1. What is a BTU Radiator Calculator?

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

Purpose: It helps determine the appropriate radiator size needed to heat a space effectively.

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.

3. Importance of Radiator Calculation

Details: Proper radiator sizing ensures efficient heating, energy savings, and comfortable room temperatures.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: What is ΔT in radiator calculations?
A: It's the difference between mean radiator temperature and 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 double panel convectors can be 22 W/m²·K.

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

Q4: What's the difference between Watts and BTU?
A: Both measure heat output, with 1 Watt = 3.412 BTU/h. UK radiators are typically rated in Watts.

Q5: Should I add extra capacity?
A: Yes, consider adding 10-20% to account for heat loss through windows, walls, etc.