1. What is an Electric Radiator Size Calculator?

Definition: This calculator converts the required heat output in BTU/h to the equivalent electric radiator size in kilowatts (kW).

Purpose: It helps homeowners and heating professionals determine the appropriate size of electric radiators for UK homes.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( P_{kW} \) — Radiator power (kilowatts)
• \( Q_{btu} \) — Heat output required (BTU per hour)

Explanation: The formula converts British Thermal Units to kilowatts using the conversion factor 3412 BTU = 1 kW.

3. Importance of Proper Radiator Sizing

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

4. Using the Calculator

Tips: Enter the required heat output in BTU/h (from a heat loss calculation). The value must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: How do I find my required BTU output?
A: Use a room heat loss calculator or consult a heating engineer for accurate BTU requirements.

Q2: Why 3412 BTU/kW?
A: This is the standard conversion factor (1 kW = 3412.14 BTU/h) used in heating calculations.

Q3: Should I round up the kW value?
A: Yes, it's recommended to round up to the nearest available radiator size for sufficient heating capacity.

Q4: Does this account for insulation levels?
A: No, your BTU requirement should already account for your room's insulation when using this calculator.

Q5: Can I use this for whole-house calculations?
A: This calculates per radiator. For whole-house systems, calculate each room separately and sum the totals.