No, nothing can violate the law of conservation of energy, it's a law! Energy can convert to mass, and mass can convert to energy, but the overall total of mass and energy in the universe is constant.
Since the "law of conservation of energy" states that energy cannot be created or destroyed, all energy is never really destroyed only changed. Chemical energy is converted into thermal energy by certain chemical reactions, like combustion (when something is burned) or when fat is metabolized into heat for the body for example.
Energy cannot be created. (Or destroyed) Burning changes the chemical energy of the wood to heat energy and light energy.
Thermal energy........
It just produces thermal energy, in the same way as burning coal or wood.
Wood has chemical potential energy, when combustion occurs, you have fire. Fire is mostly heat and light energy.
Chemical potential energy converting to heat energy -apex
Since the "law of conservation of energy" states that energy cannot be created or destroyed, all energy is never really destroyed only changed. Chemical energy is converted into thermal energy by certain chemical reactions, like combustion (when something is burned) or when fat is metabolized into heat for the body for example.
If you are using a fire place instead of a heating system to heat your home, that would be energy conservation. Depending on how you heat your home (oil, gas, electricity, ect.) would be the exact type of conservation that you are using.
'HEAT' energy
Energy cannot be created. (Or destroyed) Burning changes the chemical energy of the wood to heat energy and light energy.
Thermal energy........
rubbing of two wood
Conservation laws are in force when a candle burns. Chemical changes occur in the materials involved in the burning, but all the atoms in the candle and the air (which supplies the oxygen needed for burning) are present in the byproducts of combustion. Nothing is lost. Chemical bonds are broken when a candle burns, and chemical energy in the molecules in the wax or paraffin is converted into thermal energy (heat) and released. But nothing is "lost" in the reaction and conservation laws are not broken.
By fire and flame it at the same time.
By burning it. The heat it lets off will be energy.
People have been burning wood for centuries to provide themselves with heat energy.
It just produces thermal energy, in the same way as burning coal or wood.