solar panels

How Many Solar Panels to Heat a Pool?


How Many Solar Panels to Heat a Pool?

Do you want swim warm water in heat a pool. The swimming season can be extended by keeping your pool comfortably heated with solar pool heating, which is economical and environmentally suitable.

Solar panels can assist in raising the temperature of your pool’s water without using conventional heating techniques by utilizing the sun’s energy.

In this post, we will study the variables to consider when approximating the number of solar panels needed to heat your pool accurately.

As it depends on weather and sunlight these things can be a disadvantage of solar panels.
If you go to the market they will show a couple of solar panel heaters each with his own specific benefits. There will be a large number of suggestions and at this point you may be confused about how much heater you want to heat a pool.

But for making it simple for you we provide some guidelines for your help. There are some things that are important to see : your location, type of solar panel, shade area, panel performance reviews and the swimming pool for which you want to buy heaters.

The relationship between the surface and pool size is directly proportional. That means if your pool size is big then you need to buy a solar panel heater with a large surface. And this is not as difficult as you think it is.

As Australia is blessed with lots more sunshine than other countries, and the panels we will recommend you do not need much energy to warm your pool. In this article we will study about how much solar panels you need and which suits your needs. Here you will find heaters with less money and more benefits.

Important Things Before Buying a solar penal

There are some important things that you have to take in mind while purchasing a solar panel to heat a pool. The first one is to match the heating systems of the heater and your pool. Further primary things are your location, the surface area of the pool and most important to know what your heating goals are? like for how long you want to enjoy your swimming season.

And if you know your goals then you are able to know how much solar panels you need to heat your pool and which system you have to select. There are a huge number of heaters all have their different advantages.

How is solar pool heating implemented?

Solar panels, sometimes called collectors, are used by solar pool heating systems to harvest solar energy. Typically, these panels are mounted on the ground or roof with their backs to the sun. Pumps circulate pool water through solar collectors, where it is heated by the sun. The pool temperature is then increased by adding the heated water back in.

Sitting a Solar Swimming Pool Heater’s Collector

Usually collectors are mounted near to the swimming pool or on roofs that can provide proper orientation, exposure and tilt in front of sun. The things that affect your pool in heating performance are tilt and orientation and tilt of the collector.

Collector orienting

Collector should be orientated at that place where they get the most of the energy of the sun on daily and seasonal base. And if we talk about the recent study, the average temperature can be 45 degrees east or west of south and in this temperature it can decrease its performance.

The factor you also have to take in mind are following;

  • Solar collector tube
  • filter
  • pump
  • flow control

Collector tilt

In which angle you have to tilt your collector depends on the length and latitude of your swimming season.

If you just want collectors for summer then you have to tidy 10°-15° angle angle to your latitude, and for year-round you have to tidy them equal to your latitude. Well it proven by studies that if you don’t tidy it at an optimum angle it will not affect overall performance.

How Do You Measure Your Pool?

how to measure pool size 1

It’s critical to precisely measure your swimming pool before determining how many solar panels you’ll need. Calculate the pool’s width, length, and average depth. The volume of the pool in cubic feet or meters can be determined by multiplying these parameters collectively. This measurement will be essential for determining how much heating your pool will need. There following more detailed information about measuring your pool size:

Solar panels are used according to the size of the surface, not with its volume. We consider it because he loses his heat from the surface via evaporation on a surface.

So for measurement of solar panels we uses some formulas, if your pool shape is geometrically then the measurement is easy because this is in free form but if its shape is “free form” or “kidney” then this may be a little difficult.

If you pool shape is geometrical then you can use the following formula:
πr² you can use it for circular pool shape.
L x W this can be used for rectangular shape.
Moreover for other shapes like for oval shape you just have to use length by width multifunction formula.

How to measure pool size with Google maps

There is following step by step guide to measure your pool size via google maps:

  • 1.At first give your address into the search bar then click to enter. 2.There will be a “satellite” labeled image at the lower left hand corner of the map.
  • 3.Start zooming to your address via mouse wheel, laptop touchpad or given +/- of map.
  • 4.First do a right click on any place of your pool after that hit the “Measure distance” option.
  • 5.Start creating multiple points for getting the diameter of your pool. Whenever 6.your click the direction will change the reason is this that you are creating an outline of your pool.
  • To re edit your selection: you can erase it by right click on anywhere and then simply click to the clear measurements and it will be erased.
  • 7.When you make a complete outline of your pool then simply foe ending it click again on the very first point you made. After this you will see at the bottom of your screen the “total area” of the pool. You can use it to know the needed surface area.

You can use it to measure available roofs space
Moreover the satellite images are near to accurate but it’s not always 100% accurate so if possible do the measurements again with hand.

How do I determine the cost of solar pool heating?

You must consider the pool’s size, location, environment, and intended temperature increase to determine the approximate number of solar panels needed. Professionals in solar heating utilize intricate calculations to calculate the precise requirements, accounting for elements such as sun insolation, panel efficiency, and heat loss. You can obtain a precise calculation customized to your pool’s requirements by speaking with a qualified solar pool heating installer.

If you want to determine the costs of your solar panel pool heating then you need to have following information;

  • Performance rating of thermal collectors
  • Collector panels total number
  • Total cost of system to be installed

If you know the rating then you can use the following formula:

Btu × # of collector panels ÷ cost of installed system

As an output you will get the spendable dollars.

But if you have only pricing and thermal performance rating then you can use the following formula;

Btu/day divided by collector price = spent dollars

How hot can a sun cover heat a pool?

Sun blankets and coverings, commonly referred to as sun covers, can maintain heat in your pool. They serve as a barrier, halting the radiation and evaporation of heat. While solar covers can considerably help maintain pool temperature, they depend entirely on solar radiation to heat the water. A solar cover can, on average, boost the pool’s temperature by some degrees, but its primary motive is to trap heat rather than produce it.

How can I speed up the heating of my pool?

There are numerous actions you can do to optimize the heating process:

  • Using a pool cover ensures optimum insulation when the pool is unused.
  • Increase the solar panels’ exposure to the sun by optimizing their orientation and placement.
  • Maintain clear, clean water in the pool since dirt and algae can prevent heat transfer.
  • To improve water circulation and heat distribution, consider adopting a pool pump with adjustable speed settings.

Should More Solar Panels Be Installed to Ensure Excellent Heating Performance?

Pool heating efficiency can be improved by adding more solar panels. However, balancing the number of panels with the size and heating requirements of the pool is essential. Speaking with a qualified installer, you may find out how many solar heating panels are best for your pool configuration. if we talk in detail then

The answer is no you can’t increase the heating of your pool by installing more solar panels heaters, like if you think you install 200% coverage the heating temperature will increase 20 degrees it will not. There is a major point in it that is diminishing return, when the pool water temperature will be the same as the heater temperature, it starts decreasing heating performance.

If we talk about solar thermal systems such as solar pools, there is not any big difference then the heater temperature that transfers heat to the pool water.

That’s why we don’t recommend our users install more heaters than 100% coverage. Although the large number or heater can make the pool warm faster in the morning.

And if you want to swim early in the morning then this 100% coverage may be suitable for you.

Can a sun cover be left on the pool all day?

While leaving a solar cover on the pool for the long term is usually secure, it is good to take it off when the pool is being used to avoid any safety risks. The swimming experience is improved by allowing the sun’s energy to heat the water when the cover is removed directly.

What is a comfortable pool temperature?

Depending on personal comfort and intended use, different people may prefer different pool temperatures. But a cozy pool temperature frequently falls between 77°F (25.7 C), 83°F (27.6 C). Finding the ideal balance that meets your preferences while considering elements like the weather and the age range of pool users is crucial. The you can increase with the help of a solar panel is 5°C to 8°C.

How solar panel works

how solar panel work

Very first the water flows from a filter which is heated by 1,2 or more solar panels, and after this it comes back to the pool. You can utilize the collectors to chill the pool in hottest months of the season.

For creating a solar panel pool, many different types of materials are used. This depends on your needs such as it depends on your environment and your plan to utilize it. By taking these needs into mind, you are able to choose a certain type of solar panel.

If you want your pool to be warm only in the above temperature months then the unglazed collector system will suit best to your needs. Without having a glass cover collectors are unglazed. For using them lifelong they are made with rubber or plastic that has been treated by the best ultraviolet light inhibitors.

This unglazed type of solar panel is less expensive than the glazed type. They are cheap because of their cheap material and design which is straightforward.

