1. What is a Radiator Calculator BTU?

Definition: This calculator estimates the heat output required from a radiator based on temperature difference, heat transfer coefficient, and surface area.

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

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 Radiator Sizing

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

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 surface area.

5. Frequently Asked Questions (FAQ)

Q1: What's a typical ΔT for UK central heating?
A: Most UK systems use ΔT50°C (flow 75°C, return 65°C, room 20°C).

Q2: How do I find my radiator's K-value?
A: Check manufacturer specs - typical values range from 10-12 W/m²·K.

Q3: What if my radiator isn't standard?
A: Use manufacturer-specific data or consult a heating engineer.

Q4: How do I convert between Watts and BTU?
A: 1 Watt = 3.412 BTU/h (conversion is automatic in this calculator).

Q5: Should I add extra capacity?
A: Consider adding 10-20% for rooms with high heat loss (large windows, poor insulation).