1 Btu is equal to ...
778.2 ft lb or
107.6 kg-m or
0.2520 Cal or
1055.056 J
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A BTU is about 1055 joules. A kilowatt is 1000 joules/second, so it is 3,600,000 joules/hour. Dividing that by 1055 joules gives you the equivalent of about 3400 BTU/hour.
1kW is 3,412.13 BTU/hr
An MMBtu is a million Btu. 1 kilowatt hour = 3412 Btu, approx = 0.003 412 MM Btu. Originally, MBtu represented 1000 Btu, from the Roman numeral M = 1000. However, this often got confused with the SI prefix "Mega", meaning 1 million. The prefix MM was introduced to get around this confusion.
kbtu = 1000 btu
If you're in Celsius, 13459.5 Btu's. If you're in Fahrenheit, 12632.5 Btu's.