\u00a9 2023 wikiHow, Inc. All rights reserved. It is important to know what heat output is required from both the radiator and the room it is going in. This design value, when translated into a real building, may or may not be achieved by the builder. I need 1000 watts/3412 BTU Use the BTU Calculator / Heat Loss Calculator at the bottom of this page to determine the outputs you need for each room. They look like original radiators from the Victorian era but deliver moden heating efficiency. A double panel radiator the same size puts out 2597 BTUs of heat. However, BestHeating's BTU calculator is a good guide as to what level of BTU and Watt output will efficiently heat your room. cd. Calculate the square footage of one section of the radiator. See Building Regulations And U-values: How have they changed? Central heating radiator sizes tend to have a BTU output between 600 10,000. A temperature of O C is the freezing point of water whilst this would be 273.15 K. Likewise 0 K would be -273.15 C. Q: What are the U-values required by the current Building Regulations for a new home or extension?See post Building Regulations: Current U-values for Insulation in Homes. Electric radiators are controlled individually and simply require a mains electricity supply to work. Radiator size calculator With the information above, you can work out what size radiator (s) your home needs. Then enter information about the walls using the pull down menu or alternatively enter specific u-values if you know them. Occasionally the procedure can show up leaks in the system or highlight the need for a new radiator but it will ensure your heating works as efficiently as possible. Standard radiator sizes at Stelrad are between 700mm x 1400m at the smallest, and 600mm x 2400mm at the largest. Use a calculator to determine your exact needs. January 12, 2022. Use our BTU Calculator to determine the heat requirements of your room. 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