Match a heater or combination of heaters to the wattage required per room to estimate what you need to buy/specify to heat a given room. Measuring Heat Output. The BTU requirement will be for the whole room, so you need to calculate the total amount of space the room covers. This article will look at the ways to calculate such requirements, and will hopefully help you keep your living room warm when the colder months come around. Our simple electric heating room size guide is ideal for calculating the number of heaters required to heat one or two rooms. ... Volume (m³) x Factor 0.058 = Req. Kilowatt Calculator Our Kilowatt calculator lets you put in your room dimensions, select how well your home is insulated and then finds you matching stoves, sized to keep you cosy. heat capacity (kW) Old buildings with average insulation. Calculate your heating requirements. 1 kW (kJ/s) = 859.9 kcal/h = 3,413 Btu/h; T(o C) = 5/9[T(o F) - 32] Example - Heating a single room with air. When calculating the power required to heat a material flowing through a circulation heater, the KW equation shown below can be applied. The power required to heat the room is measured in Watts, all heaters have a nominated Wattage output noted as kW ( kilowatts), 1 kW = 1000 Watts. If you require: A heating design for an entire property; A room size guide for an old building with poor insulation; A room … Electric Heating Design. The best assessment of the heating needs of a house will be done by the addition of the results for each room. Once you punch in that information, the calculator will tell you the BTU/hr required. The formula to convert BTU to kW is the following: P(kW)= P(BTU/hr)/ 3412.14. In North America we still can find BTU/hr being used as a measure of power in heating. To do that you need to measure the length, width and height of the room so you can then calculate the cubic footage of each room by multiplying the length, width and height of the room. Using the “Water Heating Power Calculator” above (250 us gallons, start temperature 103f, end temperature 105f, 120min) tells us that a heating power of 611 watts is required. Calculations for circulation heater applications. ... For the decision of which kind of heater and the required heat capacity, the type and size of the room that needs to be heated are decisive. Step 2: Calculate the required KW: [3333 SCFM x (400°F-350°F)]/3193 = 52 KW . A building with a large room with a heat loss 20 kW is heated with air with a maximum temperature 50 o C. The room temperature is 20 o C. The required air flow rate can be calculated as. heat capacity (kW) Electric heaters: Volume (m³) x Factor 0.041 = Req. How many BTUs are needed to heat a room? 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