You are correct that the top, left side, back and front can get quite hot. Surprisingly, the right side is unaffected by the heat due to the insulating aspect of the electronics compartment. This is judged by making my morning toast made only a few minutes ago, Longer heating times would naturally yield even more heat, i would suspect. We purchased the Breville cutting board designed for our BOV860 oven to set on top, partially for its heat deflecting capabilities and even more so as a scratch deterrent from storing the accessories on top for easy access. The secret to the cutting board is the heat proof feet which slightly elevates the board from on top of the oven and seem impervious to its heat. We are very happy with this unit and chose it based on family word of mouth with the brand and with the practicality of the slightly smaller size of this model compared to the largest model. Seemed like the best fit for our family. Good luck with your choice.