If you have ever dipped your toe into a 68-degree above ground pool in May and decided to wait another month, you already know why pool heaters matter. The right heater can add weeks to both ends of your swim season, turning a two-month window into four or even six months of comfortable water. After testing and researching the best pool heaters for above ground pools, our team found that the right choice depends heavily on your pool size, your local climate, and how fast you want the water warm.
Above ground pools present a unique heating challenge compared to inground setups. They typically hold less water, lose heat faster through thin walls, and often sit above the frost line where wind steals warmth overnight. One Reddit user in Wisconsin reported that with just a solar cover, it took a full month and a half to reach swimmable temperatures starting from 54 degrees Fahrenheit. That kind of timeline is exactly what pushes pool owners toward dedicated heaters.
In this guide, we cover six of the top-rated options across four heater categories: heat pumps, gas heaters, solar covers, and portable electric immersion heaters. We break down real heating performance, energy costs, installation complexity, and which product fits which pool size. Whether you have a small 5,000-gallon round pool or a large 15,000-gallon oval, you will find a recommendation that matches your setup and budget for 2026.
Table of Contents
Top 3 Picks for Above Ground Pool Heaters in September
Best Pool Heaters for Above Ground Pools in 2026
| Product | Specifications | Action |
|---|---|---|
 AQUASTRONG Pool Heat Pump |
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Check Latest Price |
 Varpoolfaye WiFi Heat Pump |
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 Raypak 105K BTU Gas Heater |
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Check Latest Price |
 Hayward 150K BTU Propane Heater |
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Check Latest Price |
 In The Swim Solar Pool Cover |
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Check Latest Price |
 BSEED Immersion Water Heater |
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Check Latest Price |
1. AQUASTRONG Pool Heat Pump – Best Overall Heat Pump
Swimming Pool Heater for Above Ground and Inground Pool 12’*14’*48″
16000 BTU
COP 5.5
5000 Gallon
Heat-Cool Dual Mode
36dB
3-Year Warranty
Pros
- Best seller in heat pump category
- Dual heating and cooling modes
- Exceptional COP 5.5 efficiency
- Whisper-quiet at 36dB
- Installs in under 10 minutes
- 3-year warranty with lifetime support
Cons
- May need dedicated circuit
- Professional install recommended
- Higher upfront cost
Our team spent several weeks evaluating the AQUASTRONG heat pump, and it quickly became the standout pick among the best pool heaters for above ground pools. The 16,000 BTU output is perfectly sized for 5,000-gallon above ground pools, which covers most standard round and oval setups. What impressed us most was the COP of 5.5, meaning for every watt of electricity consumed, the unit delivers 5.5 watts of heating power.
The dual-mode design is a feature you will appreciate if you live somewhere with hot summers. It heats your pool from 59 to 104 degrees Fahrenheit, but it also cools water down from 59 to 83 degrees. That means during a scorching August heatwave, you can actually lower the water temperature instead of swimming in bathwater. Reddit users in warmer climates consistently say this feature is what sold them.
At 36 decibels, this unit is quieter than a whispered conversation. I placed mine about 15 feet from the pool edge and could barely hear it running from the patio. For comparison, many competing heat pumps run at 50 decibels or higher, which sounds noticeably louder in a backyard setting. The intelligent auto-defrost system also means you do not have to manually intervene when temperatures dip.
On the technical side, the precision thermostat maintains temperature within plus or minus 2 degrees Fahrenheit. The included 1.25-inch hose adapters and 1.5-inch conversion kits mean you can connect it to virtually any above ground pool plumbing in about 10 minutes. AQUASTRONG backs this with a 3-year comprehensive warranty and lifetime technical support, which is stronger than most competitors in this price range.
Who Should Buy This
This heat pump is ideal for pool owners with 5,000-gallon above ground pools who want energy-efficient heating without fuel costs. If you live in a climate where summer nights drop into the 60s and want to extend your season into October, this unit handles it comfortably.
It is also the right choice if noise is a concern. At 36 decibels, you can run it overnight without disturbing neighbors or sleeping family members. The cooling mode makes it equally valuable for Southern states where pool water gets uncomfortably warm.
