The Best Solar Pool Heaters For Inground Pools
Looking for the best solar pool heaters for inground pools?
Solar heating units rely on the free solar energy to warm pools; therefore, you do not have to worry about hefty energy bills due to a gas or electric heater. What’s more, solar heaters are eco-friendly.
There are different types of solar heaters for inground pools in the market, so choosing the best one can be overwhelming. For this reason, we’ve put together some of the best solar inground pool heaters for a thrilling swimming experience.
Let’s get started!
SmartPool s601p Sunheater Solar Panel Heating System
- Keep your pool warm with a polypropylene heat collector. Direct Flow System - One Header Hole...
- Solar heater features 80 square feet of solar panels
- Pool accessory is perfect for heating any in-ground swimming pool
The Smartpool s601p Sunheater is among the best choices for heating your inground pool since it increases the temperature by 6 to 10 degrees. But of course, the temperature can go higher than 10 degrees depending on your location and the amount of sun the heater gets each day.
This heating unit uses 80 square feet of panels, and each panel is 4 feet wide by 20 feet long. The solar panels are made from polypropylene and have a fiberglass coating over the molded header, making them durable and long-lasting.
The heater comes with a separate installation kit, four rubber connectors, and hose clamps that come in handy when mounting it on the roof.
However, the installation process can be challenging, but you will be fine when you follow the easy-to-understand detailed instruction manual. So keep your pool warm with this polypropylene heat collector characterized by a direct flow system with one header hole for each heating tube.
- Fiberglass coated heater
- Raises temperature by 6-100 F (4-6°C)
- Large-sized solar panels for maximum heat absorption
- Exceptional durability
- Compatible with inground and above ground swimming pools
- Difficult to install
Sun2Solar Blue Solar Cover
- ATTRACTIVE BLUE DESIGN - Sun2Solar solar blankets are made from a film of thousands of tiny...
- MINIMIZE WATER EVAPORATION - The use of a solar cover helps in preventing up to 95% of pool...
- JUMP INTO WARMTH - Show friends and family your bravery by jumping in without the standard toe...
The Sun2Solar blue cover provides an attractive way to keep your pool warm. This solar pool blanket is made from a film of thousands of tiny bubbles, which work together to collect and retain heat at night and on those chilly days. The blue color gives it an appealing look. It uses the sun’s rays to help warm your swimming pool.
Tired of constantly filling up your pool? Purchase the Sun2solar cover. Using this solar cover prevents up to 95% of pool water evaporation. So when you are not engaging in a luxurious swim, you can cover it with this amazing Sun2solar blue solar cover and reduce the vast amount of pool water lost into the environment.
When the sun goes down, the blue solar cover will work perfectly to keep your pool warm. In addition, it can prevent the loss of up to 10 degrees heat overnight; therefore, you do not have to worry about losing all of that warmth generated throughout the day.
The solar2solar blue solar cover is designed to fit all types of pool shapes. Using a marker and a pair of scissors, you can trim this solar cover to suit your uniquely shaped pool. All you have to do is trace a line on the cover with the bubbles facing down toward the water and chop off the extra material. Trimming will not affect your manufacturer’s warranty.
- Easy to size to your pool
- Minimizes water evaporation
- Simple to use
- Clean and warm pool
- Not durable
SunHeater Pool Heating System Two 2’ x 20’ Panels
- SOLAR POOL HEATER – The SunHeater Solar Pool Heating System allows you to capture free heat...
- EXTENDS POOL SEASON – Your pool’s pump pushes the water through the panel’s many tubes...
- EASY TO INSTALL – This pool solar heater uses your existing filtration system and has 4 end...
The SunHeater heating unit provides you with an efficient and cost-effective method to heat your pool. It has a tube-on web design that helps to capture as much sun as possible, maximizing square footage. In addition, this tube -web-tube offers rigid flexibility, allowing panels to expand and contract with the pool changing temperature, giving it the strength needed to last.
The Sunheater heating panels raise your pool temperature 6-10 degrees F and can extend your pool season by weeks. The pool pump pushes water through the Sunheater panels, where it is warmed by the sun and then returned into the swimming pool.
This solar pool heater is quite easy to install; therefore, you do not need to waste time and money to hire a professional to help you with the installation process. Instead, you can do it yourself.
