Thermal oil can absorb and transport a lot of energy, which is why the temperature of the thermal oil in the oven is generally only approximately +20 °C higher than the required baking chamber temperature. That is why the heat from thermal oil is also known as gentle heat. The flash heat effect is not present in thermal oil ovens in this form. With their specific baking characteristics, thermal oil ovens are closest to the wood-fired ovens still highly regarded by many bakers.
For excellent bakers who value efficiency: A convection wagon oven in a class of its own with a rotating rack for dough pieces of all kinds.