Most included things into a solar system are following:

  • Solar collector tube
  • filter
  • pump
  • flow control

Through the filter the water is pumped and after this from the solar collectors, this is the place where the water starts heating before coming back to the pool.

And in the hot climate you can use them to cool the pool water during the hottest months of the year.

How to select a solar pool heater

how to select a solar panel

The total cost of buying and installing a solar can approach up to 2500 to 4000 dollars. 1 to 7 years of playback provides the playback duration depending on your available solar resources and local fuels costs. They provide you a larger longer service as compared to gas or heat pump pool heaters. The cost which you spend on a solar panel depends on many factors. So if you want to buy a solar pool heating system then you must have to apply the following steps;

  • Determine your site’s solar recourse
  • Determine the real size
  • Determine the suitable tilt and orientation for collector
  • Check the system efficiency
  • Compare the available system prices
  • Take a look at local codes, covenants and regulations.

Determine your site’s solar recourse

A solar panel provides its full performance when it is before a right site of a solar.
So it needs to look at the site’s solar resource before the buying and installing processes. As I said, it will provide you with the best performance as long as the sun’s energy reaches them.

Both direct and diffuse solar reduction are used in a solar pool heating system. If you live in the southwest of the United States where’s climate isn’t warm and stays sunny most of the time, then the solar resource of your site might be adequate.

And if not and your site is an unshaded area which is generally in the south then it will be a good climate for your heating system.

Determine the real size of pool

The factor which are counted in sizing of a pool are following ;

  • Size of pool
  • Swimming season length
  • Regional temperature
  • pool temperature you want
  • Solar recourse of site
  • Orientation and tilt of collector
  • Efficiency of collector
  • Pool cover use

Determine the Efficiency of Solar Swimming Pool Heating System

If the thermal performance rating are available then the process of determination is easy you can use the BTU (British thermal unit) per square feet day
Formula is Btu/ft square day.

After the process you got the energy efficient.

How to Calculate solar coverage offset

In general terms the heating system of a solar pool is anywhere from 50% to 100% by the total area of surface of a swimming pool. For example: “50% offset” means you are going to start matching 50% surface area of the pool by the total solar panels surface area.

Let your pool surface area be 400 square feet, for this 400, 50% offset means you need a 200 square feet solar panel for your pool.

If we also enlist reference then a single 4×12.5 will be the area of 50 square feet solar panel surface, so the system which have this then his total surface area will be 200 square feet

If you want your pool for 3 to 4 months in a swimming season: if you are funding to add some more heat during these summer months then 50% offset can be sufficient.

Or you want 4 to 5 months of swimming season: for this you have to aim for 60% to 80% range as this will help you in heating your pool into shoulder months.

8 to 10 month swimming season needy people who want full season extension has to select for 85% to 100%< offset.

For better explain there given a following example:
Swimming pool size: 16’×32’ (rectangular)
Swimming pool surface area: 512 square feet
Heating goal: 4-5 months
Solar System Offset: 75%
Rec surface area of solar panel: 384 square feet.

Climate considerations before installing a solar penal

Before locating a solar panel you also have to know how long your winter months could be. As we know solar panels only work when the sun is out and shining. They need to be winterized for those months of winter when the temperature drops 41 degrees. They have to be isolated and the pools have to be shut down during winters.

Because of this all climate zones are not capable to achieve the full spring extension. And if you live like these cold places then you can’t run your solar in these cold months. And the 50 to 80 percent will be perfect for you if you want to run it for 4 to 6 months in a year.

Solar panel Optimizing Efficiency

The other figures to consider are direction of solar panel, their plumbing method and sun exposure each day. These solar panels work at their optimal performance when their direction towards the South, if the plumbing is parallel and they take the full exposure at day time.

You have to take a solid beneath if you want to install solar panels in the ground structure this will make a way for the wind to pass through. Take in mind that the system doesn’t have to be installed at a pitch which is greater than 45 degrees.

what is Automated solar panel system

If a system has automatic control this can be effective in providing maximum heating performance that means this will maximize heat performance. And this can also effect on avoiding your solar panel actual time cooling inadvertently in the inclement weather.

We recommend our users to install a controller that will increase performance and customer satisfaction. If you manage closely to the manual system this can also perform near to the automatic system. But a huge number of owners change their value when the need comes.
And this cannot overclock the convenience of an automated system.

