1. What is BTU for Radiators?

BTU (British Thermal Unit) measures the amount of heat required to raise the temperature of one pound of water by one degree Fahrenheit. For radiators, BTU/h indicates the heating capacity needed to effectively warm a room.

2. How Does the Calculator Work?

The calculator uses the standard UK radiator sizing formula:

Where:

• \( Volume \) — Room volume in cubic meters (m³)
• \( Factor \) — Insulation factor ranging from 25-35

Explanation: The factor accounts for room insulation quality - lower values for well-insulated rooms, higher values for poorly insulated spaces.

3. Importance of Correct Radiator Sizing

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

4. Using the Calculator

Tips: Calculate room volume (length × width × height in meters), select appropriate insulation factor based on your room's characteristics.

5. Frequently Asked Questions (FAQ)

Q1: What if my room has large windows?
A: Add 10-15% to the calculated BTU for rooms with large or poorly insulated windows.

Q2: How do I calculate room volume?
A: Measure length, width, and height in meters and multiply: Length × Width × Height = Volume in m³.

Q3: What insulation factor should I choose?
A: 25 for modern well-insulated rooms, 30 for average insulation, 35 for older poorly insulated rooms.

Q4: Can I use this for entire house calculation?
A: Calculate each room separately as insulation and size vary, then sum the BTUs for whole-house requirements.

Q5: What about room orientation?
A: North-facing rooms may need 10% more BTU, south-facing rooms 10% less than calculated.