1. What is a Radiator Heat Output Calculator?

Definition: This calculator estimates the heat output of radiators based on their dimensions, height factor, and temperature difference (Delta T).

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

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• Output — Heat output in Watts (converted to BTU/hr)
• Length — Radiator length in meters
• Width — Radiator width in meters
• Height Factor — Multiplier for radiator height (typically 1.0)
• ΔT — Temperature difference between radiator and room in °C

Explanation: The calculation accounts for radiator surface area and the temperature difference that drives heat transfer.

3. Importance of Heat Output Calculation

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

4. Using the Calculator

Tips: Enter dimensions in meters, height factor (default 1.0), and Delta T (typically 50°C for UK systems). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is Delta T in radiator calculations?
A: Delta T is the difference between radiator surface temperature and desired room temperature (typically 50°C in UK systems).

Q2: When would I change the height factor?
A: Adjust for tall radiators (factor >1) or low radiators (factor <1) based on manufacturer specifications.

Q3: Why are results shown in both Watts and BTU?
A: Watts are standard in the UK, but BTU is still commonly used in some specifications.

Q4: How accurate is this calculator?
A: It provides estimates. For precise calculations, consult manufacturer data sheets.

Q5: Does this include heat loss compensation?
A: No, consider adding 10-20% for rooms with high heat loss (e.g., north-facing or poorly insulated).