solar pool heater

Guide to solar pool heaters: what you need to know

Pool owners are fortunate to have a place to cool down during hot, sticky weather, but owning a pool is not without its pain points. In an effort to keep pools open for as long as possible, pool owners may spend a good amount of money on heating the water to comfortable swimming temperatures. If you have a pool and are finding yourself paying a lot to keep it warm, you should definitely consider renewable energy options for heating. While relying on warm weather to passively heat your pool is a good solution during the height of the summer, solar pool heaters are a great option to consider if you want to save money while extending pool season earlier into the spring and later into the fall.


Key takeaways


  • You can save money on pool heating costs and extend your pool season with solar pool heaters.
  • The surface area of the collectors for your solar pool heating system needs to be at least 50 percent of the surface area of your pool.
  • You should have a solar pool heating system installed by a professional to ensure the longevity of the system, but there are other great solar pool items for pool season you can get today.
  • Visit the EnergySage Marketplace to receive quotes from local installers and save money by powering your entire home with solar.

What’s in this article?

What are solar pool heaters?

Solar pool heaters use thermal energy from the sun to warm up your pool water. Similar to solar photovoltaic (PV) panels, solar energy collectors used to heat your pool are typically mounted on your roof. Water from your pool is pumped through a filter and up to the solar collectors on your roof. These solar collectors look similar to PV panels but include tubes throughout the inside so that pool water can circulate through the solar energy collector and absorb heat.

The best part about solar pool heaters? You can save money on pool heating costs! Heating a pool with solar energy is environmentally friendly and helps save you money because you’ll be relying on free energy from the sun instead of purchasing the fuel you would otherwise use to heat your pool. The amount you’ll save transitioning to a solar pool heater will depend on the existing source of heat for your pool, the efficiency of your system, the upfront cost, and other factors.

How do solar pool heaters work?

Solar pool heaters heat your pool water by pumping it through a filter and circulating it through tubes that transfer heat from solar energy collectors on your roof to the pool water. Many solar pool heaters also include flow control valves and automated sensors. These components detect the temperature of the water coming from the solar collectors compared to the desired temperature. If the pool water is cool and it’s sunny out, the flow control valve diverts water through the solar collectors, which heat the water before it’s returned back to your pool.  Alternatively, if your pool is too hot, the control valves ensure that additional hot water doesn’t enter your pool and warm it up even more.

solar pool heating system

Solar pool heater installation and operating costs

According to the Department of Energy, solar pool heaters will typically cost between $2,500 to $4,000 to install on your roof. Your payback period for this investment depends on how much you would otherwise spend on fuel to heat your pool, and how expensive energy costs are in your area. Most homeowners investing in solar pool heaters will break even on their investment in less than seven years.

The upfront investment of the system is the largest cost associated with this technology – operating and maintenance costs can be as low as $0 in a year if you do not need to fix or replace any parts. Properly installed, high-quality solar pool heaters should operate efficiently for 10 to 20 years.

Determining the size of your solar pool heater system

The size of your solar pool heating system will depend on a number of factors, including the size of your pool, the desired temperature for your pool, and how much sunshine the collectors will receive (dependent on your geography, tilt of the collectors, possible shading factors, etc.) You can install as many solar collectors as your roof is able to fit, but if your roof is covered in shade for most of the day, the solar collectors won’t meet your pool heating needs.

As a general rule of thumb, the surface area of your solar collector(s) should be 50 to 100 percent of the surface area of your pool. If you live in a climate where you’re using your pool for the majority of the year, you may consider sizing the system on the higher percentage end versus if you live in an area where you only swim in the pool for a few summer months.

Solar collector size estimates for typical home pool sizes

Pool sizeTotal pool surface areaLow end solar collector size requiredHigh end solar collector size required
10x20 ft200 sq. ft100 sq. ft200 sq. ft
15x20 ft300 sq. ft150 sq. ft300 sq. ft
20x40 ft800 sq. ft400 sq. ft800 sq. ft

A qualified contractor offering solar pool heaters will be able to properly size your system given the specifics of your pool and the location of the collector system. If you live in a climate with a lot of cloudy days or experience some shading on your roof where the solar collectors might go, your contractor may suggest keeping an electric backup system.

Buying a solar pool heater

Most solar pool heaters you’ll find online are actually just the panels, which can be hooked up to most standard pool pumps. If you plan on installing your solar collectors on your roof, it’s definitely a good idea to consult a solar installation company or roofing professional to get the job done correctly and safely, so it will last a long time.

What solar pool heating products are available? There are many companies that sell solar pool heaters, so we’ve compiled a list of some of the popular options online for comparison:

Buyer’s guide: solar pool heaters

ProductPool typePriceWhat's included?
Fafco Solar Bear Economy Heating SystemAbove ground$339Solar collector, rack, mount
SmartPool S601 Pool Solar HeaterInground$419Solar collector (installation kit sold separately)
SolarPoolSupply Industrial Grade DIY Solar Pool Heating SystemInground$1,777 - $3,582Solar collectors, complete installation kit

Fafco

Fafco offers multiple varieties of solar pool heaters that are suitable for above ground pools. The Solar Bear system listed above is the most expensive of their three offerings, with two smaller options available depending on your pool size.

SmartPool

SmartPool’s solar pool heater system is well rated and an affordable heater for an inground pool. This pool solar heater requires a separate installation kit, however.

Solar Pool Supply

Solar Pool Supply’s DIY home solar pool heating system comes in a range of sizes to fit your needs and pool size. While it has the highest price point, it also comes with a complete installation kit and lifetime warranty.

Other solar pool gadgets

You don’t have to install an entire solar pool heater to benefit from solar power. Here are some other solar-powered gadgets that you can use this summer:

Solar pool pumps

You can use solar energy to power the motor in your pool’s pump, which is the component responsible for pushing water through a filter, cleaning it, and returning it to the pool. There are a number of ways you can do this including powering your existing electric pump with a solar PV system, purchasing and installing a DIY solar pool pump kit, or using a stand-alone solar pool pump that floats directly in your pool and requires no installation.

Buyer’s guide: solar pool pumps

BrandPanelsPrice
PWS Solar Powered Swimming Pool PumpRequired$699 - $899
ECO-WORTHY Solar Pool PumpIncluded$239 - $899

PWS

The PWS pump does not come with solar panels, but can attach to your home solar system. Offering three options depending on your pool size and needs, PWS provides a quick way to add solar energy to your pool.

ECO-WORTHY 

Eco-Worthy’s solar pool pump comes with its own panels, allowing you to set it up without additional items or systems required (aside from a pool, of course). They offer a range of sizes to fit different pool types.

Solar pool covers

If you’re looking for a lower-cost solution to heat your pool, one purchase you may want to make is a solar pool cover. Solar pool covers are more translucent than standard pool covers which allows the sun to warm up your pool while keeping the water clear of debris and animals. Covering your pool, with a solar cover or traditional one, will also help trap the heat and prevent evaporation. The cost of solar pool covers is very dependent upon the size you need to cover the surface area of your pool.

Buyer’s guide: solar pool covers

BrandPool typePrice (size dependent)
Sun2Solar Solar Pool CoverAbove ground & inground$54 - $192
In the Swim Solar Pool CoverAbove ground & inground$110 -  $530
Blue Wave Solar BlanketAbove ground & inground$177 - $280

Sun2Solar

Sun2Solar includes a range of sizes that fit above ground or inground pools at an affordable price point.

In the Swim

In the Swim solar pool covers will trap heat in your pool while allowing additional sunlight to penetrate the cover and further warm your pool.

Blue Wave

Blue Wave solar pool blankets minimize heat loss and trap additional heat to keep your pool at a perfect swimming temperature.

Solar Sun Rings

Similar to solar pool covers, Solar Sun Rings float on the surface of your pool and absorb solar energy to heat the water below. These rings are also useful to prevent evaporation. One of the biggest differences between Solar Sun Rings and pool covers is the shape: Solar Sun Rings are smaller and you’ll likely need multiple of them to cover the surface of your pool. Because they are smaller, they’re easier to remove and can be better suited for uniquely-shaped pools that may not have a perfect shape for a more standard solar pool cover.

Floating solar lights

If you’re looking to light up your pool at night, consider solar floating lights as a solution. Many companies produce colored lights that will absorb solar energy during the day as they float on the surface of the pool and then use that energy come night time to provide lighting.

Buyer’s guide: floating solar lights

BrandPrice
eLEDing Solar Powered Pool Lights$10/light
Intex Solar Powered Floating Light$43/light

eLEDing

eLEDing offers colorful floating pool lights that sit on the surface of your pool. They soak up sunlight during the day to light up your pool for a night swim.

Intex

The Intex solar pool light is a slightly more expensive option, but that price accounts for the multiple light modes and auto on/off feature built into the light.

Other solar accessories


Looking for a different type of solar accessory? You may be interested in one of the products below!

Save money with a solar panel installation

Solar energy is capable of a lot more than just heating up your pool during the summer! The best place to compare options for home solar installations is the EnergySage Marketplace. By registering your property to get solar quotes, you can compare offers side by side from qualified, pre-vetted installers near you and speak with an Energy Advisor to discuss which offer is the best for you. If you’re interested in also exploring your solar pool heating options, simply note it in your account – many PV installers also install solar pool heaters (or can recommend a reputable company to do so).


13 thoughts on “Guide to solar pool heaters: what you need to know

  1. Hardy

    Heating a swimming pool with solar panels can extend your swimming sessions during cold seasons and reduce the expensive cost of heating pools. But, how many solar panels do I need to heat a swimming pool?

    Reply
  2. Hardy

    Great article! Not everyone likes a cold swim, so a cheap way to heat my pool, this way is my best bet. Thanks for your review! I will be able to enjoy it more.

    Reply

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