How To Choose a Pool Heater Plus the 9 Best Models for Efficient Heating and Energy Savings

Swimming pool heaters keep water warm and comfortable, making it easier to enjoy your pool year-round with family and friends. There are several types of pool heaters available, including natural gas, propane, electric, and solar-powered units. While all can effectively raise water temperature, some also offer smart controls or energy-saving features for added convenience. 

To help you choose the right option, we spoke with a pool care expert and reviewed dozens of popular models, comparing ease of installation, heat output, and compatibility with various pools and water features. Our top pick is the Hayward W3H200FDN 200K BTU Universal Gas Heater for its fast heat-up time and reliable, energy-efficient performance. Read on to learn more about all the options that made our list and to see which features matter most when selecting from among the best pool heaters for your needs.

1. BEST OVERALL: Hayward W3H200FDN 200K BTU Universal Gas Heater
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2. BEST BANG FOR THE BUCK: FibroPool FH255 55K BTU 240-Volt Pool Heat Pump
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3. BEST ABOVE-GROUND: Varpoolfaye 16K BTU Above-Ground Pool Heat Pump
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4. BEST INGROUND: Hayward W3H250FDP 250K BTU Universal Propane Heater
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5. BEST ELECTRIC: Dr. Infrared Heater 110K BTU DC Inverter Heat Pump
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6. BEST PROPANE: Hayward W3H150FDP 150K BTU Propane Heater 
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7. BEST GAS: Lochinvar EnergyRite 400K BTU Natural Gas Pool Heater
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8. BEST SOLAR: SunHeater Smart Pool S601P Solar Heating System
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9. BEST SALTWATER: Hayward W3H400FDN 400K BTU Natural Gas Pool Heater
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Pool Heaters Comparison

Our Top Picks

We selected the following products based on quality, price, type, and other key factors to help you get more enjoyment from your backyard swimming pool.

The Hayward W3H200FDN 200K BTU (British thermal unit) universal gas heater is a top-tier choice for pool owners looking for efficient heating and straightforward operation. Designed for inground pools, this heater uses natural gas to rapidly increase water temperatures, helping users extend the swim season and maximize comfort on cooler days. Its 200,000 BTU output ensures fast heat-up times, creating a noticeable difference in hours, not days.

Thanks to universal-fit connections, installation is relatively simple, and this model also has a digital control panel for precise programming and easy diagnostics. Its durable heat exchanger is corrosion resistant, allowing use in either chlorine or saltwater pools, and its low NOx emissions meet air quality standards in all low-NOx areas. Although this Hayward requires a bit more of an upfront investment than smaller models, its energy-efficient operation and ease of use make it a value-oriented option in the long run.

Get the Hayward W3H200FDN pool heater at Amazon, The Home Depot, or Leslie’s.

The FibroPool FH255 is an electric pool heat pump with an output of 55,000 BTUs, making it suitable for inground pools up to 10,000 gallons and above-ground pools up to 21 feet round or 15 feet by 30 feet oval. As an electric heat pump, it is more energy-efficient and eco-friendly than comparable gas or propane models since it transfers heat from the surrounding air rather than burning fossil fuels, which translates to lower operating costs, especially in mild or warm climates.

This model features advanced compressors and a titanium heat exchanger for effective, reliable heating with excellent energy efficiency. The enamel-coated, weatherproof steel case ensures it can withstand a wide variety of outdoor conditions, while the user-friendly digital control panel allows straightforward temperature adjustment. However, like all air-source heat pumps, it performs best in humid conditions since moisture improves heat transfer. In dry climates, it may take longer to heat the water or use more energy to maintain a certain temperature. Overall, though, this budget-friendly pick offers a solid combination of efficient heating, durable build quality, and simple controls, making it a smart choice for both above-ground and small inground pools.

Get the FibroPool pool heater at Amazon.

The Varpoolfaye 16K BTU above-ground pool heater is designed for pools up to 5,000 gallons. Unlike many entry-level pool heaters, this model offers both heating and cooling functions. It can heat pool water to between 59 and 104 degrees Fahrenheit or cool it to between 46 and 82 degrees Fahrenheit. Its high-power compressor and titanium heat exchanger deliver efficient and reliable temperature control for multi-season use.

