1. What is a Wall Heater Size Calculator?

Definition: This calculator estimates the appropriate wall heater size in watts based on the room's square footage.

Purpose: It helps homeowners and contractors determine the right heater capacity for efficient room heating.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( W \) — Heater size in watts
• \( S \) — Room area in square feet

Explanation: The standard rule of thumb is that you need about 10 watts of heating power for each square foot of space.

3. Importance of Proper Heater Sizing

Details: Correct heater sizing ensures energy efficiency, proper heating, and prevents overloading electrical circuits.

4. Using the Calculator

Tips: Simply enter your room's square footage to get the recommended heater size in watts.

5. Frequently Asked Questions (FAQ)

Q1: Why 10 watts per square foot?
A: This is a standard guideline for well-insulated spaces in moderate climates. Adjustments may be needed for different conditions.

Q2: When would I need more than 10 watts/sq ft?
A: In colder climates, poorly insulated rooms, or rooms with high ceilings, you might need 12-15 watts per square foot.

Q3: What if my room is very small?
A: Most wall heaters have a minimum size (typically 400-500 watts), so very small rooms may need the minimum size.

Q4: Does this work for all heater types?
A: This calculation is specific to electric resistance wall heaters. Other types (gas, heat pumps) have different sizing requirements.

Q5: Should I round up the wattage?
A: Yes, it's generally recommended to round up to the nearest standard heater size available.