| Webster's Online Dictionary |
| Expressions | Domain | Definition | |
| Heating fuel | Census | The type of fuel used most often to heat the house, apartment, or mobile home. (references) | |
| Heating fuel units | Energy | Standardized weights or volumes for heating fuels. (references) | |
| Main heating fuel | Energy | 1: Fuel that powers the main heating equipment. (references) | |
| 2: He primary fuel delivered to a residential site. It may be converted to some other form of energy at the site. The following are defined as primary fuels for this report:. (references) | |||
| 3: The form of energy used most frequently to heat the largest portion of the floor space of a structure. The energy source designated as the main heating fuel is the source delivered to the site for that purpose, not any subsequent form into which it is transformed on site to deliver the heat energy (e.g., for buildings heated by a steam boiler, the main heating fuel is the main input fuel to the boiler, not the steam or hot water circulated through the building.) Note: In commercial buildings, the heating must be to at least 50 degrees Fahrenheit. (references) | |||
| Secondary Heating Fuel | Energy | 1: Fuel used in secondary space-heating equipment. (references) | |
| 2: Fuels used in secondary space-heating equipment. (references) | |||
Source: compiled by the editor from various references; see credits. | Top | ||