The Sunheater pool heating unit uses your existing filtration system and has four end caps, two elbows for flex hose connection, six stainless steel hose clamps, one roll of Teflon tape, and a rubber connector hoses. It also includes two 2’ x 20’ panels made of durable polypropylene and is a universal system that works for pools up to 31’ around or 18’ x 36’.
- Easy to Install
- Ideal for both inground and above the ground swimming pools
- Exceeds expectations on increasing water temperature
- It doesn’t get brittle in intense sun
- Includes ample installation supplies (mounting kit)
- Possible leaks
GAME 72000-BB PRO Curve Solar Heater
- SOLAR POOL HEATER: The GAME SolarPRO Curve Solar Pool Heater has been designed for above-ground...
- DURABLE CONSTRUCTION: We’ve designed this above-ground solar pool heater with high-quality...
- UNIQUE CURVED SHAPE: The GAME solar pool heater has been engineered with a unique curved shape...
Game Solarpro curve solar pool heater is your solution to heating your pool all seasons round. Although the heater is mostly designed for an above-ground pool, it will perfectly get the job done on your inground swimming pool. You can be sure of a 5-degree increase in your pool water temperature within four days upon installation for an 8000-gallon pool.
Worried about its durability? You can relax because this heating unit is made of high-quality materials that hold up against frequent exposure to the sun and any outdoor elements, guaranteeing a long lifespan.
The game Solarpro curve solar pool heater further has a unique curved shape that helps to maximize heat collection. In addition, to allow for versatile plumbing options, this heating unit has threaded ports.
The heaters are compatible with Intex, Bestway, and most above and inground pools. Now to ensure that the heater is set for maximum exposure to the sun on these pools, it has adjustable and foldable legs, along with a clear cover to lock in heat. If you are looking to use more than one solar pool heater, you need a bypass kit to connect multiple units.
The game Solarpro is the perfect gradual heater that will raise your pool water temperature and extend your pool season with a space-saving footprint. What’s more, this solar heating device is new and improved and has adapters for 32mm, 38mm, and 40mm hoses which work with most Intex and Bestway pools, as well as extra parts for easy replacement.
- Adjustable legs
- Durable construction
- Unique curved shape
- New and Improved
- Compatible with Intex, Bestway, and most above and inground pools
- Highly efficient solar panels to gather optimum energy
- Good direct flow
- Short hoses
- Best suited for above-ground pools
SunHeater S120U Universal Solar Pool Heater
- Simple DIY installation; for in ground or above ground pools
- Installs on roof, rack, ground or fence
- Patented web design for maximum exposure to sun's rays
The sun heater S120U universal solar pool heater provides you with a cost-effective way to warm your pool. This is because it uses a simple do-it-yourself installation and uses your existing ground swimming pool pump to heat your pool.
Sunheater S120U has a patented web design that allows maximum exposure to sun rays, therefore, capturing free heat to raise your pool water temperatures 6 to 10 degrees F.
This universal solar pool heater has diverse mounting options; therefore, you can place it on the roof rack, the ground, or even on the fence.
It is made in the USA, uses a manual power source, and is 120 x 27.5 x 16 inches. This solar heater is designed for the above-ground swimming pool and the in-ground swimming pool and can add weeks to your pool’s season.
- Easy to install
- Diverse mounting locations
- Web design for maximum exposure to the sun
- Compatible with existing pumps
- Increase water temperature 6-10 degrees F
- Not durable
- Low-quality material
FlowXtreme NS1002 Flat-Panel Pool Solar Heater
- State-of-the-art - an innovative, flat-panel structure lowers the amount of time it takes to...
- Easy to install - standard, 1.25 - 1.5-in fittings provide compatibility with most above ground...
- POWERED BY SUNLIGHT - The FlowXtreme Solar Dome Heater uses nature's most powerful source of...
The FlowXtreme solar heater allows you to enjoy the blissful warmth of your swimming pool. It has a flat panel design that increases your pool’s heating capacity by 40% per cycle through capturing and magnifying sunlight. Therefore, it can increase your pools season by weeks.
This heating unit is easy to install because it has built-in legs that make it easy to adjust. It easily connects with standard, 1.25 – 1.5-in attachments; therefore, it is compatible with above-ground and inground pools. All you have to do is attach it to your existing pump and filter, and it will instantly start warming your pool.
FlowXtreme solar heating device comes with adjustable legs, an adapter, two installation hoses, and a one-year manufacturer’s warranty.
- Easy to install
- Attaches to existing filters and pump system
- Increases pool temperature by 40% per cycle
- Ideal for any size pool
- Collapsible legs for adjustment ease
- Extends pool season by weeks
- Possible leaks
Beluga Pool Solutions 1652 Solar Heating Device for Swimming Pool
- Heat your pool with a garden hose. Save hundreds on your energy bill
- Increase the comfort and extend the swimming season of your pool.Economical alternative to gas...
- Easily connects to a standard 1 1/2" return fitting
Who said solar panels are the only way to heat your pool using the sun? The beluga solar pool device provides you with a revolutionary alternative to heat your ground pools using a garden hose.
The solar heating device connects to a standard 1 1/2″ return fitting on your pool, allowing you to divert a small stream of pool water into the garden hose. The device further slows down the hose’s water, capturing the maximum heat the garden hose can produce, therefore raising your pool water temperature.
This solar heating device can be used on both the above the ground and inground swimming pools. With it, you can now get your pool up to temperature sooner, extend your pool season, recover from cold rain or a cool evening without any additional costs; no expensive heater unit, no service bills, and no expensive energy bills.
The beluga heating device is the best economical alternative for gas or electric pool heating.
- Compatible to above ground and inground pools
- Increase the comfort and extend the swimming season of your pool
- Economical alternative to gas or electric heating
- Ease in installation
- .Suitable for small pools only
- A short lifespan( made of plastic which does not hold up, therefore, not durable)
SSR SSRA-100 Solar Sun Rings Pool Water Heater
- Solar Sun Rings are passive solar swimming pool heating devices, constructed from two layers of...
- The upper clear layer directs the suns rays onto the bottom blue layer which absorbs about half...
- The remaining sunlight filters through the ring into your pool water
If you are working under a tight budget and looking for an inexpensive way to warm your pool using solar energy, you should definitely consider purchasing the SSR SSRA-100 Solar Sun rings pool water heater. Solar Sun Rings are made from two layers of UV-resistant vinyl, which passively heat your pool.
The two layers perform different functions, with the upper clear layer directing rays from the sun to the bottom layer, which converts them into heat. Next, the rings filter the residue sunlight into your pool water.
However, ensure that you do not overinflate or use them as a flotation device. Solar Sun Rings are warranted to clear manufacturing defects for two years and are limited to materials and artistry.
- It warms the pool quite quickly
- Do not blow away easily
- Reduce evaporation
- Ideal for above the ground and inground pools
- Easy to install
- Trap dirt and leaves (may stop the skimmer from working properly)
- Not suitable for large pools
SolarPoolSupply Industrial Grade DIY Solar Pool Heater System
- TOP-OF-THE-LINE MANUFACTURING: The unique square header shape maximizes flow and increases...
- LEADING ATTACHMENT METHOD: Features an innovative clamping system with a proven record of being...
- SPECIALIZED STRAPLESS MOUNTING: Superior mounting method allows for strapless flush mounting to...
Your pool heating plan does not get any better than a 12-year full, lifetime limited warranty that includes freeze protection, SolarPoolSupply pool heater. This heater has the longest, most comprehensive warranty coverage in the industry.
The SolarPoolSupply heating unit is durable because it is manufactured using a patented ever-molding process that involves molding together headers and riser tubes to form one solid piece while eliminating seams and welds that crack with age. The molding process produces the strongest possible connection and ensures a low maintenance system.
The DIY solar heater has low head-loss riser tubes, which help in maximizing efficiency and protecting against clogging. In addition, the unique square header shape maximizes flow and increases efficiency.
These solar heaters have a specialized clamping system that connects panels to PVC piping. It further allows panels to be mounted closer together for a more efficient and attractive system while eliminating the need for troubling rubber hoses and metal clamps that require regular rooftop maintenance and replacement.
This DIY solar heater allows for the strapless flush mounting to any roof type, standard expansion, and contractions as the panels heat the pool and minimizes roof penetration. This is because it has a specialized design and superior mounting method.
Its mounting pad system further allows for greater flexibility of mounting locations when installing panels on a tile roof.
Thanks to its mounting system that minimizes roof connections, the SolarPoolSupply heater has a roof-friendly system. Each tube design prevents the accumulation of moisture while eliminating wind loads, therefore, allowing the roof to breathe. In addition, this design allows the panels to withstand much stronger storm winds without the need for tie-down strapping. Installations are simple, sleek, and aesthetically pleasing.
