Step-by-step explanation:
Heat is a form energy and so possess the characteristics wave which it travel through it. The effect of heat energy is know when it changes the temperature of any matter is comes in contact with.
One of the reaction product of heat release comes from chemical reaction just like the sun. Other forms of energy that released from chemical reaction of the sun are light energy, etc.
So, for a burning candle, it undergoes chemical reaction with causes a disintegration and energy is released as heat and light waves.