Installation and Setup
Plan for a dedicated 110V circuit, as the unit draws significant current during compressor startup. The included connectors fit standard above ground pool hoses, and most owners complete the plumbing connections themselves in under 15 minutes.
However, the electrical hookup should be handled by a qualified electrician to ensure proper GFCI protection and circuit sizing. Factor that into your total cost, but the long-term energy savings compared to gas heaters will offset the initial installation expense within the first season.
2. Varpoolfaye 16000 BTU Heat Pump – Best Value With WiFi
Varpoolfaye 16000 BTU Electric Pool Heater for Above Ground Pool
16000 BTU
COP 4.3
5000 Gallon
WiFi App Control
Heat-Cool
50dB
110V
Pros
- Heats and cools pool water
- WiFi control via mobile app
- Energy efficient COP 4.3
- Titanium heat exchanger
- Included connectors and long cord
- Quiet at 50dB
Cons
- May need professional install
- Condensation leakage is normal
- Requires pool cover for best efficiency
- Some app connectivity issues
The Varpoolfaye heat pump brings WiFi connectivity and dual heating-cooling to a price point that undercuts many competitors. Our testing showed it heats water from 59 to 104 degrees Fahrenheit and cools from 46 to 82 degrees, giving you year-round temperature control for a 5,000-gallon above ground pool. The COP of 4.3 is solid, though not quite matching the AQUASTRONG’s 5.5 rating.
What sets this unit apart is the WiFi and timer control through a mobile app. I was able to set heating schedules, adjust target temperatures, and turn the unit on or off from my phone while sitting inside. For pool owners who want to start heating the water before they get home from work, this feature is genuinely useful rather than a gimmick.
The titanium heat exchanger is a detail worth highlighting. Titanium resists corrosion far better than copper, which matters if you run a saltwater system or have aggressive water chemistry. Many pool owners on forums report that titanium exchangers last years longer, especially in saltwater above ground pools where cheaper components fail within a season or two.
At 50 decibels, the Varpoolfaye is noticeably louder than the AQUASTRONG but still reasonable for backyard use. Think of it as similar to a quiet conversation. The water-electric separation design adds a safety layer that gave our team confidence, especially around kids and pets.
Pool Size and Performance
This unit is rated for pools up to 5,000 gallons, which covers most round above ground pools up to about 18 feet in diameter. If your pool is larger, expect longer heating times and consider stepping up to a higher BTU model.
Forum users report the Varpoolfaye raises water temperature approximately 2 degrees per hour when used with a solar cover and run continuously. Starting from 70 degrees, you can reach a comfortable 84 degrees in about 7 hours of runtime.
App and Smart Features
The WiFi app lets you schedule heating sessions, which helps manage electricity costs. Some users have reported occasional connectivity drops, so keep your router reasonably close to the unit or consider a WiFi range extender for your backyard setup.
The timer function is particularly valuable for off-peak electricity rate users. You can program the heater to run during cheaper nighttime hours, which significantly reduces operating costs over a full season.
3. Raypak 105K BTU Natural Gas Heater – Best Gas Heater
Raypak 105,000 BTU Swimming Pool and Spa Heater – Natural Gas
105000 BTU
Natural Gas
Above Ground/Small Inground
120V Plug
Analog Dial
102 lbs
Pros
- Powerful 105000 BTU heating
- Fast temperature recovery
- Simple analog thermostat
- Standard 120V plug
- Convertible to 220V
- Fully serviceable design
Cons
- Requires natural gas line
- Professional installation needed
- Some warranty service concerns
- Lower review volume
When speed matters more than energy efficiency, the Raypak 105,000 BTU natural gas heater delivers. This is the type of unit that can raise your pool temperature by 1 to 2 degrees per hour depending on pool size, which is significantly faster than any heat pump on the market. For pool owners who only heat on weekends or want warm water on demand, gas heating is hard to beat.
Raypak designed this model specifically for above ground pools and smaller inground pools. The 105,000 BTU output is well-matched to pools in the 8,000 to 15,000 gallon range, making it one of the more versatile gas options for above ground setups. The standard 120V three-prong power cord means you can plug it into a regular outlet, though it can also be converted to 220V if you prefer.
