1. What is a B&Q Radiator Size Calculator?

Definition: This calculator determines the required radiator size (heat output) based on temperature difference, heat transfer coefficient, and surface area according to UK standards (B&Q).

Purpose: It helps homeowners and heating engineers select appropriately sized radiators for efficient room heating.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( Q \) — Radiator size (Watts or BTU/h)
• \( \Delta T \) — Temperature difference between radiator and room (°C)
• \( K \) — Heat transfer coefficient (W/m²·K)
• \( A \) — Surface area of the radiator (m²)

Explanation: The formula calculates the heat output required to maintain the desired room temperature.

3. Importance of Proper Radiator Sizing

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

4. Using the Calculator

Tips: Enter the temperature difference (typically 50°C for UK systems), heat transfer coefficient (default 11 W/m²·K for standard radiators), and radiator surface area.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical ΔT value for UK systems?
A: Most UK heating systems use ΔT of 50°C (flow at 75°C, return at 65°C, room at 20°C).

Q2: How do I find the surface area of my radiator?
A: Measure height and width in meters and multiply, or check manufacturer specifications.

Q3: What K value should I use for different radiators?
A: Standard radiators ≈11, double panel ≈14, triple panel ≈16, aluminum ≈13 W/m²·K.

Q4: How do I convert Watts to BTU/h?
A: Multiply Watts by 3.412 to get BTU/h.

Q5: Should I add any safety factor?
A: It's common to add 10-20% to the calculated value for heat loss through windows and walls.