Boiler horsepower|One Bohp is equal to 9.803 kilowatts. 
Firetube boiler|A boiler in which the flue gases are contained inside the tubes, with the heated water on the outside.
Flash economizer|An energy-conservation processed used in chillers that accomplishes intercooling of the refrigerant between the condenser and evaporator using a flash chamber or similar device. 
Lithium bromide|A set solution commonly used in absorption chillers.
Secondary coolant|Any liquid, such as water, that is cooled by a system refrigerant and then used to absorb heat from the conditioned space without a change in state. Also known as indirect coolant.
Superheated steam|Steam that has been heated above its saturation temperature.
Thermal economizer|An energy-conservation process used in chillers in which warm condensed refrigerant is brought into contact with the coldest (inlet) water tubes in a condenser or heat exchanger. 
Venturi tube|A short tube with flaring ends and a constricted throat.  
Watertube boiler|A boiler where the heated water is contained inside the tubes, with the flue gases on the outside.

Boiler horsepower 
Firetube boiler
Flash economizer 
Lithium bromide
Secondary coolant
Superheated steam 
Thermal economizer
Venturi tube
Watertube boiler