Different types of pool heaters

There is a following list of solar panel heaters you may like them

  • DualSun
  • Rigid panels
  • Rubber/strip matting
  • Heat Pumps
  • Gas


It basically a two in one solar panel you can use it for heating your pool and for solar pc solution. it can do both of function like heating and cooling. For working on optimal performance it helps your solar panels up to 50%.
This can be a good thing for those people who want solar panels for their limited roof space. With this they can also offset their household usage and they can perform these both task at the same time.

Ragit solar panels

These panels are for those people who have plenty of suitable roof space, Rigit panel is good for them. We are recommending this because of their durability. if you used to buy premium brand than you have to use this it comes with a warranty of 10 years.

Rubber/strip matting

The people who used to live in birdlife area, as they are not cockatoo proof so you have to avoid these systems. Further the people who want to buy they can find a Rubber matting and their running costs in the market.

Heat Pumps

This heater is know as his affective way of heating the pool, but for using it’s this quality you have to buy an efficient model with inverted technology. AS they are effective in heating, so their cost is also high then others. The people who already have solar panel at their roofs used solar pump to heat their pool. Best thing in solar pump is they have manual controller of time, So you can easily run during the day time.

If the solar panels are operating then most of the homes who have less space often install and use pool heat pump. The reason if its small size it takes less space like an air-condition.


Gas – this used to be the go-to pool heating solution, but as the cost of gas has increased exponentially over the last few years, many people are looking at alternate pool heating solutions.
Gas is a go to heating solution but when the costs of gas are high people are looking an alternative of gas pool heating system. Soler panel system can be alternative but it staring investment is high.

Benefits of a solar pool heating system

Are you going to install a solar pool heating system to heat your pool, there benefits are following:

  • up to 4-6 weeks you can extend your swim season
  • The full day cost will be just 1$ to run
  • you can increase water temperature up to 46F
  • More easy and effective way to heat a pool
  • Footprint of carbon are almost zero
  • Maintenance will be low
  • solar panels are environmentally friendly.

Pros and Cons


1. warrantee You receive solar panels warrantee for a long period.

2.Lifetime saving You Save your money over more then 15 years with the solar panels system with the small investment.

3.Reducing power bill solar panels help you in Reducing power bill.

4.non-renewable resources solar panels Decreases the use of non-renewable resources.


1.upfront costs For using solar panels you to pay high upfront costs.

2.Sunlight dependent you need the sunlight to use full performance of a solar panels.

(FAQs)-Frequently Asked Questions

Do solar panels function in colder environments?

Even in colder climates, solar panels can be helpful, albeit their effectiveness may vary. The panels can absorb sunshine in colder climates, changing it into thermal energy. Extreme cold or icy circumstances, however, might impact their performance. Combining solar heating with an additional heating source could be essential to guarantee an adequate pool temperature in these circumstances.

How much do solar panels cost to heat a pool?

Depending on the pool size, the number of solar panels needed, and the particular installation requirements, the price of solar panels for pool heating may vary. Solar panel heating needs a starting investment, but because it depends less on conventional heating methods, it can result in everlasting money savings.

Can I put in solar panels myself to heat my pool?

A professional installation is strongly advised, even if installing solar panels for pool heating can be done as a do-it-yourself effort. Many technical considerations go into solar pool heating systems, including optimal panel positioning, plumbing connections, and system integration. Professional installers know what is necessary to guarantee top performance, safety, and adherence to local laws.

What is the lifespan of solar pool heating systems?

With the correct maintenance and care, solar pool heating systems may often last 15 to 20 years. The lifespan may vary based on elements, including component quality, installation, climatic conditions, and routine maintenance. Regular inspections and upkeep can help the system last longer.

 How many solar panels to run a pool heat pump

its depends on How Do You Measure Your Pool size and when your know the measurement then you could easily select how much solar panel you need to run a pool heat pump.


You may benefit from a warm pool using less energy and leaving a smaller carbon imprint if you incorporate solar pool heating into your pool system. Extend your swimming season and create a comfortable swimming environment by installing the ideal amount of solar panels for your pool.

You should seek personalized counsel from a reputed solar pool heating expert if you have any more queries or need more detailed assistance—Utilize solar energy to improve your pool experience and practice sustainability.

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