1. What is an Indoor Pool Heater Sizing Calculator?

Definition: This calculator estimates the required heater size for indoor pools based on surface area, evaporation rate, and ventilation load.

Purpose: It helps pool designers and facility managers determine the appropriate heater capacity to maintain comfortable water temperatures.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( \text{Size} \) — Required heater capacity (BTU/h)
• \( \text{Surface Area} \) — Pool surface area (square feet)
• \( \text{Evaporation Rate} \) — Heat loss through evaporation (BTU/h per sq ft)
• \( \text{Ventilation Load} \) — Additional heat loss from air exchange (BTU/h)

Explanation: The surface area multiplied by evaporation rate gives base heating needs, then ventilation requirements are added.

3. Importance of Proper Heater Sizing

Details: Correct sizing ensures energy efficiency, maintains consistent water temperature, and prevents equipment overworking.

4. Using the Calculator

Tips: Enter pool surface area, typical evaporation rate (default 1000 BTU/h sq ft), and ventilation load (default 50,000 BTU/h). All values must be ≥ 0.

5. Frequently Asked Questions (FAQ)

Q1: What affects evaporation rate?
A: Water temperature, air temperature, humidity, and pool activity levels all influence evaporation rates.

Q2: How do I determine ventilation load?
A: Consult HVAC professionals who can calculate based on your facility's air exchange requirements.

Q3: What's a typical evaporation rate?
A: Most indoor pools use 800-1200 BTU/h per sq ft, with 1000 being a common average.

Q4: Should I oversize my heater?
A: Generally size 10-20% larger than calculated to account for extreme conditions and faster heat-up times.

Q5: Does this include heat loss through walls?
A: No, for pools with significant wall exposure, add 10-15% to the calculated size.