1. What is a Radiator Heat Output Calculator?

Definition: This calculator estimates the heat output of radiators according to UK standards (B&Q), based on temperature difference, heat transfer coefficient, and surface area.

Purpose: It helps homeowners and heating engineers properly size radiators for UK homes to ensure efficient heating.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

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

Explanation: The temperature difference multiplied by the radiator's heat transfer properties and size gives the heat output.

3. Importance of Radiator Calculation

Details: Proper radiator sizing ensures comfortable room temperatures, energy efficiency, and prevents under/over heating.

4. Using the Calculator

Tips: Enter the temperature difference (typically 50°C for UK systems), K-value (default 11.0 W/m²·K for standard radiators), and surface area. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is ΔT in radiator calculations?
A: It's the difference between mean radiator temperature (flow + return)/2 and room temperature.

Q2: What's a typical K-value for UK radiators?
A: Standard panel radiators are about 11 W/m²·K, while convector radiators may be higher.

Q3: How do I find my radiator's surface area?
A: Check manufacturer specifications or measure height × width × number of panels.

Q4: Why show both Watts and BTU/h?
A: Watts are standard in the UK, but BTU/h is still commonly used in radiator specifications.

Q5: Does this account for room insulation?
A: No, this calculates radiator output. Heat requirements depend on room size, insulation, and heat loss.