1. What is a Radiator Size Calculator?

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

Purpose: It helps homeowners and heating professionals determine the appropriate radiator size for efficient room heating.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( P_{kW} \) — Radiator size (kilowatts)
• \( A_{room} \) — Room area (square meters)
• 44.6 — BTU per square meter constant
• 3412 — Conversion factor from BTU to kW

Explanation: The room area is multiplied by the heating requirement constant (44.6 BTU/m²) and converted to kW.

3. Importance of Proper Radiator Sizing

Details: Correct radiator sizing ensures efficient heating, energy savings, and prevents under- or over-heating of rooms.

4. Using the Calculator

Tips: Simply enter the room area in square meters. The value must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What does the 44.6 constant represent?
A: It's the average British Thermal Unit (BTU) requirement per square meter for standard room heating.

Q2: Should I adjust for room type?
A: Yes, consider increasing by 10-20% for bathrooms or 15-25% for kitchens due to higher heat loss.

Q3: What about room insulation?
A: Well-insulated rooms may need 10-15% less heating capacity, while poorly insulated rooms may need more.

Q4: How does ceiling height affect this?
A: For ceilings higher than 2.4m, multiply the result by (actual height/2.4) for accurate sizing.

Q5: Can I use this for whole-house calculations?
A: Yes, calculate each room separately and sum the results for whole-house radiator requirements.