Indoor Pool Heater Sizing Calculator

Heating Requirement Formula:

\[ Q = m \times c \times \Delta T + Q_{\text{latent}} \]

Water Mass:

Specific Heat Capacity:

BTU/lb·°F

Temperature Difference:

°F

Latent Heat Loss:

BTU

Heating Requirement (BTU):

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1. What is an Indoor Pool Heater Sizing Calculator?

Definition: This calculator determines the heating requirement for an indoor pool based on water mass, temperature difference, and latent heat loss.

Purpose: It helps pool owners and professionals properly size pool heaters for indoor installations where evaporation is reduced.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ Q = m \times c \times \Delta T + Q_{\text{latent}} \]

Where:

\( Q \) — Total heating requirement (BTU)
\( m \) — Mass of water (pounds)
\( c \) — Specific heat capacity of water (1.0 BTU/lb·°F)
\( \Delta T \) — Desired temperature increase (°F)
\( Q_{\text{latent}} \) — Additional latent heat loss (BTU)

Explanation: The formula calculates both sensible heat (temperature change) and latent heat (evaporation and other losses).

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 in pounds, specific heat capacity (default 1.0 for water), desired temperature increase, and any additional latent heat loss. All values must be ≥ 0.

5. Frequently Asked Questions (FAQ)

Q1: How do I calculate water mass?
A: Multiply pool volume (gallons) by 8.34 (weight of 1 gallon of water).

Q2: Why is latent heat lower for indoor pools?
A: Indoor pools have reduced evaporation due to lower air movement and higher humidity.

Q3: What's a typical temperature difference?
A: Usually 15-20°F between desired water temp and make-up water temp.

Q4: Should I include other heat losses?
A: Yes, account for pool cover effectiveness, ventilation, and building insulation.

Q5: How does this differ from outdoor pool calculations?
A: Outdoor pools require more latent heat calculation for evaporation and wind effects.