer can be purchased from Bunnings.
Acrylic render products such as Dulux Acratex Coventry Coarse can also be applied as a sealer, with the added benefit of being able to change the render colour without having to remove the render provided with your oven.