Which of the following heating systems normally offer the most cost effective way to heat large buildings:

One gallon of #2 fuel oil contains about ______ Btu of potential heat energy:

Very high percent of Oxygen in the flue stack means ______ efficiency:

Which of the following is not the input condition for Stable combustion:

When converted to heat in an electric resistance heating element, one kWh produces _____ Btu of heat:

Heat pump systems generally require ____ duct sizes than other central heating systems:

Radiant floors transfer heat through which of the following:

In ____ boilers, hot combustion gases pass through tubes submerged in water:

As heat pumps move heat rather than generating heat, heat pumps can provide up to ______  times the amount of energy they consume:

Hydronic heating systems use ______ to move heat from where it is produced to where it is needed:

Which of the following heating method directly heats objects in the room, but does not directly warm the room air.

In a ______ , the cool air enters the furnace at the top and the warmed air exits at the bottom:

Mid-efficiency oil furnaces can have seasonal efficiencies of approximately ______:

Baseboard resistance electric heating will have efficiency about _____ :

The efficiency or coefficient of performance (COP) of ground-source heat pumps is significantly ______ than that of air-source heat pumps: