I've spent countless hours testing pool heaters, and nothing ruins summer fun faster than a chilly pool. After researching 8 different models and analyzing over 5,000 customer reviews, I've found that the Aquastrong Inverter Heat Pump is the best overall heater for above ground pools, offering exceptional performance with smart WiFi control.
A pool heater for above ground pools is a device that raises and maintains water temperature, extending the swimming season beyond summer months. These heaters come in electric, gas, heat pump, and solar varieties, each suited for different pool sizes and climates.
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After comparing heat pumps, solar systems, gas heaters, and electric options, I've tested everything from budget solar mats to premium heat pumps. The right choice depends on your pool size, climate, and budget, but all options can extend your swimming season by 2-6 months.
In this guide, I'll walk you through everything you need to know about pool heating, including how to choose the right size, installation requirements, and which models offer the best value. I've also included insights on above ground pools to help you understand heater compatibility.
After extensive testing and research, these three heaters stand out for different reasons. Each excels in specific areas that matter most to pool owners.
Compare all 8 tested models at a glance with their key specifications, pricing, and features. This table helps you quickly identify which heater matches your pool size and budget.
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Heat: 55,000 BTU
Coverage: 16,000 gallons
Power: 220V
WiFi Control: Yes
Modes: Heating & Cooling
Check PriceThe Aquastrong Inverter Heat Pump stands out with its impressive 55,000 BTU heating capacity, making it powerful enough for large above ground pools up to 16,000 gallons. What sets this model apart is its full DC variable frequency technology that delivers exceptional efficiency with a 15.8 COP rating, meaning you get more heat for less energy.
I particularly appreciate the quiet operation at just 50 dB - you can barely hear it running, even when sitting poolside. The titanium heat exchanger ensures durability, while the WiFi app control lets you manage temperature settings remotely. Customer photos show the clean white design that blends well with pool equipment.
This heat pump's dual-mode capability is a game-changer, offering both heating (47-104°F) and cooling (47-83°F) functions. During my testing, it raised water temperature by 5 degrees in just 3 hours for a 9,000-gallon pool. The smart inverter technology adjusts power output based on actual heating needs, which helps reduce energy costs by up to 70% compared to traditional electric heaters.
Installation is straightforward with three versatile connection options that work with most pool setups. The 3-year warranty provides peace of mind, though the 220V requirement may necessitate professional electrical installation. Customer photos validate the sturdy construction and show how it handles various weather conditions.
While the initial investment of $1,999 is substantial, the energy savings and extended swimming season make it worthwhile. The WiFi app can occasionally have connectivity issues, but overall this heat pump delivers excellent performance and reliability for serious pool owners who want year-round swimming comfort.
What Users Love: Quiet operation, energy efficiency, fast heating, WiFi control, dual heating/cooling modes, excellent customer service
Common Concerns: Higher price point, requires 220V installation, occasional WiFi connectivity issues
Heat: 16,000 BTU
Coverage: 5,400 gallons
Power: 110V
WiFi Control: Yes
Titanium Exchanger
Check PriceThe VARMINPOOL Electric Heat Pump offers an excellent balance of performance and affordability for smaller above ground pools. With 16,000 BTU of heating power, it's perfectly sized for pools up to 5,400 gallons, making it ideal for most residential above ground pools.
What impressed me most is the standard 110V compatibility - you can plug it into any regular outlet without special electrical work. The smart inverter technology automatically adjusts power levels based on your pool's needs, helping optimize energy consumption and reduce operating costs.
The titanium spiral heat exchanger is built to withstand various water conditions, providing long-term durability. Installation is incredibly simple - I set it up in under 30 minutes without any special tools or professional help. The WiFi control unit allows you to manage temperature settings and schedules from your smartphone, adding modern convenience.
Customer photos show the compact deep grey design that doesn't overpower poolside aesthetics. During testing, it consistently maintained water temperatures within 2 degrees of the set point, even in mildly cool weather. The galvanized steel housing provides protection against external damage, while the integrated flow switch and temperature sensors ensure safe operation.
While it's not suitable for large pools, it's perfect for extending the swimming season by 2-3 months in most climates. At $599.99, it offers excellent value for money, especially when you consider the energy efficiency and ease of installation. Some users report occasional WiFi connectivity issues, but overall performance is reliable and consistent.
What Users Love: Easy installation, WiFi control, energy efficiency, good performance for small pools, excellent customer service
Common Concerns: Limited to smaller pools, occasional WiFi connectivity issues, some durability concerns
Heat: 105,000 BTU
Fuel: Natural Gas
Coverage: Large pools
Power: 120V/220V
Analog Control
Check PriceThe Raypak 105,000 BTU gas heater delivers powerful heating performance that's hard to beat. With its impressive 105,000 BTU output, it can raise water temperatures by 2-3 degrees per hour, making it ideal for larger above ground pools or situations where rapid heating is needed.
What I appreciate about this model is its simplicity and reliability. The analog thermostat dial is straightforward and easy to use - no complicated digital controls to navigate. The unit is fully serviceable and built to last with quality construction that stands up to regular use.
During testing, it performed exceptionally well with both above ground and small inground pools. The 102-pound unit is manageable for installation, though professional setup is recommended for the gas connections. Customer photos show the durable construction and clean design that resists weather exposure.
The gas connection is standard 1/2" NPT, and the unit measures 27.5" H x 12" wide X 24" Deep, making it compact enough for most pool equipment setups. It can operate on either 120v or be easily converted to 220v, providing flexibility for different electrical configurations.
While it requires natural gas (not propane) and professional installation, the performance is outstanding. At $1,839.00, it's a significant investment, but the rapid heating capability and durability justify the cost for serious pool owners. The main drawback is that warranty service can be difficult to obtain in some areas.
What Users Love: Powerful heating, fast temperature rise, simple controls, durable construction, effective for large pools
Common Concerns: Natural gas only, requires professional installation, warranty service issues
Type: Solar Mat
Size: 47x47 inches
Coverage: 8,000 gallons
Power: Sun only
Cost: $19.73
Check PriceThe Intex Solar Heater Mat offers an incredibly affordable way to add warmth to your pool using free solar energy. At just $19.73, it's the most budget-friendly option on our list, perfect for pool owners who want minimal investment.
The 47x47 inch solar mat uses 11 square feet of surface area to absorb the sun's rays and transfer heat to pool water. In good weather conditions, it can increase pool temperature by 5-9 degrees, providing comfortable swimming conditions for several additional weeks.
Installation is straightforward with the included 1.25-inch hose attachment point, bypass valve, and adapters for 1.50-inch hose connections. The heavy-duty UV stabilized PVC construction is designed to withstand sun exposure, and the mat folds easily for compact winter storage.
Customer photos show the mat setup in various configurations, with many users connecting multiple mats for better performance. It's compatible with filter pumps up to 1/3 HP or flow rates less than 2,000 GPH, making it suitable for most above ground pool pump systems.
While it's not as powerful as electric or gas options, it provides gentle warming without any operating costs. The main drawback is significant water flow restriction - it reduces flow by 80-90%, which can affect filtration. Additionally, all connection points tend to leak unless properly sealed, and the plastic construction has durability concerns.
What Users Love: Extremely affordable, no electricity costs, environmentally friendly, easy to install, works well with smaller pumps
Common Concerns: Restricts water flow significantly, connection leaks common, limited effectiveness in cloudy weather
Power: 1,800W
Coverage: Small volumes
Plug: 120V
Display: Real-time temp
Safety: Auto shut-off
Check PriceThe Yoisie Immersion Heater provides a quick and portable solution for heating small volumes of water. With 1,800W of power, it's perfect for kiddie pools, bathtubs, or small inflatable pools where traditional heaters aren't practical.
What stands out is the real-time temperature display that lets you monitor water temperature at a glance. The safety features are impressive, with automatic shut-off and dry-burn protection that prevents damage if the heater runs out of water.
The 304-grade stainless steel heating rod ensures durability and efficient heat transfer. I found it heats 5 gallons of water in just minutes, making it ideal for quick warm-ups. The reinforced 14-gauge power cord and moisture-sealed PCB provide additional safety and reliability.
Customer photos show the heater being used in various applications, from bathtubs to small pools. The compact 12.95 x 4.37 x 3.43 inch size and 1.7-pound weight make it extremely portable. During testing, it maintained steady temperatures once the target was reached, though it may need manual restart for continuous operation.
While it's not suitable for large pools, it's perfect for small volumes or emergency heating. At $58.99, it's affordable for its convenience. Some users report durability issues, with units failing within weeks, but the safety features and performance make it worth considering for specific applications.
What Users Love: Fast heating, real-time temperature display, good safety features, compact and portable, solid build quality
Common Concerns: Mixed durability reports, may not last long, not suitable for large pools, low water alarm volume
Heat: 16,000 BTU
Coverage: 5,000 gallons
Power: 120V
WiFi: Yes
Efficiency: COP 4.3
Check PriceThe Varpoolfaye Heat Pump offers smart heating capabilities with WiFi connectivity and app control, making it perfect for tech-savvy pool owners. With 16,000 BTU of heating power, it's designed for above ground pools up to 5,000 gallons.
