1. What is a Radiator Size Calculator for UK?

Definition: This calculator estimates the required radiator size in kilowatts (kW) based on room area for UK homes.

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

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( P_{kW} \) — Radiator power output (kilowatts)
• \( A_{room} \) — Room area (square meters)
• 44.6 — British Thermal Units (BTU) per square meter factor
• 3412 — Conversion factor from BTU to kW

Explanation: The room area is multiplied by the standard BTU requirement per square meter, then converted to kilowatts.

3. Importance of Correct Radiator Sizing

Details: Proper radiator sizing ensures efficient heating, prevents energy waste, and maintains comfortable room temperatures.

4. Using the Calculator

Tips: Measure your room area in square meters and enter the value. The calculator will determine the recommended radiator size in kW.

5. Frequently Asked Questions (FAQ)

Q1: Why is 44.6 BTU/m² used in the calculation?
A: This is the standard heat requirement for a moderately insulated room in the UK climate.

Q2: Should I adjust for room height?
A: The standard calculation assumes 2.4m ceiling height. For higher ceilings, multiply the result by (your ceiling height/2.4).

Q3: What about room insulation?
A: For poorly insulated rooms, add 15-20% to the result. For well-insulated rooms, subtract 10-15%.

Q4: How many radiators should I have?
A: One radiator per 5-6m² is typical, but larger rooms may need multiple radiators to distribute heat evenly.

Q5: What if my room has large windows?
A: Add 10% to the calculated size for each large window in the room.