Radiator BTU Calculator UK

Radiator BTU Equation:

\[ BTU = (\Delta T \times 1404 \times Area) \]

BTU Output (per hour):

Unit Converter ▲

Unit Converter ▼

From:	To:

1. What is the Radiator BTU Calculator?

The Radiator BTU Calculator estimates the heat output of radiators based on temperature difference and surface area. It uses the UK standard calculation method to determine BTU (British Thermal Unit) output per hour for proper heating system design.

2. How Does the Calculator Work?

The calculator uses the standard UK radiator equation:

\[ BTU = (\Delta T \times 1404 \times Area) \]

Where:

\( BTU \) — British Thermal Units output per hour
\( \Delta T \) — Mean water temperature minus room temperature in Kelvin
\( 1404 \) — UK conversion factor from W/m²K to BTU/h
\( Area \) — Radiator surface area in square meters

Explanation: The equation calculates heat output based on the temperature difference between radiator water and room air, multiplied by the radiator's surface area and the standard UK conversion factor.

3. Importance of BTU Calculation

Details: Accurate BTU calculation is essential for proper heating system design, ensuring rooms are adequately heated without energy waste. It helps select the right size radiators for each room based on heat loss requirements.

4. Using the Calculator

Tips: Enter temperature difference in Kelvin (standard is 50K for typical UK systems) and radiator surface area in square meters. Both values must be positive numbers for accurate calculation.

5. Frequently Asked Questions (FAQ)

Q1: What is the standard ΔT value used in UK calculations?
A: The standard temperature difference is 50K, representing typical system temperatures of 75°C flow, 65°C return, and 20°C room temperature.

Q2: How do I measure radiator surface area?
A: Surface area is typically provided by manufacturers. For custom calculations, measure height and width, then consult manufacturer charts or use specific calculation methods for different radiator types.

Q3: Why use 1404 as the conversion factor?
A: 1404 is the standard UK factor that converts from Watts per square meter Kelvin to BTU per hour, accounting for UK measurement standards and typical system efficiencies.

Q4: Does this calculation comply with UK standards?
A: Yes, this calculation follows BS EN 442 standards for radiator testing and performance rating in the UK market.

Q5: Can I use this for different temperature systems?
A: Yes, adjust the ΔT value according to your specific system temperatures. Lower temperature systems will require larger radiators for the same heat output.