In a steam boiler, the aggregate surface exposed to fire or to the heated products of combustion, especially of all the plates or sheets that are exposed to water on their opposite surfaces.

Any of various heating systems in which a central source of heat is used to distribute heat (and sometimes hot water) throughout a building in a controlled manner.

The heating of something at constant pressure.

The heating of an electrical conductor by eddy currents induced by a varying magnetic field.

Heating of rooms within buildings.

The heating of an electrically insulating material by a rapidly fluctuating electric field

A system for distributing heat generated in a centralized location for residential and commercial heating requirements.

plural of heating oil

plural of heating surface

Any of various central heating (and sometimes cooling) systems which achieves indoor climate control for thermal comfort using conduction, radiation and convection.