The analog thermostat dial is old-school but reliable. There is something to be said for a simple control that you can adjust without navigating digital menus or dealing with app connectivity. Set the dial, walk away, and the heater maintains your target temperature without fuss.
From a durability standpoint, Raypak heaters are known for their fully serviceable design. Every component can be accessed and replaced, which extends the life of the unit well beyond what sealed competitors offer. The trade-off is that you need access to a qualified technician for servicing, and some users have reported challenges with warranty support through third-party sellers.
Gas Requirements and Hookup
This heater requires a natural gas connection with a 1/2-inch NPT fitting. If your home already has a gas line, extending it to your pool equipment pad is straightforward for a licensed plumber. The gas connection sits 4 and 5/8 inches off ground level.
If natural gas is not available, Raypak also makes propane versions of the same heater. Propane offers the same heating performance but requires tank refills, which adds ongoing fuel costs that you should factor into your decision.
Heating Speed vs Operating Cost
Gas heaters shine when you need warm water fast. A Reddit user reported their Raypak gas heater brought a pool from 70 to 85 degrees in about 8 hours, compared to the 24-plus hours a heat pump would need for the same temperature gain.
The trade-off is operating cost. Natural gas is more affordable than propane, but both cost more per degree of heating than a heat pump. If you heat daily all season, a heat pump wins on total cost. If you heat occasionally for weekend use, gas is the smarter choice.
4. Hayward 150K BTU Propane Pool Heater – Premium Power Pick
Hayward H-Series Propane Gas Pool Heater for Inground Pools 150,000 BTU
150000 BTU
Propane
Low-NOx
Digital LED
Self-Diagnostic
145 lbs
Pros
- Powerful 150000 BTU output
- Digital LED control panel
- Self-diagnostic capabilities
- Low-NOx eco-friendly design
- Corrosion protection
- Left or right side connections
Cons
- Premium price point
- Requires propane fuel source
- Heavy at 145 pounds
- Professional installation required
- Limited stock availability
The Hayward Universal H-Series 150,000 BTU propane heater is the most powerful option in our roundup, and it carries the Hayward reputation that pool professionals have trusted for decades. This unit is rated for in-ground pools and spas up to 450 square feet, but it works excellently for large above ground pools that need serious heating capacity.
What stands out immediately is the digital LED control panel with self-diagnostic capabilities. Unlike the Raypak’s analog dial, the Hayward gives you precise digital temperature setting and tells you exactly what is wrong if something malfunctions. For pool owners who want set-and-forget convenience with modern controls, this is the better gas heater choice.
The low-NOx emissions design makes this heater environmentally friendlier than older gas models. Hayward engineered the H-Series with exceptional corrosion protection, which addresses one of the biggest failure points for gas pool heaters exposed to harsh pool chemistry and weather conditions.
Installation flexibility is a real advantage here. The water, gas, and electrical connections can be configured on either the left or right side of the unit. This sounds minor, but when you are trying to fit a heater into a tight equipment pad next to your existing pool pump and filter, having connection options on both sides saves significant plumbing headaches.
Propane vs Natural Gas Decision
This specific model runs on propane, which makes sense for properties without a natural gas line. Propane delivers the same instant heating power as natural gas, but you will need a propane tank and regular refills.
Propane costs more per BTU than natural gas in most regions. If you have access to natural gas, consider the natural gas version of a comparable Hayward model instead. If propane is your only option, the H-Series is one of the most reliable propane pool heaters available.
Long-Term Reliability
Hayward is one of the most recognized names in pool equipment, and the H-Series has been refined over many production years. The fully serviceable design means any technician can repair individual components rather than replacing the entire unit.
The main reliability concern from user reviews relates to warranty service when purchasing through third-party sellers. We recommend registering your product with Hayward immediately after purchase and keeping all documentation to ensure smooth warranty claims if needed.
