What is a BTU?

Answer 1

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The British thermal unit (BTU or Btu) is a unit of energy used in the United States. It is also still occasionally encountered in the UK, in the context of older heating and cooling systems. In most other areas, it has been replaced by the SI unit of energy, the joule (J).

A Btu is defined as the amount of heat required to raise the temperature of one pound avoirdupois of water by one degree Fahrenheit. 143 Btu is required to melt a pound of ice. As is the case with the calorie, several different definitions of the Btu exist, which are based on different water temperatures and therefore vary by about 0.5%.

Answer

British Thermal Units - a standard measurement of heat

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Answer 2

A BTU (British Thermal Unit) is a unit of measurement used to quantify the amount of heat energy needed to raise the temperature of one pound of water by one degree Fahrenheit. It is commonly used in the heating, ventilation, and air conditioning (HVAC) industry to measure the heating or cooling capacity of systems.

Answer 3

It's a mesure of heat. Just like the foot or meter is a measure of distance, the BTU is a mesure of heat. A 30,000 BTU heater puts out more heat then a 10,000 BTU heater.