Ditra Floor Heating Calculator

Heat Output Formula:

\[ Q = A \times BTU/ft² \times F_f \]

Heat Output (BTU/h):

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1. What is a Ditra Floor Heating Calculator?

Definition: This calculator estimates the heat output required for Ditra underfloor heating systems based on floor area, BTU rating, and adjustment factors.

Purpose: It helps installers and homeowners determine the appropriate heating capacity for radiant floor systems using Schluter®-DITRA underlayment.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ Q = A \times BTU/ft² \times F_f \]

Where:

\( Q \) — Heat output (BTU/hour)
\( A \) — Floor area (square feet)
\( BTU/ft² \) — Heat output rating per square foot
\( F_f \) — Adjustment factor for system efficiency

Explanation: The floor area is multiplied by the BTU rating and adjustment factor to account for heat loss and system efficiency.

3. Importance of Proper Heat Calculation

Details: Accurate heat output calculation ensures comfortable room temperatures, energy efficiency, and proper system sizing.

4. Using the Calculator

Tips: Enter the floor area in square feet, BTU/ft² rating (default 15 BTU/h·ft²), and adjustment factor (default 1.1). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's a typical BTU/ft² rating for Ditra systems?
A: Most systems range between 12-20 BTU/h·ft² depending on climate and floor covering.

Q2: Why is an adjustment factor needed?
A: It accounts for heat loss through subfloor and variations in installation conditions.

Q3: When should I increase the adjustment factor?
A: Use higher factors (1.2-1.3) for concrete slabs or rooms with high heat loss.

Q4: How do I measure floor area accurately?
A: Measure length × width of heated area, subtracting permanent fixtures.

Q5: Does this include the Ditra membrane's thermal resistance?
A: Yes, the default values account for standard Ditra underlayment properties.