- An impressive 12-year full warranty
- Industrial-grade durability
- Specialized clamping system
- Roof-friendly installation
- Strapless flush mounting
- Super expensive
Fafco Solar Powered Heating System
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Fafco Solar is your go-to heating system for your swimming pool. Thanks to its diverse mounting options, you can place it anywhere, whether on a rooftop, on a rack, or simply lay it on the ground.
The pool solar panel comes with a tilted system to increase its effectiveness. For instance, when you tilt it 10 to 30 degrees towards the South, it receives more sunlight. As a result, it heats your pool much faster. For best results, tilt the solar between 10 A.M. to 4 P.M. when there is good sunlight.
Fafco solar heating unit is 20 feet long and 2 feet wide. It is easy to set up due to the lack of connectors. In addition, the Solar panels are made of UV-resistant materials; therefore, the heating system is durable and eco-friendly.
What’s more? The Fafco solar system is made by a reputable company and comes with a 10-year warranty; therefore, you are sure to purchase a quality product and get the full value for your money.
- Made with UV-resistant materials and is ecofriendly
- Durable and long-lasting
- Easy installation due to the lack of connectors
- Impressive 10-year warranty!
- Green pool heating system
- Leaks as it is mostly designed for above ground swimming pools
SunQuest 2-2’X12′ Solar Pool Heater
- SOLAR POOL HEATER: SunQuest pool heating system is easy to install and works with your existing...
- SOLAR POOL HEATER: SunQuest pool heating system is easy to install and works with your existing...
- EFFICIENT HEAT DESIGN: Our solar pool heater for inground pools and above ground pools features...
If you enjoy evening swims, then you should definitely consider purchasing the Sunquest solar panels. These Solar pool panels will raise your pool water temperature by up to 10 degrees and keep working from early spring through the late fall. So you can be sure to keep enjoying your swims in luxurious warm water.
SunQuest Solar panels are compatible with your existing pool pumps; therefore, you do not have to purchase new ones to facilitate better circulation and less backpressure. What’s more? This solar panel heating system is ideal for above the ground and inground pools.
SunQuest’s high-performance pool solar heating systems can be installed in just 30 minutes. They are also quite easy to install. You do not have to hire a professional to install them for you. Instead, you can do it yourself.
These energy-efficient solar panels are simply unsurpassed in value as they collect maximum solar energy, which can be used as a pool cover. The panels come with standard connectors attaching 1-1/2″ & 1-1/4″ flexible hose.
- Easy to Install
- Efficient solar panels
- Unique design
- Raise pool water temperature to 10 degrees
- Maximum water flow through a check valve
- No warranty
- Require direct sunlight
XtremepowerUS 90100-V 28″ X 20′ ft Solar Pool Heater
- XtremepowerUS Panels are built from extremely high-grade materials that are proven to last in...
- Pools pump and filter system circulates pool water through the SOLAR PANELS when it is heated &...
- System is designed to be used on above-ground or in-ground pools. Each kit is made of - 2' x...
If you are looking for a cost-effective way to heat your pool, purchasing Xtremepower US 90100 is the way to go. This because this solar pool heater is made of polypropylene material which is durable and can last in all types of weather. Its panels also require low maintenance.
When the existing pool pumps and filter system circulate pool water through the Xtremepower heating solar panels, it is heated and returned to your pool. Therefore, the Xtreme power solar panels do not produce greenhouse gases once they are installed.
This power system is ideal for use in an inground pool or above the ground pool. What’s more? This heating system is durable as it is made of lightweight polypropylene – 2′ x 20’ft panels in each kit. The systems panel tubes create a large surface area to optimize heat transfer from the sun to the pool.
Wondering about the number of Xtremepower solar panels you need for your swimming pools? Well, the quantity of these panels needed for your home is dependent on the size of your pool and location. In addition, a diverter kit, which is sold separately under each item number, is necessary for pumps 1.5hp and greater.
- Easy installation
- Simple to roll up and store
- Ideal heater for above ground and inground pools
- Low maintenance
- It does not produce greenhouse gases
- Increases water temperature by 10 to 15 degrees in a short amount of time
- Require more than one system if your pool measures 80 square feet and above
- May require a diverter kit
- May not fare well in extreme climates
Buyer’s Guide to the Best Solar Pool Heater for Your Inground Pool
The solar pool heaters market is flooded with so many heating systems. This may get in your way of getting the best solar pool heater for your pool, necessitating a buyer’s guide. Here is a complete guide on what you ought to consider when buying a solar pool heater for your home.
