How long does it take for a pool to heat up by the sun?

Who needs a pool heater when you can heat your pool with sunlight? But is it really useful? If you also have similar questions in your mind, then all your questions will be answered in this post.

Heating a pool by the sun is the most affordable way to enjoy a warm bath in your collection; however, is it enough to enjoy the sweet warmth of the water on your pool?

Well, it is possible to enjoy a hot bath in your pool by using solar energy to heat it. With an effective setup, you can enjoy your free heater whenever you want (at least in the daytime).

Table Of Contents

Heating a pool with sun

If you want to heat a pool with the sun, you need a proper solution. Your pool must be able to absorb the heat to warm the pool water. All you need is a black water hose for the stream. Connect it to your tap and leave it in the direct sunlight. It absorbs the heat energy and gives you warm water when it comes out of the tap. 

Although this process is slow, you can still heat water for free. On average, the time to take for a pool to heat up by the sun is 8 to 12 hours. Also, note that you may not get your desired temperature only with the sun. You can increase its heating rate and more temperature by using a solar cover.

A solar cover traps the heat and keeps the pool water warm. This process requires a one-time investment and works without any maintenance cost.

Factors affecting the heating of your pool water by the sun

As we mentioned earlier, it takes around 8-12 hours for a pool to heat up by the sun. However, the numbers can vary as many other factors can influence this process.

Some of them are:

Water temperature

The starting water temperature of the pool plays a crucial role in it. If the water is warmer than the average temperature, it will take less time to heat the sun’s pool water. On the other hand, if it is colder than the average water temperature (less than13-degree Celsius), then you may need to wait a little longer to enjoy your pool bath.

Heat loss

Every material has a different ability to absorb heat. Hence, heat loss can be another crucial factor in this process. You can improve the heat by using a solar sheet to absorb the sunlight for a longer time.

Sunlight angle

The best angle to heat a pool by the sunlight is 90-degree. If it deviates from this angle, you may see a decrease in the pool water’s heating rate.

How long does it take to heat a pool with solar panels?

Using solar panels is another excellent way to heat the pool water conveniently. However, this one-time investment may disappoint some of our readers. It costs you some money to buy and install your solar panels, but the effective heating makes it up for all the struggle and expenses. The best thing about this solution is that you can enjoy warm water for a longer time. If on a location of average weather temperature is between 20°C to 28 °C and the size of an inground pool is 15 Feet by 30 Feet and assuming that, it can hold up to 13000-15000 Gallon of water, then, solar heating can warm by around 2.0-3.5ᵒ C in a day. Use a wireless pool thermometer to check the time it takes to get your preferred water temperature.

How long does it take for a pool to warm up with a heater

The heating time of a swimming pool with heater or heat pumps depends on a few factors, such as heater or heat pump capacity, pool size, air temperature, and your desired temperature. 

Heater or Heat Pump Capacity

To reduce your pool heating time, you can follow the heat pump sizing chart, if you are interested in a pool heater, then check for the accurate pool heater size. Every heater or heat pump manufacturer provides a clear sizing chart according to pool size vs required BTU or Kw.

Pool Size

A larger pool will require more time, however, if you have enough size of heater or heat pump, then, 8-12 hour is enough for a medium-sized (12000-15000 Gallon) inground pool.

Air Temperature

Surrounding air temperature is also a factor, especially, if you are heating with a heat pump, as the heat pump collects the heat from the surrounding air. For better efficiency of a heat pump, air temperature should be above 10 degrees Celsius.

Although you can heat your pool water by direct sunlight, there are many other effective solutions to heat a pool. It is because sunlight takes a lot of time to heat the pool water. Getting a pool heater can save you a lot of struggle in heating your pool water. Hence, you can use a solar panel or gas heater for the job. It will reduce the heating time and keep the water warm for a longer time. 

That is why experts believe that using a gas heater is the best way to heat a pool quickly.

What is the best to heat the pool water? Solar panels or gas heater or heat pump? 

A solar panel heater traps the sunlight and uses it to heat the pool water with its pump and filter. It requires a one-time investment and heats your pool for free for a long time. On the other hand, a gas heater uses fuel to heat the water. Hence, this process is way faster than solar panels but requires much more investment than a solar panel.

You will need to add natural gas every time you want to heat your pool with your gas heater.

Final words

Heating the pool water with the sunlight is practical. Sunlight will also help you to reduce pool chlorine level on your pool However, you need some patience as the process may take up to 10 hours to heat it completely. That is where you can use other options like Solar panel heater and gas heater. They are much more effective and provides better results in a short time.

People looking for a one-time investment can choose a solar panel heater as it comes with minimum maintenance costs. On the other hand, you can use a gas heater for quickly heating your pool water with some additional fuel costs.

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