Engineered for energy efficiency, this small pool heater uses ambient air to regulate pool temperature, leading to lower operating costs than traditional heaters. While not intended for larger pools or inground installations, this model offers user-friendly functionality for those with smaller above-ground pools. In addition to its digital display, you can control it remotely via WiFi using the brand’s mobile app. It’s also incredibly quiet, operating at a low 50 decibels, and features a weatherproof, compact build that’s easy to install with standard pool connectors.

Get the Varpoolfaye pool heater at Amazon or Walmart.

The Hayward W3H250FDP propane pool heater delivers a solid 250,000 BTUs, making it a great choice for efficiently heating medium to large inground pools. It strikes a good balance between power and fuel efficiency, offering faster heat-up times than smaller models without the higher fuel costs associated with oversize units. The easy-to-read LED control panel displays temperature and diagnostics and includes a safety lockout to prevent unauthorized adjustments.

This model features a durable cupronickel heat exchanger that works with both saltwater and chlorine pools. Its single front-panel access point makes maintenance easier and allows for installation in tight spaces. As a propane model, it also heats water quickly, though propane can be costly over time, making this unit better for occasional heating than daily operation. Overall, the Hayward W3H250FDP delivers reliable heating performance, user-friendly controls, and a compact design that will work well for most residential inground setups.

Get the Hayward W3H250FDP pool heater at Amazon, The Home Depot, or Leslie’s.

The Dr. Infrared Heater 110K BTU DC inverter heat pump offers high-efficiency performance and advanced technology, making it a smart upgrade for both inground and above-ground pools up to 32,000 gallons. Its full DC inverter design automatically adjusts power between 20 percent and 100 percent to deliver the ideal balance of energy savings and heating speed. A twin rotary compressor and spiral titanium heat exchanger improve heat transfer and stability while reducing noise and vibration for incredibly quiet operation.

This model includes built-in WiFi smart controls, allowing you to monitor and adjust pool temperatures remotely through the companion app. Its non-corrosive construction is great for especially humid or coastal environments, and certifications from CSA and AHRI highlight its durability and performance. While the upfront cost is higher than average, the energy savings, consistent heating, and low noise levels make this electric heat pump a reliable and user-friendly choice.

Get the Dr. Infrared Heater pool heater at Amazon or Dr. Infrared Heater.

The Hayward W3H150FDP propane pool heater delivers 150,000 BTUs of powerful propane heating power, making it an excellent choice for large above-ground pools or smaller inground pools. It features a cupronickel heat exchanger and a Hayward-patented polymer header designed to improve efficiency and reduce energy consumption.

The forced-draft combustion system on this model maintains consistent airflow through the combustion chamber, minimizing the effects of wind and weather on heating performance. It also has front-panel access to simplify service and maintenance, plus easy-to-use digital controls that make it easy to monitor and adjust temperatures. For those looking for quick, reliable propane heating and who don’t mind the ongoing costs of refueling it, this compact model offers strong performance in a variety of conditions.

Get the Hayward W3H150FDP pool heater at Amazon, The Home Depot, Walmart, or Leslie’s.

The Lochinvar EnergyRite natural gas pool heater delivers powerful, fast heating for large inground pools and spas. With a robust 400,000 BTU output, it offers some of the quickest heat-up times available, making it ideal for pool owners who want their water ready on demand. The durable cupronickel heat exchanger and polymer headers maximize heat transfer while reducing energy use and corrosion risk, boosting both efficiency and longevity.

This natural gas pool heater features a user-friendly two-line digital display for precise temperature control, password protection, and easy-to-understand diagnostics. Its combustion chamber is sealed and fan-assisted for safe and consistent performance. This model supports both CPVC and PVC plumbing, has a direct-spark ignition, and has a built-in combustible floor shield. So long as you have a chlorine pool (it’s not compatible with salt water) and a natural gas line for installation, the EnergyRite offers fast, efficient heating in a durable package.

Get the Lochinvar pool heater at Leslie’s.

The SunHeater Smart Pool S601P solar heating system is an energy-efficient option for raising pool temperatures without adding to your energy bill. Designed for above-ground and small inground pools, it relies on 80 square feet of durable, polypropylene panels that can be installed on a long roof, a fence, or a broad yard—anywhere with good sun exposure. Each panel uses individually fed collector tubes and fiberglass-reinforced headers for improved heat transfer and durability. Built-in wind vents help protect the system during windy conditions. 

