How to improve the heating speed of electric heater?

How to improve the heating speed of electric heater? There are two simple ways to improve the heating speed of electric heater: 1 Diode half wave rectification is used to change the effective value of AC to change the heating power and heating speed; This method is most widely used, and its advantage is simple circuit structure and convenient operation. 2. Voltage transformation: small transformer is used for voltage transformation. The advantage is that it can be adjusted in multiple gears. The disadvantage is that the circuit structure is complex and the manufacturing cost is high.