1. What is a Radiator Size Calculator?

Definition: This calculator estimates the required radiator power output based on room area.

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

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( P_{kW} \) — Radiator power output (kilowatts)
• \( A_{room} \) — Room area (square meters)
• 44.6 — Standard heat requirement (BTU per hour per m²)
• 3412 — Conversion factor (BTU/hr to kW)

Explanation: The formula converts the standard heat requirement from BTU to kW to determine the appropriate radiator size.

3. Importance of Radiator Sizing

Details: Proper radiator sizing ensures efficient heating, energy savings, and comfortable room temperatures.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: Why is 44.6 BTU/hr/m² used?
A: This is a standard value for average heat requirements in moderately insulated rooms.

Q2: Should I adjust for room type?
A: Yes, consider increasing by 10-20% for bathrooms or rooms with large windows.

Q3: What about room height?
A: This calculation assumes standard ceiling heights (2.4-2.7m). For higher ceilings, multiply by height factor.

Q4: How does insulation affect this?
A: Well-insulated rooms may need 10-15% less power, while poorly insulated rooms may need 20-30% more.

Q5: Can I use this for underfloor heating?
A: No, this is specifically for radiator sizing. Underfloor heating requires different calculations.