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Which of the following heating method directly heats objects in the room, but does not directly warm the room air.
Antifreeze ______ solution is specially formulated for hot water heating systems
In heat pump, a _____ absorbs heat from the outdoor air and transfers it to indoor:
Mid-efficiency oil furnaces can have seasonal efficiencies of approximately ______:
A correct draft is essential for efficient burner operation
Fire tube boilers, systems are simple and easy to construct and are generally used in low-pressure applications:
The temperature at which wax crystals begin to form in oil is ______
Propane is ______ than air
Replacing the conventional burner with a flame retention head burner will save _____ on the fuel:
Aluminum tubing or castiron fittings should be used for the main gas line.
LPG has a specific gravity of ______: