1. What is an Electric Radiator Size Calculator?

Definition: This calculator determines the required electric radiator size in kilowatts based on the heat output needed in BTU/hour.

Purpose: It helps homeowners, HVAC professionals, and engineers select properly sized electric radiators for heating spaces.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( P_{kW} \) — Radiator size (kilowatts)
• \( Q_{btu} \) — Heat output (BTU/hour)

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

3. Importance of Proper Radiator Sizing

Details: Correct sizing ensures efficient heating, prevents energy waste, and maintains comfortable temperatures without overloading electrical circuits.

4. Using the Calculator

Tips: Enter the required heat output in BTU/hour. The value must be > 0. The calculator will output the equivalent radiator size in kilowatts.

5. Frequently Asked Questions (FAQ)

Q1: Where does the 3412 conversion factor come from?
A: It's the exact conversion between BTU/hour and kilowatts (1 kW = 3412.142 BTU/h).

Q2: How do I determine the heat output needed for my space?
A: Calculate based on room size, insulation, and climate (typically 20-40 BTU per square foot).

Q3: Should I round up the calculated size?
A: Yes, it's recommended to round up to the nearest standard radiator size available.

Q4: Does this account for heat loss?
A: No, your heat output calculation should already account for expected heat loss in the space.

Q5: Can I use this for other electric heaters?
A: Yes, the calculation applies to any electric heating device where you need to convert BTU/h to kW.