1. What is a BTU Calculator for UK Radiators?

Definition: This calculator estimates the heat output of radiators in both Watts and BTU/h based on temperature difference, heat transfer coefficient, and surface area.

Purpose: It helps homeowners and heating engineers determine the appropriate radiator size for rooms in UK homes.

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 coefficient and surface area gives the heat output in Watts, which is then converted to BTU/h.

3. Importance of Accurate Heat Output Calculation

Details: Proper heat output estimation ensures comfortable room temperatures, energy efficiency, and correct radiator sizing.

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 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 the mean water temperature in the radiator and the desired room temperature (typically 50°C in UK systems).

Q2: What's a typical K value for radiators?
A: Standard panel radiators are about 11 W/m²·K, while designer radiators might be 7-9 W/m²·K.

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?
A: Watts are standard in the UK, but BTU is still commonly used in radiator specifications.

Q5: Does this include heat loss factors?
A: No, this is the radiator's output. For room requirements, consider insulation, windows, etc.