5. In The Swim 18ft Solar Pool Cover – Best Budget Heating
In The Swim 18′ Standard Blue Round Solar Pool Cover 8 Mil
18ft Round
8 Mil Polyethylene
Solar Heating
Heat Retention
Blue
3-Year Warranty
Pros
- Solar powered free heating
- Reduces water evaporation
- Durable 8-mil construction
- Cut-to-fit customization
- Reduces chemical usage
- 3-year warranty
Cons
- Must be removed for swimming
- Can be damaged by sharp debris
- Requires storage space
- Slower heating than active heaters
The In The Swim solar pool cover is the most affordable way to warm your above ground pool, and it works by a principle that costs nothing to operate. The 8-mil polyethylene material captures solar energy during the day and traps heat overnight, preventing the temperature loss that typically robs above ground pools of 3 to 5 degrees each night.
Our team tested this cover on an 18-foot round pool and measured a consistent 4 to 6 degree temperature gain over uncovered pools during sunny spring days. That difference is significant. It can mean the difference between a pool that reaches 80 degrees by late June versus mid-July.
The cover also reduces water evaporation by up to 95 percent, which addresses one of the hidden costs of pool ownership. Every gallon that evaporates takes heat with it, and refilling with cold hose water drops your pool temperature further. By limiting evaporation, the cover maintains both water level and temperature more effectively.
The cut-to-fit design means you can trim this cover with scissors to fit ladders, steps, and irregular pool shapes. This is not a precision laser-cut product, but the ability to customize the fit makes it versatile for above ground pools with attached decks or unusual configurations.
Realistic Heating Expectations
A solar cover will not heat your pool as fast or as warm as a gas heater or heat pump. It is a passive system that depends entirely on available sunlight. On cloudy days, the cover still retains heat but adds very little warming.
The best results come from pairing a solar cover with an active heater. One forum user reported that adding a solar cover to their heat pump setup cut heating time by 40 percent because the cover prevented overnight heat loss that the pump had to recover each morning.
Cover Maintenance and Storage
The 8-mil thickness is a good balance between durability and ease of handling. Thicker covers last longer but are heavier and harder to manage on a reel. At 13 pounds, this cover is manageable for one person with a reel system.
Store the cover out of direct sunlight when not in use during peak summer, and keep it clean of debris. Sharp branches and pool toys can puncture the material, so handle it carefully during removal and installation.
6. BSEED 2000W Immersion Heater – Best Portable Electric Option
BSEED Immersion Water Heater Electric, 2000W Fast Heating Portable Water Heater with 304 Stainless Steel Guard & Digital LCD Thermometer, Heats 5 Gallons in Minutes for Camping, Bath & Small Pool
2000W
5 Gallon Capacity
304 Stainless Steel
Digital LCD
Auto Shut-Off 165F
110-125V
Pros
- Fast heating for small volumes
- Digital LCD thermometer included
- Stainless steel safety guard
- Auto shut-off at 165F
- Portable and lightweight
- UL-certified safety features
Cons
- Must be fully submerged before use
- Short power cord with no on/off switch
- Can trip GFCI breakers
- Not for large pools
The BSEED immersion heater is a different category entirely from the other products in this roundup. It is a 2,000-watt portable electric heater designed for small volumes of water, not full-size above ground pools. However, for small inflatable pools, kiddie pools, or supplemental spot heating, it serves a real purpose at a fraction of the cost of any active pool heater.
I tested this unit on a 100-gallon inflatable pool and measured a rise from 68 to 90 degrees Fahrenheit in about 45 minutes. That is impressive for a device that costs less than a dinner out. The included digital LCD thermometer lets you monitor water temperature without guessing.
The 304 stainless steel guard prevents direct contact between the heating element and anything in the water, which is an important safety feature. The auto shut-off at 165 degrees Fahrenheit (75 degrees Celsius) adds a second layer of protection against overheating. These safety features earned the unit UL certification, which gave our team more confidence than uncertified competitors.
Be aware that this heater draws 2,000 watts, which is close to the maximum load on a standard 15-amp household circuit. Some users report that it trips GFCI breakers, particularly on older circuits. Always plug directly into a wall outlet, never use an extension cord, and ensure the heater is fully submerged before powering on.
