Home Back

How To Calculate Radiator Size

Radiator Size Formula:

\[ BTU = Room Volume (m³) \times 25-35 \]

Unit Converter ▲

Unit Converter ▼

From: To:

1. What Is Radiator Size Calculation?

Radiator size calculation determines the appropriate heating capacity in BTU (British Thermal Units) needed to effectively heat a room based on its volume and insulation quality.

2. How Does The Calculator Work?

The calculator uses the radiator size formula:

\[ BTU = Room Volume (m³) \times Insulation Factor \]

Where:

Explanation: The formula accounts for room size and insulation quality to determine the heating capacity required for optimal comfort.

3. Importance Of Proper Radiator Sizing

Details: Correct radiator sizing ensures efficient heating, prevents energy waste, maintains comfortable room temperatures, and extends heating system lifespan.

4. Using The Calculator

Tips: Enter room volume in cubic meters and select insulation factor based on your room's insulation quality. Room volume must be greater than 0.

5. Frequently Asked Questions (FAQ)

Q1: What is BTU and why is it important?
A: BTU (British Thermal Unit) measures heating capacity. Proper BTU calculation ensures your radiator can adequately heat the room.

Q2: How do I calculate room volume?
A: Multiply room length × width × height in meters. For example: 4m × 5m × 2.4m = 48m³.

Q3: What insulation factor should I choose?
A: 25 for new/well-insulated rooms, 30 for average insulation, 35 for older/poorly insulated rooms or rooms with large windows.

Q4: Are there other factors to consider?
A: Yes, consider window size, room orientation, number of external walls, and ceiling height for more accurate sizing.

Q5: Can I use this for whole house calculations?
A: Calculate each room separately as insulation and heating requirements vary by room.

How To Calculate Radiator Size© - All Rights Reserved 2025