Any of the many pool heaters you find on display at your local pool supply outlet will heat the water in your pool, from the small 100 unit (1000,000 BTU) all the way to the large 405s (405,000 BTU). Of course the smaller heaters will not heat the water as fast, and will probably turn on more often to maintain the heat in the pool, making them more expensive to run.
The temperature of your pool can be maintained by installing a wind breaking fence, a wall or a pool cover to keep the warmth in the pool this can significantly reduce the demands made on the pool heater you employ.
Pool Heater Recommendations
If you need a heater to heat a Pool/ Spa combo, then you will need a larger 400 BTU pool heater to warm the water in about 15 to 30 minutes. A thermal solar pool cover can help to reduce this time somewhat. Then there are more sophisticated spa tops that can conserve the heat till the moment of use, making the process very economical.
You should also consider the use you will be demanding from your pool. If you will be heating your pool intermittently, like on the weekends only. A larger heater for quick heat ups is the best option. These add a degree or more to the water temperature each hour.
You can check the manufacturer, say for example Pentair. They have calculation charts based on the size of your pool and also on how warm you would like it to be. Click here to determine What is the correct Pool Heater Size for My Pool.
On the other hand, if you will be keeping the pool warm constantly with the use of a thermostat, perhaps raising the temperature a degree or two at night or on an especially cold weekend, a smaller heater would prove more economical.
After factoring in the considerations mentioned above, use the following guideline to help decide which heater would be best for your pool, then go size larger to be sure the power will be sufficient.
-For Pools of 1,000 gals to 10,000 gals or up to 300 sq ft use 100 - 200 BTU heaters.
-For Pools of 10,000 gals to 20,000 gals gals or up to 500 sq ft use 200 - 300 BTU heaters
-For Pools of 2,000 gals to 40,000 gals or up to 1200 sq ft use 400 BTU heaters.
Final Note Wind is the biggest heat dissipator, other than children splashing about. To prevent spending on unnecessary heat loss, install a good pool cover, fense or even trees to keep the temperatures warm.
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