1. What is a Radiator Size Calculator?

Definition: This calculator estimates the required radiator size in kilowatts (kW) based on room area for UK homes.

Purpose: It helps homeowners and heating engineers determine the appropriate radiator output needed to effectively heat a room.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( P_{kW} \) — Radiator size (kilowatts)
• \( A_{room} \) — Room area (square meters)

Explanation: The formula converts British Thermal Units (BTUs) to kW, using 44.6 BTU per square foot (converted to m²) divided by 3412 (BTU to kW conversion).

3. Importance of Correct Radiator Sizing

Details: Proper radiator sizing ensures efficient heating, prevents energy waste, and maintains comfortable room temperatures.

4. Using the Calculator

Tips: Simply enter your room area in square meters. The result shows the recommended radiator output in kilowatts.

5. Frequently Asked Questions (FAQ)

Q1: Is this calculation suitable for all room types?
A: This provides a base calculation. Bathrooms may need 10-20% more, while well-insulated rooms may need less.

Q2: What about room height?
A: The standard calculation assumes 2.4m ceilings. For higher ceilings, multiply the result by (your ceiling height/2.4).

Q3: Does this account for windows?
A: No, for rooms with large windows, add 10% to the calculated value per window.

Q4: What if my room is north-facing?
A: North-facing rooms typically need 10-15% more heating power than calculated.

Q5: How accurate is this calculator?
A: It provides a good estimate, but for precise calculations consider professional assessment including insulation factors.