Radiator Size Formula:
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Definition: This calculator estimates the optimal radiator size in kilowatts (kW) based on room volume for UK homes.
Purpose: It helps homeowners and heating engineers determine the appropriate radiator size for efficient room heating.
The calculator uses the formula:
Where:
Explanation: The room volume is multiplied by 44 watts per m³ (0.044 kW/m³) to determine the required radiator output.
Details: Correct radiator sizing ensures efficient heating, prevents energy waste, and maintains comfortable room temperatures.
Tips: Measure your room dimensions accurately and enter the total volume in cubic meters. The result shows the recommended radiator size in kW.
Q1: How do I calculate room volume?
A: Multiply room length × width × height in meters. For example, 5m × 4m × 2.5m = 50m³.
Q2: Why is 0.044 used in the formula?
A: This is the standard UK heating requirement of 44 watts per m³ for a well-insulated room.
Q3: When should I adjust the calculation?
A: Increase by 10-20% for rooms with large windows, poor insulation, or north-facing walls.
Q4: What if my room is irregularly shaped?
A: Calculate volume for each section separately and sum the results.
Q5: Does this work for all radiator types?
A: Yes, the kW requirement is the same regardless of radiator style (panel, column, etc.).