![]() Here are some general room sizes and the BTU required to heat them to a certain temperature:įamily bathroom with double glazed windowĢ.72m L x 2.39m W x 2.4m H = 15.6 x 121.5 (allowance for double glazed windows) = 1896 BTU You are now ready to perform your BTU calculation, using the tables below:.Next, you have to take into account heat loss: (If you have an odd-shaped layout, divide the room into separate rectangles and measure each one separately) Measure the length, width and height in metres and note this down. Here are some typical examples below (but you may prefer your room to be warmer or cooler): ![]() Take into account the type of room you are looking to heat-is it a bathroom, bedroom, kitchen, dining room, living room or hallway?ĭifferent room types, generally, require slightly different temperatures.How to work out the correct BTU output for your room So it's important you know how to calculate the BTU for your room. Buy one with a BTU output that is too low, and you simply won’t get enough heat, meaning you’ll have it cranked up to maximum the whole time. Whereas the Aziz heated towel rail 700 x 400 has a BTU output of 431, meaning it really is only suitable for keeping towels warm, not for heating a whole room.īuy heating with a BTU output that is too high for your room, and you’ll literally be burning extra cash on unnecessary energy bills. For example, the Salvador anthracite grey double vertical radiator has a BTU output of 5618, meaning it is suitable for heating very large rooms. In simple terms, the higher the BTU, the greater the heat output. If you remember any of your science lessons in school or actually want to know the technical detail, 1 BTU is equal to 1055 joules and is the amount of energy needed to heat 0.45kg (1lb) of water by -17☌ (1☏). If you’ve only just come across the term, welcome to the club! BTU stands for British Thermal Unit, and is the standard way to work out how much heat output is required to keep your room warm. Luckily, help is at hand, and it comes in the form of three simple letters: BTU. Choosing the perfect radiator or heated towel rail is difficult enough, but knowing whether it is suitable to heat your room is another matter entirely. When updating your home, one of the trickiest things to consider is your heating. They were left in this form so that you could calculate a more accurate conversion factor.Do you know which size radiator or heated towel rail you need for your room? No? Well, in this guide, we’ll show you how to calculate your required BTU, even without using a calculator! For example, converting calorie per hour (IT) to watts, 4.0 is 4.1868 divided by 60, divided by 60 which is equal to 0.001163. Note that you must first complete the operations in the Multiply By column in order to have the correct factor. So, to convert directly from BTU/h (th) to cal/s (th) you multiply by 0.069998829. Or, you can find the single factor you need by dividing the A factor by the B factor.įor example, to convert from BTU/h (th) to cal/s (th) you would multiply by 0.2928751 then divide by 4.184. To convert among any units in the left column, say from A to B, you can multiply by the factor for A to convert A into W then divide by the factor for B to convert out of W. To convert from W into units in the left columnĭivide by the value in the right column or, multiply by the reciprocal, 1/x.ġ4.653555 W / 0.2930711 = 50 BTU/h Multiply by the value in the right column in the table below.ĥ0 BTU/h * 0.2930711 = 14.653555 W To simply convert from any unit into W, for example, from 50 BTU/h, just Where S is our starting value, C is our conversion factor, and How to Convert Units of Power and Heat FlowĬonversions are performed by using a conversion factor. By knowing the conversion factor, converting between units can become a simple multiplication problem: Convert among units of power and heat flow.
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