1. What is a Pentair Pool Heater Calculator?

Definition: This calculator estimates the required heater size (in BTU/h) for a swimming pool based on pool area, heating factor, and desired temperature increase.

Purpose: It helps pool owners and professionals determine the appropriate heater capacity for efficient pool heating.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( \text{Size} \) — Required heater capacity (BTU/h)
• \( \text{Pool Area} \) — Surface area of the pool (sq ft)
• \( \text{Factor} \) — Heating factor (typically 12.5 BTU/h sq ft °F)
• \( \Delta T \) — Desired temperature increase (°F)

Explanation: The formula calculates the heat energy needed to raise the pool water temperature by the specified amount.

3. Importance of Proper Heater Sizing

Details: Correct heater sizing ensures efficient operation, proper heating times, and prevents unnecessary energy costs.

4. Using the Calculator

Tips: Enter the pool area in square feet, heating factor (default 12.5 BTU/h sq ft °F), and desired temperature increase (default 20°F). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's a typical heating factor for pools?
A: Most pools use 10-12.5 BTU/h per sq ft per °F, with 12.5 being common for outdoor pools.

Q2: How do I determine my desired ΔT?
A: Subtract your average coldest water temperature from your desired swimming temperature.

Q3: Should I adjust the factor for indoor pools?
A: Yes, indoor pools typically need a lower factor (8-10) due to less heat loss.

Q4: How do I calculate my pool's surface area?
A: For rectangular pools: length × width. For circular pools: π × radius².

Q5: Does this account for heat loss factors?
A: The basic calculation doesn't account for wind exposure, humidity, or covers. Consider adding 10-20% for these factors.