1. What is a BTU Calculator for Radiators?

Definition: This calculator estimates the heat output of radiators in both Watts and BTU/h based on UK standards.

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

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 characteristics and size determines its heat output.

3. Importance of Accurate BTU 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), K-value (default 11.0 W/m²·K for standard panels), and radiator surface area.

5. Frequently Asked Questions (FAQ)

Q1: What is ΔT in radiator calculations?
A: It's the difference between mean water temperature in the radiator and the desired room temperature (typically 50°C in UK systems).

Q2: What are typical K values for radiators?
A: Standard steel panel radiators are about 11 W/m²·K, while double panel convectors can be 22 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 account for room insulation?
A: No, this calculates radiator output only. Heat requirements depend on room size, insulation, and windows.