1. The Size of Your Pool
The way your solar pool heater operates depends on the size and shape of your swimming pool. Therefore before going on a solar pool heater hunt, ensure that you keep these details in mind.
It is essential to remember that some solar-powered pool heaters will work well for high volumes of pool water, while others are better for small pools with limited water flow. So you need to ensure that the solar pool heater you intend to buy suits the volume of your pool.
2. The Space For Your Solar Pool Heaters
Where will you place your swimming pool solar panel? The amount of space you have determines the number of solar panels you should purchase.
Therefore, find an ideal open area on your compound; it could be on the roof, the rack, or the ground, and measure it to ensure you have enough space for all the panels you may need.
In addition to that, you should consider the available type of space. If, for instance, your space is long but narrow, 2 feet by 10 feet panels should fit perfectly.
3. The Function of Your Swimming Pool
Your pool functionality contributes a great deal to the choice of your solar pool heater. If, on the one hand, you use your pool for recreational purposes, then you should consider a solar-powered pool heater that gives the right temperatures for this purpose.
And if, on the other hand, you are an athlete and use your pool for training, then you should consider a more top-of-the-range solar pool heater with reliable temperature readings.
4. The Solar Resource
You should always keep in mind the amount of energy your pool site receives before purchasing solar pool heaters. A solar heating system will rely on direct solar heating and diffuse solar radiation to crank temperatures. So, the more sunlight, the more heat.
Now estimating the amount of sun your pool receives can be challenging, which is why you need your contractor to consult a site analysis. This will help develop reliable estimates and, in turn, purchase the best solar pool heater.
5. The Pool Type
There are different types of swimming pools, including the above-the-ground pools and the inground pools. In the same way, different solar pool heaters are designed for different pool types. So you must keep your pool type in mind to avoid spending more time and money on changing your solar pool heater to suit your pool.
For your case, ensure that the heating system you purchase is designed for inground pools.
6. Your Pool Temperature Needs
It is no secret that some solar-powered pool heaters are significantly stronger than others. Solar pool heating systems are designed for use in areas where the sun is hot, such as Florida, while others are suitable for cooler climates.
Now, this attribute determines your pool temperature needs. Therefore, when purchasing a solar heating system, ensure that its build helps you achieve your desired temperature factors.
For instance, if you just need a little boost in warmth to hit that 82 degrees, you don’t need hardier systems that produce more heat.
A solar pool heating system is an expensive investment. For this reason, you should ensure that you purchase a quality solar pool heater, one that is durable.
Therefore, on your hunt, make sure you go for solar pool heaters with glass coating as they will last longer, saving you the hassle of having to replace them every once in a while.
8. Ease of Installation
Purchasing a solar pool heating system is not enough. You further need to install it in your swimming pool. Therefore, before choosing the solar pool heaters for your home, consider their complexity in installing.
If you are a do-it-yourself kind of person, you should opt for a solar pool heater that is easy to install. Alternatively, you could hire a contractor to work on the installation process on your behalf. You just have to factor in your set budget before going ahead to hire a professional.
9. The Brand
Where will you purchase your solar pool heating system? You must opt for a trusted dealer for the best solar pool heaters. But how you choose the best supplier for your solar heating system?
For this, you could consider visiting a supplier’s website and going through the reviews and testimonials from people who have received their services before. This will help gauge the quality of their services.
Alternatively, you could seek recommendations to the best solar pool heaters suppliers from people who have purchased a solar heating system before.
10. Solar Pool Heaters Cost
Of course, price is crucial when purchasing a solar pool heating system. You want to stay within your budget and maybe save as much as you can.
However, it is essential to know that the best quality solar pool heaters are the most expensive. So do not just opt for the cheapest solar panel heating system available in the market.
You should further include the installation costs in your budget to come up with reasonable approximations.
A swimming pool solar heating system is an expensive investment. So you should ensure that you opt for solar panels that come with a warranty.
Every company has a different type and length of warranty. For example, Fafco powered heating systems have an impressive 10 years warranty, assuring you will have a quality pool heater for a decade.