With ample sunlight, the S601P can boost pool water temperature by as much as 15 degrees Fahrenheit, significantly extending the swim season. Installation is relatively straightforward if you have enough space, though it’s important to note that the required installation kit is sold separately, so you’ll need to factor that extra expense into your plans. Overall, the SunHeater S601P is a practical and cost-effective solution for those looking to harness solar energy and enjoy a warmer pool while avoiding ongoing utility costs.

Get the SunHeater pool heater at Amazon or Leslie’s.

The Hayward W3H400FDN 400K BTU natural gas pool heater delivers powerful, efficient heating with exceptional durability, even in saltwater pools. Its premium cupronickel heat exchanger offers industry-leading resistance to corrosion and erosion, making it an excellent choice for pools that use saltwater chlorination or have varying water chemistry. This natural gas heater provides rapid warming for water features up to 45,000 gallons, while the user-friendly LED control panel offers clear temperature readings, diagnostics, and simple operation.

Engineered for reliability and ease of maintenance, the W3H400FDN features Hayward’s patented polymer header bypass design to improve hydraulic efficiency and protect against wear in high-flow conditions. Advanced electronics ensure accurate temperature control and self-monitoring for consistent performance. This model also meets low NOx emissions standards, making it a great choice for pool owners who want robust heating power without sacrificing eco-friendliness.

Get the Hayward W3H400FDN pool heater at Amazon, The Home Depot, or Leslie’s.

How We Chose the Best Pool Heaters

To put together a list of the best swimming pool heaters, we researched a variety of pool heat pump models, solar heaters, natural gas pool heaters, and propane pool heater products. We also considered whether each product was suitable for inground pools, above-ground pools, or both. Many of our top picks include pool heaters for inground pools, which often require greater heating capacity and durability due to larger volumes and more complex plumbing setups. 

Since pool heaters operate outdoors, we looked for weather-resistant casing or enclosures to protect internal components from harsh climates. To keep operating costs low, we prioritized models with designs that increase energy efficiency. BTUs were another important consideration, as they directly impact how effective a heater is at warming a swimming pool.

According to Alicia Toedter, a pool and spa care education and content leader for Leslie’s, “A single BTU of heat energy will raise the temperature of a pound of water by 1 degree Fahrenheit. It takes 8.33 BTUs to warm a gallon of water by 1 degree Fahrenheit. Larger pools require a higher BTU rating than a small pool.” 

What to Consider When Choosing a Pool Heater

Before choosing a pool heater for your pool, take a few minutes to learn more about the most important shopping considerations.

Types of Pool Heaters 

Pool heaters come in three main types, classified by their power source: gas (natural or propane), solar, and electric.

Gas

A gas heater uses propane or natural gas to quickly and effectively heat the water in the pool to the desired temperature. They’re the most common choice in colder climates where swimming seasons are short, outperforming both electric and solar heaters in heat output and warm-up time. However, gas heaters come with a high upfront cost and ongoing fuel expenses.

Solar

Solar pool heaters range from simple solar blankets that float on the water’s surface to more advanced systems that rely on black or dark tubing installed outside the pool (often on a roof) to absorb the sun’s heat. These systems circulate pool water through the heated tubes before returning it to the pool.

While solar heaters are less effective in colder climates due to their reliance on sunlight and ambient air temperature, they are the most energy-efficient and affordable option for pool heating in warmer areas.

Electric

Electric heaters come in two types. The first is a direct-flow heater that uses electricity to warm water as it passes through the unit, similar to a tankless water heater. These compact units are quite expensive to buy and operate, falling just below gas pool heaters in initial cost and exceeding them in ongoing electricity costs.

The second style is a heat-pump-based electric heater, which draws heat from the surrounding air (similar to how an air conditioner works, but in reverse). Heat pumps are less effective in colder climates since they rely on ambient air temperature. While not exactly cheap, they generally cost less to operate than gas heaters.

Location 

The location of your pool heater is an important factor to consider, as installation needs vary by heater type and may require space in your yard or on your home.

