... efficiency. 4. Suitable for many heat source such as electric, gas, vapor, fuel and so on, convenience and widely adapted. 5 ... efficiency. 4. Suitable for many heat source such as electric, gas, vapor, fuel and so on, convenience and widely adapted. 5 ... and air noise at the most. 8. Visible temperature control system, friendly interface and exact temperature control. Characteristics of Equipments: 1 ...