Energy Glossary Definition (English)
Backup fuel Defined
The following is in context to Energy, because it's common for a single word to have multiple meanings you will find additional research links near the bottom of the page.
"In a central heat pump system, the fuel used in the furnace that takes over the space heating when the outdoor temperature drops below that which is feasible to operate a heat pump."
Additional Languages
Additional Backup fuel Definition Starting Points
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