1. What is an In Floor Heating Calculator?

Definition: This calculator estimates the heating load required for radiant floor heating systems based on floor area, heat requirements, and floor factors.

Purpose: It helps HVAC professionals and homeowners determine the appropriate heating capacity for in-floor heating systems.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( Q \) — Heating load (BTU/h)
• \( A \) — Floor area (square feet)
• \( BTU/ft² \) — Heat requirement per square foot (BTU/h·ft²)
• \( F_f \) — Floor factor (adjustment for floor type)

Explanation: The floor area is multiplied by the heat requirement and adjusted by the floor factor to account for different floor materials and insulation levels.

3. Importance of Heating Load Calculation

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

4. Using the Calculator

Tips: Enter the floor area in square feet, heat requirement (default 25 BTU/h·ft²), and floor factor (default 1.0). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's a typical BTU/ft² requirement?
A: Most residential spaces need 20-30 BTU/h·ft², but this varies by climate and insulation.

Q2: How do I determine the floor factor?
A: Use 1.0 for concrete, 0.8 for wood over concrete, and 1.2 for suspended wood floors.

Q3: Should I include the entire floor area?
A: Only include areas that will be heated - exclude permanent fixtures and cabinets.

Q4: How does insulation affect the calculation?
A: Well-insulated spaces may use lower BTU/ft² values (20-25), while poorly insulated spaces may need higher values (30-40).

Q5: Does this account for heat loss?
A: The BTU/ft² value should account for expected heat loss based on your climate and building envelope.