To get the most out of your pool a heater is a necessity. The right heater will extend your swimming season by weeks or months, and make even the cloudiest summer day perfect for swimming. There are many types and styles of heaters, but only one will reliably heat your pool in a matter of no time with the flick of a switch. Natural gas heaters will heat your pool faster than electric or solar heaters, and unlike the latter they don’t require clear skies to run. Whether it's day or night, natural gas heaters will heat your pool to the perfect temperature.
If you are considering purchasing a natural gas pool heater, be aware that there are some things you should consider. Millivolt natural gas heaters still use a constantly burning pilot light which is less efficient than more modern models, and can occasionally be difficult to relight. Modern natural gas heaters use an electric ignition switch similar to a gas stove. These electronic ignition versions are much more efficient (because they don’t expend gas on a constantly burning pilot light), but they do require an electrical connection.
Natural gas heaters are inexpensive to purchase, and are arguably the most reliable pool heaters available on the market. However, they are not as environmentally friendly and are more expensive to install than solar and electric heaters. You cannot install a natural gas pool heater yourself. You’ll need to have a certified gas fitter hook your heater up to your existing gas line. However, if you’ve got a large pool or are looking for responsive heating, natural gas heaters are simply unrivaled. Electric and solar pool heaters simply don’t have the capacity to heat a large pool as quickly or consistently.
Heater Sizing Chart
| Pool Size | Gas Heater Size |
|---|---|
| 15' Round | 100,000 - 150,000 BTU |
| 18' Round | 100,000 - 200,000 BTU |
| 21' Round | 100,000 - 200,000 BTU |
| 24' Round | 150,000 - 250,000 BTU |
| 27' Round | 200,000 - 300,000 BTU |
| 12' x 24' | 100,000 - 200,000 BTU |
| 14' x 28' | 150,000 - 250,000 BTU |
| 16' x 32' | 200,000 - 300,000 BTU |
| 18' x 36' | 200,000 - 300,000 BTU |
| 20' x 40' | 250,000 - 350,000 BTU |
Note: All figures above are approximate and based on a constant depth of 48" and a desired temperature increase of 10 degrees. Use only as a guideline and add a solar cover to your pool for best results.
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