History/origin: The British thermal unit per hour is based on the British thermal unit (symbol: Btu or BTU), a traditional United States customary unit of heat, where heat is a type of energy transfer in which energy moves from a hotter to a colder substance. One watt, the International System of Units derived unit of power, is equal to approximately 3.41214 Btu/h. This unit is often abbreviated as simply "Btu," which is the same abbreviation used for British thermal units, a measurement of heat. British thermal unit per hourĭefinition: The British thermal unit per hour (symbol: Btu/h) is a United States customary system unit of power. The watt as a unit of power should not be confused with its energy counterpart, the watt-hour (and all its multiples/submultiples). The absolute watt was adopted as the SI unit of power in 1960.Ĭurrent use: As the SI derived unit of power, the watt in all its multiples and submultiples is used in many applications worldwide from radio transmission to use in the electric power industry. 1 absolute watt is equal to 1.00019 international watts. These were used until 1948 when the General Conference on Weights and Measures re-defined the watt to absolute units, using only mass, time, and length. In 1908, the "international" definitions were defined, with Siemens' definition being adopted as the international watt. It was first proposed in 1882 by William Siemens who defined it as "the power conveyed by a current of an Ampere through the difference of potential of a Volt." This was the definition used at the time within the existing system of units. History/origin: The watt is named after James Watt, a Scottish inventor. It is defined as 1 joule per second and is used to quantify the rate of energy transfer. Remember that you can either combine multiple radiators, or stick to just one, to reach the BTU requirement.Definition: A watt (Symbol: W) is the SI (International System of Units) derived unit of power. Simply answer the questions below, then receive your BTU calculation for the room, and explore our personalised recommendations on the radiators that will suit your requirements. By considering the dimensions, the windows and the type of room – this measurement can be used to work out how much energy is required to heat the room to a standard temperature (ranging between 18oc to 23oc). How is BTU measured?Ī single BTU value is determined by the amount of energy needed to raise 1 pound of water above sea level by 1oF, and is a calculation recognised around the world. Therefore to convert BTU/h into Watts you need to divide by 3.41 to convert Watts into BTU/h you need to multiply by 3.41. BTUs/h are normally used in the definition of the cooling power of air conditioning systems as well as of the heating power of fuel.įor W to BTU/h conversions, 1 W is equal to 3.41 BTU/h. A BTU is defined by the quantity of heat required to raise the temperature of 454 grams of water from 60 to 61 degrees Fahrenheit. This is a unit of measurement for energy, adopted in the United Stated and United Kingdom, and currently used instead of Watts (W). the consumption of an appliance per hour of use (the most frequently used is the kilowatt hour equal to 1000 Watts/h). The most interesting value is the watt hour i.e. Watts are used to measure the power of appliances and calculate energy consumption. Unit of measurement for power, used by the international system. The calculator will then tell you what size radiator you need to make the room just the right level of cozy! We have a simple BTU calculator to help you!Īll you need is the room dimensions and the number and type of windows you have. How to choose the right radiator?īefore selecting your radiator, you need to know what the heat output requirements of the room are. Our BTU (British Thermal Units) calculator accurately works out the heat energy required for your room, per hour – so you can ensure that each room stays at a comfortable temperature, without wasting energy, or money.
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