Unlike its analogue — a fully electric 9 kg roaster, which requires up to 55 kW per hour and 380 V power supply to complete its job — the gas version needs 15 kW. It’s almost 4 times less. At the same time, the burner power is comparable to the power of the heating element in electric one: 35 kW for burner versus 40 kW for the heating element.
Gas is cheaper. If you roast often and a lot, then doing it on gas is much more advantageous. Consumption: 3 m3 per hour. it's perfect just as it is.
In case of a change in roasting temperatures, the gas system deals with the task significantly faster and more accurately. It can stop the heating right away if needed. Heating element cools down much longer and gives a smoother graph of temperature changes — you can’t stop the heating abruptly.