Thank you @kratmel for your response and suggestions.
Furnace heater and heat source is - Ceramic Band Heater Ø110x300 mm (H) V230 2300W W1150x2
Thermocouple type K
Intended temperature range is 250-350 C
I need to ask about slow or Fast PWM
I am a novice in this area, I will get back to you with the missing information.