1. What is Underfloor Heating BTU Calculator?

Definition: This calculator estimates the BTU (British Thermal Units) output required for underfloor heating systems based on floor area and heating power density.

Purpose: It helps homeowners and heating professionals determine the appropriate heating capacity for underfloor heating installations.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( Q \) — Heating output (BTU/hour)
• \( A \) — Floor area (square meters)
• \( W/m² \) — Heating power density (Watts per square meter)
• \( 3.412 \) — Conversion factor from Watts to BTU/h

Explanation: The floor area is multiplied by the heating power density and then converted to BTU/hour for compatibility with many heating system specifications.

3. Importance of Underfloor Heating Calculation

Details: Proper BTU calculation ensures comfortable room temperatures, energy efficiency, and correct sizing of heating equipment.

4. Using the Calculator

Tips: Enter the floor area in square meters and heating power density (default 100 W/m²). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's a typical heating power density?
A: Most underfloor heating systems use 80-150 W/m², with 100 W/m² being common for residential applications.

Q2: Why convert to BTU/hour?
A: BTU is a standard measurement for heating capacity, especially in North America, making it easier to compare with heating system specifications.

Q3: How does floor covering affect the calculation?
A: Thick carpets or insulating materials may require higher wattage. Consider increasing W/m² by 10-20% in such cases.

Q4: Is this calculation for electric or hydronic systems?
A: The formula works for both, though electric systems typically use higher W/m² values than water-based systems.

Q5: Should I include the entire floor area?
A: Only include areas where heating is actually needed (excluding permanent fixtures like cabinets).