Electric Heating Design. 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. The best assessment of the heating needs of a house will be done by the addition of the results for each room. heat capacity (kW) Electric heaters: Volume (m³) x Factor 0.041 = Req. heat capacity (kW) Old buildings with average insulation. Using the same size room as described in the first calculation method, we'll assume that our 144-square-ft. bedroom has one window and two exterior walls but is otherwise typical. 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. Calculations for circulation heater applications. Now, divide by 250 to arrive at the length of baseboard heater required. If you require: A heating design for an entire property; A room size guide for an old building with poor insulation; A room … ... Volume (m³) x Factor 0.058 = Req. Step 2: Calculate the required KW: [3333 SCFM x (400°F-350°F)]/3193 = 52 KW . Our simple electric heating room size guide is ideal for calculating the number of heaters required to heat one or two rooms. How many BTUs are needed to heat a room? 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. In North America we still can find BTU/hr being used as a measure of power in heating. The resulting number will be the total wattage required for baseboard heaters to heat the room. 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. Once you punch in that information, the calculator will tell you the BTU/hr required. The room’s length, width, ceiling height, and insulation, as well as the lowest outside temperature, are all considered on the Total Home Supply calculator. The formula to convert BTU to kW is the following: P(kW)= P(BTU/hr)/ 3412.14. 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. ... 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. When calculating the power required to heat a material flowing through a circulation heater, the KW equation shown below can be applied. 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. Calculate your heating requirements. 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