Extending your swimming season is one of the best investments you can make for your backyard oasis. A reliable pool heater turns a chilly dip into a warm, inviting experience, allowing you to enjoy your above-ground pool from early spring right through to late autumn. With the right heater, you can maximize your pool’s usability and create more opportunities for family fun and relaxation.
Choosing the perfect heater, however, depends on several factors including your pool’s size, your local climate, and your preferred energy source. From rapid-heating gas models to energy-efficient heat pumps and cost-effective solar options, this roundup covers the top performers to help you make an informed decision for your home.
The Best Pool Heaters for Your Above-Ground Pool
- Pentair EC462025 MasterTemp 125 125,000 BTU Compact Heater
- FibroPool Swimming Pool Heat Pump – FH270 70,000 BTU
- Raypak 266,000 BTU Digital Electronic Ignition Natural Gas Pool Heater
- Hayward W3H135FDN H-Series Pool/Spa Heater, 135k BTU
- West Coast Parts WCP Genuine OEM Vertical Frame Leg
- SunHeater Pool Heating System Two 2’ x 20’ Panels
- Aquastrong Inverter Swimming Pool Heat Pump, 55,000 BTU
- FibroPool Swimming Pool Heat Pump – FH135 35,000 BTU
- GAME 4721-BB SolarPRO Curve Solar Pool Heater
- Intex Solar Pool Heater Mat
Pentair EC462025 MasterTemp 125 125,000 BTU Compact Heater
For pool owners seeking powerful and rapid heating, the Pentair MasterTemp is a top-tier propane gas option. Its 125,000 BTU output is engineered for smaller pools up to 15,000 gallons, delivering quick warmth so you can spend less time waiting and more time swimming. The compact design makes it an excellent choice for spaces where footprint is a consideration.
Modern features set this heater apart. It offers smart connectivity with Pentair Automation Systems, allowing you to manage your pool’s temperature and functions remotely from your smartphone. The full-text digital display provides a user-friendly interface for easy operation and diagnostics, while the advanced ignition control module ensures reliable and efficient performance every time you turn it on.
FibroPool Swimming Pool Heat Pump – FH270 70,000 BTU
The FibroPool FH270 is a high-efficiency, all-electric heat pump that provides an eco-friendly alternative to gas heaters. By transferring heat from the surrounding air into your pool water, it operates without natural gas or propane, which can lead to significant savings on operating costs over time. This model is built for above-ground pools up to 27 feet round.
Designed for optimal performance, this heat pump utilizes a titanium heat exchanger and high-pressure differential compressors to achieve remarkable energy efficiency. It performs best in humid climates where the ambient temperature remains above 50 degrees Fahrenheit. This makes it a superb choice for consistently warming your pool during the spring and fall seasons in suitable climates.
Raypak 266,000 BTU Digital Electronic Ignition Natural Gas Pool Heater
When you need serious heating power for a larger above-ground pool, the Raypak digital natural gas heater delivers with a substantial 266,000 BTU capacity. Its rugged construction is built to endure various weather conditions, providing a reliable heating solution year after year. This model prioritizes both efficiency and convenience for the user.
This heater incorporates an intermittent spark ignition system, which means the pilot light only activates when there is a call for heat, conserving energy. Furthermore, its advanced materials prevent it from retaining residual heat after shutdown, enhancing safety and allowing for easier installation near other equipment without the need for expensive heat sinks.
Hayward W3H135FDN H-Series Pool/Spa Heater, 135k BTU
Hayward’s H-Series natural gas heater is engineered for performance and durability. With a 135,000 BTU output, it offers a strong balance of power and efficiency for many above-ground pools. Its industry-leading hydraulic design provides faster speed-to-heat capability, meaning you can achieve your desired water temperature quickly.
At the heart of this heater is a durable cupro-nickel heat exchanger, known for its corrosion resistance and long service life. The unit is controlled by an intuitive and easy-to-operate electronic panel, simplifying the process of setting and adjusting your pool’s temperature. It’s a solid, dependable choice from a trusted brand in pool equipment.
