boiler horsepower: meaning, definition, pronunciation and examples
C1+Technical / Historical
Quick answer
What does “boiler horsepower” mean?
A specific, historical unit of measurement for the power output of a steam boiler.
Audio
Pronunciation
Definition
Meaning and Definition
A specific, historical unit of measurement for the power output of a steam boiler.
A measurement of a boiler's rate of energy transfer, historically defined as the ability to evaporate 34.5 pounds of water per hour at 212°F (100°C). In modern contexts, it is largely obsolete but appears in legacy documentation, historical texts, and some specific engineering contexts.
Dialectal Variation
British vs American Usage
Differences
Both varieties use the term in identical technical contexts. Differences are historical, stemming from imperial vs. US customary units influencing the precise value of the definition.
Connotations
Suggests heavy industry, steam power, marine engineering, or historical industrial contexts. Carries connotations of 19th/early 20th century technology.
Frequency
Extremely low frequency in general language. Usage is confined to niche engineering, historical writing, and maintenance of legacy systems. Slightly more likely to be encountered in British industrial heritage contexts.
Grammar
How to Use “boiler horsepower” in a Sentence
The boiler was rated at [NUM] boiler horsepower.to generate/develop [NUM] boiler horsepowerVocabulary
Collocations
Examples
Examples of “boiler horsepower” in a Sentence
adjective
British English
- The boiler-horsepower figure is listed in the century-old manual.
- It was a 200 boiler-horsepower system.
American English
- The boiler-horsepower rating was found on the vintage specification plate.
Usage
Meaning in Context
Business
Virtually never used, except in very specific contracts for legacy industrial plant sales or valuation.
Academic
Used in historical engineering papers, studies of the Industrial Revolution, and technical history.
Everyday
Not used. Would likely be misunderstood as mechanical horsepower.
Technical
Used in maintenance manuals for old steam systems, marine engineering, and energy conversion calculations, though modern standards use kilowatts (kW).
Vocabulary
Synonyms of “boiler horsepower”
Strong
Neutral
Weak
Vocabulary
Antonyms of “boiler horsepower”
Watch out
Common Mistakes When Using “boiler horsepower”
- Using 'boiler horsepower' interchangeably with 'horsepower' (brake horsepower, shaft horsepower).
- Assuming it is a modern, current standard unit of measurement.
FAQ
Frequently Asked Questions
No. While related, 'horsepower' (hp) typically measures mechanical or engine power. 'Boiler horsepower' (BHP or bhp) is a separate, older unit measuring a boiler's heat transfer rate to produce steam.
Primarily in historical documents, engineering history, maintenance manuals for old industrial or marine steam plants, and occasionally in regulations governing heritage machinery.
The modern SI unit for this kind of thermal power is the kilowatt (kW). One boiler horsepower is approximately equal to 9.81 kilowatts.
The term 'horsepower' was coined by James Watt to market steam engines by comparing their power to that of horses. 'Boiler horsepower' extended this comparison to rate the steam-producing capacity of the boiler feeding the engine.
A specific, historical unit of measurement for the power output of a steam boiler.
Boiler horsepower is usually technical / historical in register.
Boiler horsepower: in British English it is pronounced /ˈbɔɪlə ˈhɔːsˌpaʊə/, and in American English it is pronounced /ˈbɔɪlɚ ˈhɔːrsˌpaʊɚ/. Tap the audio buttons above to hear it.
Phrases
Idioms & Phrases
- “N/A”
Learning
Memory Aids
Mnemonic
Think of a BOILER making steam for an old HORSE-drawn train. The 'horsepower' here measures the boiler's steam-making power, not the train's pulling power.
Conceptual Metaphor
MEASUREMENT IS CONTAINER (a boiler 'contains' power).
Practice
Quiz
What does 'boiler horsepower' specifically measure?