1. What is Pool Heater Sizing?

Definition: This calculator determines the BTU capacity needed for a pool heater based on water volume, desired temperature increase, and additional heat requirements.

Purpose: Helps pool owners and professionals select appropriately sized heaters for efficient and effective pool heating.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( Q \) — Total heat required (BTU)
• \( m \) — Mass of water (pounds)
• \( c \) — Specific heat of water (1.0 BTU/lb·°F)
• \( \Delta T \) — Desired temperature increase (°F)
• \( Q_{\text{latent}} \) — Additional heat for evaporation, etc. (BTU)

Explanation: The formula calculates the sensible heat needed to raise water temperature plus any additional latent heat requirements.

3. Importance of Proper Heater Sizing

Details: Correct sizing ensures efficient operation, prevents energy waste, and maintains comfortable water temperatures.

4. Using the Calculator

Tips: Enter water mass (1 gallon ≈ 8.34 lb), specific heat (1.0 for water), desired temperature increase, and any additional heat needs.

5. Frequently Asked Questions (FAQ)

Q1: How do I calculate water mass?
A: Multiply gallons by 8.34 (lb/gal) or calculate volume (L × W × D × 7.48 for rectangular pools).

Q2: What's typical ΔT for pools?
A: Usually 15-20°F for seasonal heating, but depends on climate and desired temperature.

Q3: When would I include latent heat?
A: For outdoor pools (accounting for evaporation) or when heating during use (replenishment).

Q4: How does this relate to heater size?
A: Divide total BTU by desired heating time (hours) to get required BTU/hr rating.

Q5: What about heat loss factors?
A: Consider adding 10-20% to account for wind, humidity, and nighttime cooling.