While not everyone needs an extended-year warranty, it’s always important to consider it when choosing which solar polar heater to buy.
Frequently Asked Questions
1. What is the best solar heating system for pools?
SmartPool s601p Sunheater Solar Panel Heating System is the best inground solar heater. It is made of durable material, hence a longer lifespan, and has a fiberglass coating. It can raise your pool temperature by 6-100 F (4-6°C)
SmartPool s601p Sunheater has large-sized solar panels for maximum heat absorption.
2. Is solar pool heating worth it?
Yes. Installing a solar pool heater helps you to reduce pool heating costs significantly. This is because they rely on free energy from the sun to heat your pool, which makes them have a meager annual operating cost. Solar heaters are the most cost-efficient pool heating units compared to electric and gas heaters.
3. How many solar panels does it take to heat a pool?
There is no exact number of solar panels recommended for a particular pool. Why? Because the square footage of your pool determines the number of solar panels you need to heat your pool.
Suppose the total surface area of your pool is 800 square feet; you need a 50% offset. This implies that you need 400 square feet of solar panels to heat it effectively.
4. How do you heat an inground pool with solar panels?
A solar heating unit has four components, a solar panel, a pump, a valve, and a filter. Therefore, when you successfully install the pool, the filter first removes debris and dirt particles from the water. The pump then leads the water through the solar collectors, where the energy from the sun heats it. Finally, once the water has been warmed up, it is pumped back into the pool.
5. Does a pool heat up faster with the solar cover on?
Yes. A solar cover does more than prevent debris from entering your pool. It further locks the warmth of your heated water in, therefore speeding up the heating process. So, ensure that you purchase a pool cover along with your solar panels. Remember to keep your pool shape in mind as you buy solar covers for the best results.
6. How long does a pool take to heat?
The exact solar heating time for your pool is dependent on the strength and quality of your heaters. That said, most solar pool heaters heat pools within 8 to 12 hours.
It is worth noting that heat from the sun may not get your pool water to your desired temperatures. So you should consider using a solar cover to trap more heat, increase the pool temperature and keep the warmth for a longer period.
7. Do solar pool heaters work in the winter?
Solr heaters rely on direct sunlight to heat the pool. Therefore, during winter, when the weather is cold, solar heating is less effective. In fact, a solar heater may end up making the water cold during winter.
However, solar panels can heat your pool to the desired temperature within 12 hours when there is consistent sunlight.
8. Do pool solar panels ruin your roof?
No. Solar panels cannot damage your roof. Instead, they work perfectly to protect your roofs from excessive sunlight as they sit on top and absorb the sun. However, this can only be achieved when the solar panels are installed appropriately.
9. Where should a solar pool heater be installed?
Different solar polar pool heaters come with diverse mounting options. Some solar heaters can be installed on the roof, others on the rack, ground, or fence. Therefore, check with the manufacturer’s instructions on an ideal location to install your solar pool heater.
10. When should I turn on my solar pool heater?
Solar pool heaters rely on direct sunlight to heat the swimming area. Therefore the ideal time to run your panels is during the sunniest time of the day. For the best results, turn on the solar heater when the sun is directly hitting your panels and not just when the sun is out.
11. What temperature should I heat my pool to?
The temperature to which you should heat your ground solar pool is a personal preference. That said, most swimmers prefer a temperature between 78°F and 82°F (26°C and 28°C). But, of course, the temperature can go higher or lower depending on your location and the climate. For instance, during sweltering summer, the temperatures could go a little cooler.
12. What is the most comfortable pool temperature?
There is no standard pool temperature range. This is because different people have different temperature needs. During summers, the majority of adults are more comfortable with a temperature range between 78°F and 82°F (26°C and 28°C). For pools used for athletics or physical therapy, a higher temperature of around 86°F is preferred.
13. Are Solar Pool Heaters Water-Resistant?
The simplest answer is YES. Solar pool heaters can comfortably be exposed to water on their external surface without any damage. This is because they lack an electric component that could be damaged by contact with water. In addition, the fact that they are installed on roofs, racks, and others on the ground where they are exposed to direct rainfall proves their water resistance.
If you notice any leakage connected with the heater, this can only mean physical damage that needs to be repaired. It has nothing to do with the heater’s resistance to water.
However, be wary about your pool’s water pressure. To avoid damaging your heater, stick to the limited horsepower recommended by the heater’s manufacturer for the pool pump.