1. What is an Electric Heat kW Calculator?

Definition: This calculator converts heat input in BTU/h to electrical power requirements in kilowatts (kW) for electric heating systems.

Purpose: It helps HVAC professionals and engineers determine the electrical power needed to achieve a specific heating output.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( P_{kW} \) — Electrical power (kilowatts)
• \( Q_{btu} \) — Heat input (BTU per hour)
• 3412 — Conversion factor (BTU/h to kW)

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

3. Importance of Electric Heat Calculation

Details: Accurate power calculation ensures proper sizing of electrical heating systems, prevents circuit overloads, and optimizes energy efficiency.

4. Using the Calculator

Tips: Enter the heat input in BTU/h. The value must be greater than 0. The calculator will automatically compute the equivalent power in kW.

5. Frequently Asked Questions (FAQ)

Q1: Why is the conversion factor 3412?
A: 1 kW is equivalent to 3412.142 BTU/h based on the International System of Units conversion.

Q2: Does this account for system efficiency?
A: No, this calculates theoretical power. For actual requirements, divide by system efficiency (typically 0.95-1.0 for electric heat).

Q3: Can I use this for heat pump calculations?
A: No, heat pumps have different efficiency factors (COP). This is for pure electric resistance heating.

Q4: How do I find my heat input in BTU/h?
A: Check equipment specifications or calculate from heat loss/gain requirements of your space.

Q5: What's a typical kW range for residential electric heaters?
A: Common residential electric heaters range from 1.5 kW to 5 kW (5,000-17,000 BTU/h).