West Coast Parts WCP Genuine OEM Vertical Frame Leg
Please note that this product is a replacement part for a specific Coleman Power Steel pool model and not a functional pool heater. It is a genuine OEM vertical frame leg designed for 18ft x 48in and 20ft x 48in metal frame pools.
This part is essential for maintaining the structural integrity of your above-ground pool but does not contribute to heating the water. It is compatible with the Coleman 90458E Power Steel Metal Frame Round Pool with Metal T-Joints.
SunHeater Pool Heating System Two 2’ x 20’ Panels
The SunHeater system offers a cost-effective and eco-friendly way to warm your pool by harnessing the power of the sun. This kit includes two durable polypropylene panels that work with your existing pool pump to circulate water, where it is naturally warmed before returning to the pool. It’s an excellent method for free heating after the initial investment.
Designed specifically for above-ground pools up to 24 feet round, this system can raise your water temperature by 6 to 10 degrees Fahrenheit. By effectively extending your swim season without adding to your energy bill, the SunHeater is a practical solution for making the most of sunny days.
Aquastrong Inverter Swimming Pool Heat Pump, 55,000 BTU
The Aquastrong Inverter heat pump is a versatile and smart choice for modern pool owners. It features a dual-mode system that can both heat your pool for those cooler days and cool it during the peak of summer, maintaining optimal water temperatures year-round. With a capacity for pools up to 16,000 gallons, it delivers 55,000 BTU of efficient warmth.
Its standout feature is the advanced inverter technology, which includes full DC variable frequency for a remarkable COP of 15.8. This intelligent system dynamically adjusts power in real-time, achieving up to 70% energy savings compared to traditional electric heaters. You can control everything via a user-friendly app or the control panel, allowing for remote temperature adjustments and scheduling.
FibroPool Swimming Pool Heat Pump – FH135 35,000 BTU
For smaller above-ground pools, the FibroPool FH135 provides an efficient and clean electric heating solution. With a 35,000 BTU output, it is well-suited for pools up to 18 feet round. Like its larger sibling, it operates by moving heat from the air into the water, eliminating the need for natural gas or propane and reducing both environmental impact and fuel costs.
This model shares the same high-efficiency engineering, utilizing a titanium heat exchanger and high-pressure differential compressors. It is designed to perform reliably in humid climates where temperatures stay above 50 degrees Fahrenheit, offering a low-maintenance way to enjoy a comfortably warm pool during the shoulder seasons.
GAME 4721-BB SolarPRO Curve Solar Pool Heater
The GAME SolarPRO Curve is a uniquely designed solar heater that fits perfectly with many above-ground pools, including popular Intex and Bestway models. Its curved shape is not just for aesthetics; it is engineered to maximize surface area and heat collection from the sun. The kit comes complete with necessary adapters, hoses, and clamps for a straightforward setup.
Constructed from high-quality, UV-resistant materials, this heater is built to withstand constant exposure to the elements. It can gradually increase your pool’s temperature by about 5 degrees over several days, providing a simple and effective way to gain more warmth from sunny weather without any operating cost.
Intex Solar Pool Heater Mat
The Intex Solar Pool Heater Mat is a simple and affordable solar heating solution designed to work seamlessly with Intex pool systems. This mat functions by laying it in a sunny location and connecting it to your pool’s filtration system, allowing water to pass through and be warmed by the sun’s rays before flowing back into the pool.
As a passive heating system, it adds no cost to your electricity bill and requires very little maintenance. It’s an ideal entry-level option for Intex pool owners looking to take the chill off the water and slightly extend their swimming season using renewable solar energy.
Buying Guide: How to Choose the Right Pool Heater
Choosing the right heater for your above ground pool isn’t just about picking the most powerful or the cheapest one. It’s about finding the perfect match for your specific setup, climate, and budget. I’ve found that getting this decision right makes all the difference between a pool season that’s just okay and one that’s absolutely fantastic. Let’s break down the main things you need to think about.
First up is the type of heater. You have three main options: gas, heat pump, and solar. Gas heaters, which run on propane or natural gas, are my go-to for fast heating. If you want to warm the pool up quickly for a weekend swim, this is your best bet. They work well in all climates but can be more expensive to operate. Heat pumps are the energy-efficient long-haul option. They pull heat from the surrounding air, so they work best in areas with long, warm swimming seasons. They heat the water slower but cost less to run day-to-day. Solar heaters are the most cost-effective to operate, using free energy from the sun, but they obviously depend on sunny weather and require a significant initial setup.
