1. What is an Electric Furnace BTU Calculator?

Definition: This calculator converts the electrical power input (in kW) of an electric furnace to its heat output in BTUs per hour.

Purpose: It helps HVAC professionals and homeowners determine the heating capacity of electric furnaces and compare them with other heating systems.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( BTU \) — British Thermal Units per hour (BTU/h)
• \( kW \) — Kilowatt input of the electric furnace
• \( 3412 \) — Conversion factor (BTU per kW)

Explanation: Since 1 kW equals 3412 BTU/h, we simply multiply the kW rating by this constant to get the BTU output.

3. Importance of BTU Calculation

Details: Knowing the BTU output helps in sizing heating systems appropriately for spaces, ensuring efficient operation and comfort.

4. Using the Calculator

Tips: Enter the furnace's power input in kilowatts (kW). The value must be greater than 0.

5. Frequently Asked Questions (FAQ)

Q1: Why 3412 as the conversion factor?
A: 1 kW equals 3412.142 BTU/h exactly, as defined by the energy conversion standards.

Q2: Is this calculation 100% accurate for all electric furnaces?
A: This gives theoretical maximum output. Real-world efficiency might be slightly lower due to heat loss.

Q3: How do I find my furnace's kW rating?
A: Check the nameplate on the furnace or product specifications. It's often listed as "input power."

Q4: Can I use this for heat pumps?
A: Only for the electric resistance heating element. Heat pumps typically produce more BTUs than the kW input would suggest.

Q5: What's a typical kW rating for residential electric furnaces?
A: Common sizes range from 10 kW (34,120 BTU/h) to 30 kW (102,360 BTU/h) for whole-house systems.