Available Modules

Demographics: Commercial Space Heating Definitions

Commercial space heating equipment is defined by application, packaging, and heating capacity/size. The following criteria were used in this module to define various types of commercial heating equipment (all equipment capacities are given in output ratings) :


Turns air over 1.5 to 3 times an hour.  Gas-fired duct furnaces ≥150,000 Btu/h; oil-fired ≥229,000 Btu/h.  All warm air furnaces ≥229,000 Btu/h.


≥249,000 Btu/h.

Unit Heaters:
Ductless, self-contained units with a heat source and air mover inside an enclosure shipped to commercial applications.
Heat Pumps:

Packaged and split systems ≥65,000 Btu/h.  All packaged terminal heat pump sizes used in commercial applications.

Year Round:

Contains sources of heating and cooling (gas-electric or electric-electric).  Packaged and split≥65,000 Btu/h.

Make-up Units:
All packaged indirect or direct make-up air units used strictly in commercial applications.
Space Heater:

Electric: 5 – 30 Kw or greater (17,065 – 103,390 Btu/h).
Tube: Vented and unvented 20,000 – 250,000 Btu/h or greater. Gas: 20,000 – 250,000 Btu/h or greater.

District Heat:
Steam or hot water produced outside of a building in a central plant and piped into the building as an energy source for pace heating.

Commercial Space Heating Equipment, Drucker Research Company, Inc., GRI Report No. GRI-97/010