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BTU/hr = Pool Volume gal × 8.33 × Temp Rise °F / Hours
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The Raypak Pool Heater Sizing Calculator helps determine the appropriate heater capacity (in BTU/hr) needed to efficiently heat your swimming pool based on pool volume, desired temperature rise, and heating time.
The calculator uses the standard pool heating formula:
Where:
Explanation: This formula calculates the energy required to raise the temperature of your pool water by the specified amount in the given time frame.
Details: Proper heater sizing is crucial for energy efficiency, cost-effectiveness, and optimal performance. An undersized heater will struggle to maintain desired temperatures, while an oversized heater may cycle too frequently, reducing efficiency and lifespan.
Tips: Enter pool volume in gallons, desired temperature rise in °F, and desired heating time in hours. All values must be positive numbers for accurate calculation.
Q1: Why is 8.33 used in the formula?
A: 8.33 represents the weight of one gallon of water in pounds, which is necessary for the BTU calculation (1 BTU raises 1 pound of water by 1°F).
Q2: What is a typical temperature rise for pools?
A: Most pools are heated to 78-82°F. A typical temperature rise ranges from 10-20°F above the starting water temperature.
Q3: How do I calculate my pool volume?
A: For rectangular pools: Length × Width × Average Depth × 7.5. For circular pools: Radius² × 3.14 × Average Depth × 7.5.
Q4: What factors affect heater sizing besides volume?
A: Ambient temperature, wind exposure, pool cover usage, and desired heating time all impact the required heater size.
Q5: Should I round up the calculated BTU requirement?
A: It's generally recommended to round up to the nearest available heater size for a safety margin, especially in colder climates or for pools with high heat loss.