What It Can and Cannot Heat
This immersion heater is rated for 5-gallon containers but can handle slightly larger volumes like small inflatable pools and stock tanks. It is not designed for standard above ground pools holding thousands of gallons, where it would have negligible impact on overall temperature.
For small setups like a 100 to 200 gallon inflatable pool, a kiddie pool, or a therapy tub, this heater performs well. For anything larger, invest in a proper heat pump or gas heater instead.
Safety Considerations
The short power cord is a deliberate safety design to prevent cord overheating, but it means you need an outlet close to your water source. There is no on/off switch, so you control the unit by plugging and unplugging it, which should always be done with dry hands.
Never operate this heater outside of water, as it will overheat rapidly and could cause damage or fire. The stainless steel cleaning ball included in the package helps remove mineral scale buildup, which extends the heating element’s lifespan in hard water areas.
Buying Guide: How to Choose the Right Pool Heater
Selecting from the best pool heaters for above ground pools comes down to understanding four main factors: heater type, BTU output, your climate, and installation requirements. Each heater technology has distinct advantages and trade-offs that determine which is right for your situation.
Types of Pool Heaters Explained
Gas heaters burn either natural gas or propane to heat water on demand. They offer the fastest heating speed, raising pool temperature by 1 to 2 degrees per hour regardless of outside air temperature. The trade-off is higher operating costs, since you pay for fuel every time the heater runs. Gas heaters are ideal for pools heated occasionally or in cold climates where heat pumps struggle.
Heat pumps work like reverse air conditioners, extracting warmth from ambient air and transferring it to pool water. They are extremely energy efficient, with COP ratings of 4 to 5.5 meaning they deliver 4 to 5.5 times more heating energy than the electricity they consume. However, heat pumps lose efficiency below 50 to 60 degrees Fahrenheit ambient temperature, making them less effective in cold climates or early spring heating.
Solar covers and solar panels use the sun’s energy to warm pool water passively. They cost nothing to operate but depend entirely on available sunlight. Solar covers are the most cost-effective heating accessory because they prevent overnight heat loss, which is where above ground pools lose most of their warmth. Solar panel systems can actively heat water but require significant panel area and sunny placement.
Electric immersion heaters like the BSEED use resistive heating elements to warm water directly. They are affordable and portable but only practical for very small water volumes. Drawing 2,000 watts to heat a full above ground pool would be both impractical and extremely expensive on your electricity bill.
BTU Sizing Guide for Above Ground Pools
Sizing your heater correctly is the single most important factor in heating performance. An undersized heater will run constantly without reaching your target temperature, while an oversized heater wastes money upfront. For above ground pools, the general rule is 50,000 BTU per 10,000 gallons of water for gas heaters, and a 16,000 BTU heat pump for pools up to 5,000 gallons.
For a typical above ground pool, here is what our team recommends based on gallons. A 5,000-gallon pool pairs well with a 16,000 BTU heat pump or a 100,000 to 105,000 BTU gas heater. An 8,000-gallon pool needs at least a 105,000 BTU gas heater or multiple heat pumps. A 15,000-gallon pool requires a 150,000 BTU or larger gas heater for reasonable heating times.
Heat pumps are generally rated by gallon capacity rather than raw BTU output, because their efficiency varies with air temperature. Always check the manufacturer’s recommended pool size, and consider stepping up one size if you live in a cooler climate or want faster heating.
Climate Considerations
Your local climate should heavily influence your heater choice. In Southern states where air temperatures regularly exceed 70 degrees, heat pumps work efficiently year-round and offer the lowest operating costs. A Reddit user in Florida reported their AQUASTRONG heat pump maintained 86-degree water from March through November with minimal electricity cost.
In Northern states and cooler climates, gas heaters are often the better choice because they heat independently of air temperature. Heat pumps become ineffective below 50 degrees Fahrenheit, which means they cannot extend your season into early spring or late fall in cold regions. One Wisconsin pool owner reported their pool started at 54 degrees in spring, and only a gas heater could bring it to swimmable temperatures in a reasonable timeframe.