Next, you absolutely must get the sizing right. This is the most common mistake I see. A heater that’s too small will struggle to heat your pool and run up your energy bill for no reason. A heater that’s too large is an unnecessary upfront expense. Size is measured in BTUs (British Thermal Units) for gas heaters and horsepower (HP) or specific BTU ratings for heat pumps. To find the right size, you need to know your pool’s gallon volume. As a very rough rule of thumb, for a gas heater, you’ll often see recommendations around 50,000 to 150,000 BTUs for a typical above ground pool. For a heat pump, a 50,000 to 80,000 BTU model is common. Always consult a professional or use a detailed sizing calculator that factors in your pool’s size, your desired temperature rise, and your local climate.
Finally, consider your budget and operational costs. The initial purchase price is just one part of the equation. Think about the long-term fuel costs. Gas heaters are cheaper to buy but more expensive to run. Heat pumps have a higher purchase price but lower operating costs. Solar has high installation costs but virtually no ongoing expenses. Also, look at the features. Digital control panels make it easy to set your perfect temperature. I also recommend looking for models with good corrosion resistance, especially for above ground pools where the equipment is closer to the ground, and safety features like automatic shut-off.
Taking the time to weigh these factors—heater type, correct sizing, and total cost of ownership—will lead you to one of the 10 best pool heaters for above ground pools that truly fits your life.
Frequently Asked Questions
What is the most cost-effective type of pool heater to run?
For the lowest ongoing operating costs, a solar pool heater is the winner. Once it’s installed, it uses free energy from the sun, so your cost to heat the pool is practically zero. The big caveat is the high initial investment for the panels and installation, and its performance is entirely dependent on getting enough sunlight. If solar isn’t practical for you, a heat pump is the next most cost-effective option. It uses electricity to move heat from the air, which is much more efficient than generating heat directly, leading to lower monthly bills than a gas heater.
How long does it typically take to heat an above ground pool?
This depends heavily on the heater type, the size of your pool, and the starting temperature. A powerful gas heater is the speed demon here. It can raise the temperature of an average-sized above ground pool by 20-30 degrees Fahrenheit in just a few hours. A heat pump is much slower; it might take a day or two of continuous running to achieve the same temperature rise. Solar systems are the slowest, as they rely on cumulative sun exposure over several days. For a quicker warm-up, I always recommend using a solar cover to trap the heat in at night.
Can I install a pool heater myself?
While some handy homeowners might be tempted, I strongly advise against a DIY installation for most types of pool heaters. Gas heaters involve working with gas lines, which requires a licensed professional for safety and code compliance. Heat pumps and solar systems involve complex plumbing and electrical work. An improper installation can not only void your warranty but also create serious safety hazards and lead to inefficient operation or damage to the equipment. Hiring a certified installer is the safest and most reliable path.
Do I need to run my pool heater all the time?
No, you don’t need to run it constantly. Once your pool water reaches your desired temperature, the heater will cycle on and off to maintain it. Many modern heaters have digital thermostats for this exact purpose. To save on energy costs, some people choose to turn the heater down or off when the pool won’t be used for a day or two. However, if you let the pool get cold, it will cost more to reheat it from a lower temperature than to maintain a consistent one. Using a solar cover is the single best thing you can do to retain heat and reduce how often the heater needs to kick on.
What size heater do I need for my 15,000-gallon above ground pool?
For a 15,000-gallon pool, you’re looking at a medium-sized heater. A gas heater in the range of 75,000 to 125,000 BTUs would be a common and effective choice, providing a good balance of heating speed and efficiency. If you’re in a climate suited for a heat pump, a model rated around 50,000 to 65,000 BTUs would likely be sufficient. This is a general guideline, and your specific needs can vary. The best way to find the perfect model from the 10 best pool heaters for above ground pools is to consult the manufacturer’s sizing charts or speak with a pool professional who can account for your local weather conditions and swimming habits.