1. What is the Screwfix Radiator BTU Calculator?

The Screwfix Radiator BTU Calculator estimates the heat output of radiators based on length and temperature difference. This formula is commonly used in the UK for quick radiator sizing estimates, particularly with Screwfix products.

2. How Does the Calculator Work?

The calculator uses the Screwfix radiator BTU formula:

Where:

• \( Length \) — Radiator length in millimeters (mm)
• \( \Delta T \) — Temperature difference between radiator and room in degrees Celsius (°C)
• \( 1.4 \) — Standard coefficient for radiator heat output
• \( 20 \) — Standard temperature difference reference point

Explanation: The formula provides a quick estimate of radiator heat output based on physical dimensions and operating conditions.

3. Importance of BTU Calculation

Details: Accurate BTU calculation is essential for proper radiator sizing, ensuring adequate room heating while avoiding energy waste from oversized radiators.

4. Using the Calculator

Tips: Enter radiator length in millimeters and temperature difference in degrees Celsius. Typical ΔT values range from 30-50°C for standard central heating systems.

5. Frequently Asked Questions (FAQ)

Q1: What is ΔT in radiator calculations?
A: ΔT (delta T) is the temperature difference between the mean water temperature in the radiator and the room air temperature.

Q2: How accurate is this calculation method?
A: This provides a rough estimate. For precise calculations, consult manufacturer specifications and consider room insulation, windows, and other factors.

Q3: What is a typical ΔT value for UK homes?
A: Standard central heating systems typically operate at ΔT of 50°C (flow 75°C, return 65°C, room 20°C).

Q4: Can I use this for all radiator types?
A: This formula works best for standard panel radiators. Column radiators and other types may have different heat output characteristics.

Q5: How do I convert BTU/h to watts?
A: Multiply BTU/h by 0.293 to get watts (1 BTU/h = 0.293071 W).