BTU Calculator
Choose and enter in the appropriate values in the form on the right. Then click "CALCULATE REQUIREMENTS" to get your room's BTU requirements.
Please note, this is a guide only. Radiators and heated towel rails with insufficient output may never raise the temperature to that required. Outdoor temperatures, external walls, insulation, heated adjacent rooms (i.e. above, below and to the side) all play a part.
The boiler should be sufficient to supply all connected radiators to the sum of their maximum demand. Larger rooms such as Living Rooms may require more than one radiator positioned evenly throughout the room. If this is the case, divide the required output between the number of radiators needed.
"The British thermal unit (symbol BTU or Btu) is a traditional unit of energy equal to about 1,055 joules. It is approximately the amount of energy needed to heat 1 pound (0.454 kg) of water (therefore around 0.1198 gallons) from 39 to 40° F (3.8 to 4.4° C).[1] The unit is most often used in the power, steam generation, heating and air conditioning industries.
In scientific contexts the BTU has largely been replaced by the SI unit of energy, the joule, though it may be used as a measure of agricultural energy production (BTU/kg).
It is still used unofficially in metric English-speaking countries (such as Canada), and remains the standard unit of classification for air conditioning units manufactured and sold in many non-English-speaking metric countries."
Excerpt taken from Wikipedia®, text reproduced under the Creative Commons Attribution-ShareAlike License.