• Gas pool heaters normally sit beside the pool or in a nearby utility shed so that they can connect easily to the water pump and filtration system. These heaters are larger than electric pool heaters but require significantly less space than a solar heater.
• Electric pool heaters are about one-half to one-quarter the size of gas pool heaters and are typically installed beside the pool or alongside the pump and filtration system. 
• Solar pool heaters take up the most space and require the most planning prior to installation. Some units sit beside the pool, while others can be mounted on fencing, decking, or even a roof to absorb as much heat as possible. Proper measuring and layout planning are essential to ensure there’s enough room for the system.

Pool Size

Pool size is a major factor to keep in mind while shopping for a pool heater because heating your pool requires more energy the larger it is. For this reason, solar pool heaters are rarely used alone for very large pools, though you may be able to combine multiple units to provide sufficient heating.

For large pools, gas or powerful electric heaters are typically better choices. Pool heater capacity is measured in BTUs (British thermal units)—with 1 BTU raising the temperature of 1 pound of water by 1 degree Fahrenheit. The higher the BTU rating, the faster the heater can warm your pool.

Water Temperature in Season 

Climate plays a major role in choosing the right pool heater. In warm climates, almost any heater will work, but a large gas heater’s power may be unnecessary and costly. Solar heaters or electric heat pumps that draw heat from the air are usually the most efficient options in these areas.

In colder climates, however, gas pool heaters are often essential. Solar heaters and electric heat pumps tend to be less effective due to limited sunlight and lower ambient air temperatures.

Heat Conservation 

Pool heaters transfer heat to the water as it flows through the system, and to keep that heat from escaping, they use insulating materials like foam or plastic. This is especially important for solar pool heaters, which are installed outdoors to capture sunlight. However, because they’re exposed, the design and materials must carefully balance efficient heat absorption with minimizing heat loss.

Heater Casing 

Gas and electric pool heaters both have casings designed to shield the unit from water, moisture, impact damage, and temperature fluctuations. These cases are also insulated to prevent heat loss as water flows through the system. Many are designed with aesthetics in mind to blend into your yard.

Solar pool heaters, on the other hand, don’t rely on protective casings. Instead, their components spread across a wide area to maximize sun exposure and heat absorption, so casing isn’t as much of a concern.

Flow-Rate Calibration  

Flow rate is the measurement of the volume of water that can pass through the pump within a given period of time. Flow-rate calibration lets pool owners adjust this rate by opening or closing the inlet or outlet valves, controlling how much water flows through the heater.

This feature is uncommon since the pump and filtration systems usually manage the flow rate. However, some pool heaters allow calibration, giving owners the option to optimize water flow to their preference.

Winterizing 

Winterizing is the act of preparing the pool, pump, filtration system, pool heater, and any other pool components for freezing temperatures so that the hoses, brackets, filters, and internal parts do not bend and break because of ice. 

Pool owners must completely remove solar pool heaters to safely close a pool for the season, which is another reason why solar heaters are not a great option for colder climates. Electric pool heaters and gas pool heaters both can be winterized by disconnecting the power source and hoses, emptying the water, storing the components safely through the winter, and blowing out any remaining water with a wet/dry shop vacuum or a leaf blower.

Ease of Installation

If you plan to install a pool heater yourself, it’s important to consider the difficulty of the installation:

• Solar pool heaters are time-consuming to install, but they’re generally the easiest for DIYers to set up as long as there is plenty of space and users have the additional tools or ladders the job might require.
• Electric pool heater installation is typically best left to the professionals. Even if users connect the piping for the flow of the water, it is always better to have an electrician connect and confirm that the electrical system is working and safe, especially with electrical equipment around water.
• Gas pool heaters are the most difficult to set up because they often require both gas and electrical feeds. As with electric pool heaters, consider hiring a professional to ensure the gas connections are secure before using the pool heater.

Maintenance  

Just like maintaining a pool, heaters require ongoing upkeep to stay efficient. This includes winterizing (depending on your location), cleaning, and repairs. It’s recommended to have a professional inspect your pool heater at least once a year, or twice a year if you use it year-round.

If you’re concerned about maintenance or potential breakdowns, consider choosing a heater with a long warranty to ensure you can get replacement parts or even a new unit if needed.

FAQs

Read on below to find answers to some of the most frequently asked questions about heat pumps for pools.

 

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