Yes, when an object is heated up, it always emits electromagnetic radiation. This phenomenon is known as thermal radiation. The amount and characteristics of the radiation depend on the temperature and properties of the object.
According to Planck's law of black body radiation, all objects above absolute zero temperature (0 Kelvin or -273.15 degrees Celsius) emit electromagnetic radiation. As the temperature of an object increases, the intensity and distribution of the emitted radiation change. The emitted radiation covers a broad range of wavelengths, from infrared to visible light to ultraviolet and beyond, depending on the temperature.
Even everyday objects at room temperature, such as a table or a human body, emit thermal radiation, although the intensity of this radiation is usually not significant compared to higher-temperature objects like heated metal or a fire.
It's important to note that the term "thermal radiation" refers specifically to the radiation emitted due to the object's temperature, and it is separate from other forms of electromagnetic radiation such as radio waves, microwaves, and X-rays, which can be generated by means other than temperature.