1. What is a Radiator kW Size Calculator?

Definition: This calculator converts heating load in BTU/h to radiator size in kilowatts (kW), which is the standard measurement for radiators in the UK.

Purpose: It helps homeowners and heating engineers determine the appropriate radiator size needed for a room based on its heat requirements.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( P_{kW} \) — Radiator size in kilowatts
• \( Q_{btu} \) — Heating load in British Thermal Units per hour

Explanation: The formula converts BTU/h to kW using the conversion factor 3412 BTU/h = 1 kW.

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: Enter the room's heating load in BTU/h (from a heat loss calculation). The value must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: How do I find my room's heating load?
A: Use a heat loss calculator or consult a heating engineer who can calculate it based on room size, insulation, and other factors.

Q2: Why convert BTU/h to kW?
A: UK radiators are rated in kW, while many heat loss calculations provide results in BTU/h.

Q3: Should I round up the radiator size?
A: Yes, it's common practice to round up to the nearest available radiator size for a safety margin.

Q4: Does this account for different radiator types?
A: No, this is a basic conversion. Different radiator types (e.g., panel, convector) may have different outputs at the same kW rating.

Q5: What's a typical kW requirement for a room?
A: A well-insulated living room might need 1-2kW, while a bathroom might need 0.5-1kW, but always calculate properly.