Radiant Heat Material Calculator

BTU Calculation Formula:

\[ Q = A \times \text{BTU/ft}^2 \times F_f \]

Heat Output (Q): BTU/h

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1. What is a Radiant Heat Material Calculator?

Definition: This calculator estimates the heat output (BTU/h) required for radiant heating systems based on area, BTU per square foot, and a correction factor.

Purpose: It helps HVAC professionals and homeowners determine the appropriate heating capacity for radiant floor or wall heating systems.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ Q = A \times \text{BTU/ft}^2 \times F_f \]

Where:

\( Q \) — Heat output (BTU/h)
\( A \) — Area to be heated (square feet)
\( \text{BTU/ft}^2 \) — Heat requirement per square foot
\( F_f \) — Correction factor for heat loss/type

Explanation: The area is multiplied by the BTU requirement per square foot, then adjusted by a factor accounting for system efficiency and heat loss.

3. Importance of Radiant Heat Calculation

Details: Accurate BTU calculation ensures proper system sizing, energy efficiency, and comfortable heating without under- or over-capacity.

4. Using the Calculator

Tips: Enter the area in square feet, BTU per square foot (default 30 BTU/h·ft²), and correction factor (default 1.2). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's a typical BTU/ft² value?
A: For radiant floors, 25-35 BTU/h·ft² is common, but this varies by climate and insulation.

Q2: What does the correction factor represent?
A: It accounts for heat loss through floors/walls, system efficiency, and temperature differentials.

Q3: When would I increase the correction factor?
A: For poorly insulated spaces, over concrete slabs, or in very cold climates.

Q4: How does this relate to material needs?
A: The calculated BTU determines the length of PEX tubing, boiler size, or electric mat capacity needed.

Q5: Should I add a safety margin?
A: Yes, consider adding 10-15% to the calculated BTU for optimal performance.