1. What is a Pool Heater Sizing Calculator?

Definition: This calculator determines the appropriate BTU capacity needed for a pool heater based on water mass, temperature difference, and heat loss factors.

Purpose: It helps pool owners and professionals select the correctly sized heater for efficient and effective pool heating.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( Q \) — Required heater capacity (BTU)
• \( m \) — Mass of water to be heated (pounds)
• \( c \) — Specific heat of water (1.0 BTU/lb·°F)
• \( \Delta T \) — Desired temperature increase (°F)
• \( Q_{latent} \) — Additional heat for evaporation/wind loss (BTU)

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

3. Importance of Proper Heater Sizing

Details: Correct sizing ensures efficient operation, prevents energy waste, and extends heater lifespan while maintaining comfortable water temperatures.

4. Using the Calculator

Tips: Enter the pool water mass in pounds, specific heat (default 1.0 for water), desired temperature increase, and any additional heat requirements for evaporation or wind loss.

5. Frequently Asked Questions (FAQ)

Q1: How do I calculate water mass?
A: Multiply pool volume in gallons by 8.34 (weight of 1 gallon of water). For example: 20,000 gal × 8.34 = 166,800 lb.

Q2: What's a typical temperature difference?
A: Usually 15-20°F for seasonal heating, or 2-5°F for maintaining temperature overnight.

Q3: When would I need latent heat?
A: In windy areas or for outdoor pools where evaporation is significant. Typically 10-20% of sensible heat.

Q4: What if my pool is in-ground vs. above-ground?
A: In-ground pools generally need less additional heat as they're better insulated by the ground.

Q5: Should I round up the BTU result?
A: Yes, it's recommended to round up to the nearest standard heater size available.