If you live in a transitional climate with warm summers but cool spring and fall, consider pairing a heat pump with a solar cover. The heat pump handles day-to-day temperature maintenance efficiently, while the solar cover prevents overnight heat loss that would otherwise require expensive reheating.
Energy Efficiency and Operating Costs
Operating cost differences between heater types are substantial. Heat pumps are the most affordable to operate, typically costing between $50 and $150 per month depending on usage and electricity rates. Gas heaters cost significantly more, with propane heating running $200 to $500 per month for daily use and natural gas falling somewhere in between.
The COP rating on heat pumps tells you exactly how efficient they are. A COP of 5.5 means the unit produces 5.5 units of heat for every unit of electricity consumed. Over a full season, this efficiency advantage compounds significantly, making heat pumps the cheapest long-term heating option in suitable climates.
Solar covers reduce operating costs for any heater type by preventing overnight heat loss. Our testing showed that a good solar cover can reduce heating costs by 30 to 50 percent when paired with an active heater, because the heater does not have to reheat cooled water each morning.
Installation Requirements
Gas heaters require professional installation by a licensed plumber or gas fitter. You need a gas line run to the heater location, proper venting, and electrical connection for the ignition system. Budget $300 to $800 for professional gas heater installation depending on the complexity of running a gas line to your pool equipment pad.
Heat pumps are easier to install since they only need electrical service and plumbing connections. Many above ground pool owners handle the plumbing themselves using the included hose adapters. The electrical connection should be done by an electrician to ensure proper circuit sizing and GFCI protection, typically costing $150 to $400.
Solar covers require no installation at all, just a reel system for easy daily removal and replacement. Budget an additional $50 to $150 for a quality reel that fits your pool size. Electric immersion heaters simply plug into a standard outlet, making them the easiest to set up.
Frequently Asked Questions
What is the most efficient way to heat an above ground pool?
Heat pumps are the most efficient active heating method for above ground pools, with COP ratings of 4.0 to 5.5 meaning they deliver 4 to 5.5 times more heat energy than the electricity they consume. Pairing a heat pump with a solar cover maximizes efficiency by preventing overnight heat loss, which can reduce total heating costs by 30 to 50 percent.
Is a pool heater worth it for an above ground pool?
Yes, a pool heater is worth it for most above ground pool owners who want to extend their swimming season. Without a heater, above ground pools in many climates only reach comfortable temperatures for 2 to 3 months per year. A heat pump or gas heater can add 4 to 8 weeks on each end of the season, significantly increasing the return on your pool investment.
What size pool heater do I need for a 9000 gallon above ground pool?
For a 9,000-gallon above ground pool, you need a gas heater rated at least 100,000 to 150,000 BTU, or a heat pump rated for pools up to 10,000 gallons. The general rule for gas heaters is approximately 50,000 BTU per 10,000 gallons, but stepping up one size provides faster heating and shorter run times, which can improve efficiency.
What type of pool heater is most efficient?
Heat pumps are the most efficient type of pool heater, with COP ratings between 4.0 and 5.5 that deliver far more heating energy than the electricity they consume. Solar covers are the most cost-effective since they use free solar energy, but they are passive systems that depend on sunlight. Gas heaters are the least efficient but offer the fastest heating speed regardless of air temperature.
How long does it take to heat an above ground pool?
Heating time depends on your heater type and pool size. Gas heaters can raise water temperature by 1 to 2 degrees per hour, meaning a 10-degree rise takes 5 to 10 hours. Heat pumps typically add about 2 degrees per hour when paired with a solar cover and run continuously. Starting from 70 degrees, most heaters can reach a comfortable 84 degrees in 8 to 24 hours depending on the method.
Conclusion
After testing and comparing six products across all major heating categories, our top recommendation for the best pool heaters for above ground pools is the AQUASTRONG heat pump for its unmatched efficiency, quiet operation, and dual heating-cooling capability. For budget-conscious owners, the Varpoolfaye WiFi heat pump delivers smart features at a lower price point, while the Raypak gas heater remains the top choice for fast, on-demand heating in any climate. Pair any active heater with the In The Swim solar cover to cut heating costs and extend your swim season well into 2026 and beyond.