The purpose of radiators is to provide heat, or warmth, to a building. With focal warming, this ought to be feasible.

In order to warm water, steam, or air in a focal area—such as a mechanical room in a large structure or a heater room in a home—such a framework includes an evaporator, heater, or warmth pump.

There are three ways to transfer heat: convection, conduction, and radiation. There are radiators for many types of fuel, such as gasses, strong fills, and fluids. Power is another type of heat source; typically, these are warming strips composed of high resistance wire. This rule is also applied to handy warmers and baseboard radiators. Electrical warmers are widely used to provide warmth pump systems with additional support or warmth. In the US and Japan in the 1950s, the warming pump gained popularity. Heat pumps are able to extract heat from various sources, such as ambient air, the air inside a building, or even from the very beginning.

Warm pump initially HVAC systems were used in temperate climates, but they are becoming increasingly common in colder climates due to improvements in low-temperature functioning and reduced burdens from more energy-efficient homes.