How Your Pool’s Size Affects Your Heating Requirements
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In order to know what size of heating system you need for your pool, you will need to know how many gallons it holds. For the equations you’ll need to use to estimate this amount, please refer to the video above starting at 0:15.
After you know how many gallons your pool holds, you can then find the BTUs that your pool will need each day. You can see the equation for this at 0:37. This calculation requires using a recovery factor, which is the number of degrees that the heating system must be able to raise the pool each day to maintain a temperature when heat is lost overnight.
As I mentioned before, a pool that is not heated would match the outside average air temperature. So, if you wanted to keep a pool heated to 86 degrees in January when the average temperature is only 60 degrees, you will have to raise it 26 degrees just to counter the air temperature.
To calculate the recovery factor after this temperature difference is considered, there are many factors to evaluate: Average wind speed, shade from trees and buildings, if a blanket is used, where return locations in the pool are located, and depth, which is a large factor.
The pools that you see in the video at 3:00, although they look much different in terms of surface size, only have a 200,000-gallon difference. The depth of the pools greatly impacts the number of heaters required for the competition pool versus the diving pool. This is because there are less BTUs needed to heat a deeper pool with a smaller surface area compared to a shallower pool with the same volume. In this example, the competition pool requires eight heaters while the diving pool requires only three.
If you have any questions about this, please feel free to reach out to me. I look forward to speaking with you soon.