Solar Pool Heater Size Calculator

Introduction: Enjoying a warm and inviting pool is a delightful experience, and solar pool heaters offer an energy-efficient solution to achieve just that. The Solar Pool Heater Size Calculator is designed to assist pool owners in determining the appropriate size of a solar pool heater based on specific factors. By considering pool volume, desired temperature increase, sunny days, and heater efficiency, this calculator provides tailored recommendations for an optimal swimming experience.

Formula: The recommended heater size is calculated using the formula: Heater Size (BTU) = Ceil((Pool Volume * Average Temperature Increase * 8.33) / (Efficiency * Sunny Days))

How to Use:

  1. Enter the pool volume in gallons.
  2. Input the desired average temperature increase in degrees Fahrenheit.
  3. Specify the number of sunny days your location experiences.
  4. Enter the efficiency percentage of the solar pool heater.
  5. Click the “Calculate” button to obtain the recommended heater size.

Example: Suppose your pool volume is 20,000 gallons, you desire an average temperature increase of 10°F, your location has 180 sunny days, and your solar pool heater has an efficiency of 80%. Upon clicking “Calculate,” the result will show the recommended heater size in British Thermal Units (BTU).


  1. Q: Can I use this calculator for any type of pool?
    • A: Yes, the calculator is suitable for both residential and commercial pool applications.
  2. Q: What is the acceptable range for heater efficiency?
    • A: Heater efficiency can range from 1% to 100%. Enter the specific efficiency percentage of your solar pool heater.
  3. Q: Is the result in BTU the actual size I need to purchase?
    • A: Yes, the result represents the recommended heater size in British Thermal Units.
  4. Q: How often should I recalculate my heater size?
    • A: It’s advisable to recalculate when there are changes in pool volume, desired temperature increase, or when considering system upgrades.
  5. Q: Can I use this calculator for an indoor pool?
    • A: The calculator is designed for outdoor pools that receive sunlight. Consider other heating options for indoor pools.

Conclusion: The Solar Pool Heater Size Calculator empowers pool owners to make informed decisions about the size of their solar pool heaters. By providing personalized recommendations based on specific parameters, this calculator contributes to energy-efficient and enjoyable pool experiences, allowing users to optimize their swimming environments while minimizing energy consumption.

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