1. What is an Underfloor Heating Output Calculator?

Definition: This calculator estimates the heat output of underfloor heating systems in BTU/h based on floor area and power density.

Purpose: It helps HVAC professionals and homeowners determine the heating capacity needed for comfortable underfloor heating.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

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

Explanation: The floor area is multiplied by the power density to get total Watts, then converted to BTU/h.

3. Importance of Heating Output Calculation

Details: Proper heat output estimation ensures comfortable room temperatures, energy efficiency, and correct system sizing.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: What is a typical power density for underfloor heating?
A: Most residential systems use 80-100 W/m², while bathrooms might use 100-150 W/m².

Q2: Why convert to BTU/h?
A: BTU/h is a common unit for heating capacity, especially in North America.

Q3: How does floor covering affect the calculation?
A: Thick coverings may require higher power density - consult manufacturer specifications.

Q4: Can I use this for electric and hydronic systems?
A: Yes, but power densities differ - electric typically uses higher W/m² than hydronic.

Q5: Should I include a safety factor?
A: Consider adding 10-15% to the calculated output for heat loss compensation.