How long does it take to Heat a Pool

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One of the most popular pastimes for many people all around the world is swimming. However, not everyone can or wants to visit their nearest beach or swim center. For this exact purpose, people have swimming pools in their backyard or even indoors. 

However, living in colder climates comes with its own troubles, one of these being the water is too cold to take a dip in. Brrrrr! 

Luckily due to advancements in technology, there is a solution to this problem. Get yourself a pool pump heater. One of the nicest feelings in the world is getting in a warm pool on a cold day. It’s like taking a hot shower, but with some friends and very few items of clothes on (they don’t mention this part in the brochure). 

Now you’ve got yourself a pool pump heater. Obviously, your next question is how long does it take to heat it up? Worry not, this article is here to answer exactly that in the best manner possible. So, let’s take a look at how long it takes to heat up an average pool. Based on the size of your pool, these times might vary. 

How Long Will It Take To Heat My Pool?

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There are a few factors that come into play when trying to answer this question. The size of the pool, the type of heating system being used and the climate all play a part in how long it takes for a swimming pool to be heated. 

These variables play a part a major part in determining the amount of time it’ll take to heat your pool. Luckily, there are tools out there that can help you with this exact task, tools like this pool heat calculator. All you have to do is input some basic information about your pool and it will give you an idea of how long it takes to heat up a certain sized pool at this link

If you prefer you can also use the following basic formula: 

Convert the pool’s volume (in gallons) to heat rise (in degrees Fahrenheit): 

heat rise = gallons / BTU Size of Heater = Number of hours

For a pool that is 20,000 gallons and you would like it heated to 78°F, the calculation would be: 

20,000 gallons × (78°F – 60°F) = 360,000 / (For example 12,000 BTUs)

360,000 / 12,000 BTUs = 30 hours 

So, it would take about 30 hours to heat a 20,000-gallon pool using a 12,000 BTU pool heater.

Though keep in mind that if the ambient temperature is below 50°F, pool pump heaters will not work as efficiently and they will require a little too much time and power to heat the water. 

How Does A Pool Water Heater Pump Work?

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A pool pump heater consists of two main parts: the heat pump and the control box. The heat pump extracts heat from the surrounding air and transfers it to the swimming pool water. The control box regulates the temperature of the water and turns the pump on and off as needed. 

The system work with the heat pump drawing in warm air from the surrounding atmosphere and forcing it through a narrow passageway, which contains a series of small fans. These fans move the air over coils that are filled with a special liquid called refrigerant. Then, the refrigerant gas changes back into a liquid and absorbs the heat from the air. 

The heated liquid is then pumped through to the control box, which is mounted next to your swimming pool. The control box contains a thermostat that regulates the temperature of the water. When the desired temperature is reached, it will turn off the pump. 

Also Read: Heat Pump Vs Solar Pool Heating – Which Is Better? 

How Fast Will A Pool Pump Heater Heat My Pool?

Generally speaking, an average-sized pool can take anywhere from 12 to 24 hours to heat fully, depending on the weather conditions and the type of heating system being used. If you’re using a gas heater, it will usually take less time than if you’re using an electric heater. 

Pool pump heaters come in a variety of sizes, so you need to make sure you get the right one for your pool. You’ll also need to make sure that your pump heater is compatible with your existing pump system. 

In climates where temperatures regularly drop below freezing, it is recommended that you use a gas heating system in order to ensure your pool is heated in a timely manner. Electric heating systems can take up to twice as long to heat a pool in cold weather conditions. 


Some key things to remember when shopping for a pool pump heater are the size of your pool, what kind of heating system you will use and where you live. Another thing would be to make sure the pump heater you choose is compatible with your existing pump system. 

Generally speaking, an average-sized pool will take anywhere from 12 to 24 hours to heat fully, depending on the weather conditions and the type of heating system being used.

So, there you have it! Everything you need to know about how long it takes to heat a swimming pool. Now go enjoy those long winter days by taking a nice, warm swim!

Happy swimming!

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