1. What is a Heater Size Calculator?

Definition: This calculator estimates the required heater size in BTUs (British Thermal Units) based on room area and heating factor.

Purpose: It helps homeowners and professionals determine the appropriate heater capacity for efficient room heating.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( BTU \) — Heating capacity required (BTU/hour)
• \( Area \) — Room area (square feet)
• \( Factor \) — Heating factor (BTU per square foot)

Explanation: The room area is multiplied by a heating factor that accounts for climate and insulation quality.

3. Importance of Proper Heater Sizing

Details: Correct heater sizing ensures energy efficiency, proper heating, and prevents equipment strain from over/under-sizing.

4. Using the Calculator

Tips: Enter the room area in square feet and heating factor (default 20 BTU/sq ft for moderate climates). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's the typical heating factor?
A: Standard is 20 BTU/sq ft, but use 30-40 for cold climates, 10-15 for warm climates, and 50+ for rooms with poor insulation.

Q2: Should I adjust for room height?
A: Yes, for ceilings over 8 feet, multiply the result by (ceiling height ÷ 8).

Q3: What about windows and insulation?
A: Add 10% for each window, 20% for poor insulation, or subtract 10% for excellent insulation.

Q4: Does this work for whole-house heating?
A: Yes, calculate each room separately then sum the BTUs, adding 10-20% for whole-house systems.

Q5: What if my heater size is between standard sizes?
A: Always round up to the next available size for best performance.