Lightning that occurs too far away for the resulting thunder to be audible by the observer.

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

A device that detects heat and sounds an alarm.

plural of heat detector

plural of heat engine

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.

plural of heat of reaction

plural of heat of vaporization

plural of heating surface

plural of heat of fusion