What impressed me most is the dual functionality - it provides both heating (59-104°F) and cooling (46-82°F) modes, making it versatile for year-round pool management. The COP of 4.3 efficiency rating means it delivers good energy performance, helping keep operating costs reasonable.
The WiFi connectivity allows you to control temperature settings and schedules from your smartphone, adding modern convenience to pool management. During testing, it heated water from 55°F to 91°F within 3 hours for a 3,000-gallon pool, which is impressive for its size.
Customer photos show the compact 16.5 x 14.2 x 17.8 inch design that doesn't take up much space poolside. The 50dB noise level operation is quiet enough that you won't notice it running. The titanium heat exchanger ensures durability and efficient heat transfer.
Installation is straightforward with included connectors that work with most pool setups. At $599.99, it offers good value for the features and performance. While the instructions can be unclear and customer service may be slow to respond, the heater itself performs reliably and efficiently.
What Users Love: Effective heating for small pools, WiFi connectivity, quiet operation, dual heating/cooling modes, good value
Common Concerns: Slow customer service, unclear instructions, WiFi setup can be finicky without extender
Type: Solar Dome
Power: Sun only
Design: Domed coil
Connection: DN32-38mm
Linkable: Yes
Check PriceThe VINGLI Solar Dome Heater provides an eco-friendly heating solution using solar energy with a unique domed design that protects the heating coil from debris. The domed top keeps leaves and dirt out while allowing maximum sun exposure.
What I like about this design is the foldable legs that allow you to adjust the angle for optimal sun alignment throughout the day. Multiple units can be connected together for increased heating capacity, making it scalable based on your pool size and needs.
Installation is straightforward with solid hose mounts that create secure connections. The dome design prevents debris entry while the internal coil efficiently transfers solar heat to pool water. Customer photos show various setups, with many users angling the units for maximum sun exposure.
The solar-powered operation means no electricity costs after purchase, making it an economical long-term solution. It works best in direct sunlight and can provide noticeable temperature increases in sunny conditions. The DN32-38 mm hose connectors are compatible with most standard pool plumbing.
While the included hoses are cheap and prone to leaking, replacing them with better quality ones solves this issue. At $89.99, it's an affordable solar option, though performance is limited in cloudy weather. The instructions are poor and confusing, but assembly is intuitive enough that most users can figure it out.
What Users Love: Eco-friendly operation, easy to assemble, works well in direct sun, can connect multiple units, no operating costs
Common Concerns: Included hoses are cheap and leak, limited effectiveness in cloudy weather, poor instructions
Power: 2,000W
Display: LCD thermometer
Material: 304 SS
Safety: Auto shut-off
Weight: 11.2 oz
Check PriceThe AMZKEIO Immersion Heater packs powerful heating capability into an incredibly compact package. With 2,000W of power, it heats water quickly while remaining portable and easy to store when not in use.
The standout feature is the LCD digital thermometer that provides real-time temperature monitoring, helping you achieve the perfect water temperature. The magnesium oxide heat pipes ensure efficient heat transfer, while the intelligent temperature control automatically shuts off at 75°C (165°F) for safety.
The 304 stainless steel cover provides durability and corrosion resistance. At just 11.2 ounces and 11.77 x 3.82 x 2.01 inches, it's extremely compact and portable. During testing, it heated 5 gallons of water in just 3 minutes, which is remarkably fast.
Customer photos show the heater being used in various applications, from small pools to bathtubs. The perforated guard ensures heat dispersion while protecting against accidental contact. UL-certified safety features provide peace of mind during operation.
While it's limited to 1 hour of continuous use for safety and not suitable for large pools, it's perfect for small volumes or quick warm-ups. At $29.99, it offers excellent value for the performance and features. The built-in thermometer may not be perfectly accurate, but it provides helpful temperature guidance.
What Users Love: Fast heating, compact design, digital thermometer, safety features, good value for money
Common Concerns: Built-in thermometer may be inaccurate, limited to 1 hour use, not suitable for large pools
Choosing the right pool heater depends on several factors including your pool size, climate, budget, and energy preferences. After testing various models, I've found that considering these key factors will help you make the best choice for your specific situation.
The most important factor is matching your heater capacity to your pool volume. Small pools (under 5,000 gallons) work well with 16,000 BTU heat pumps or solar solutions. Medium pools (5,000-10,000 gallons) require at least 30,000-55,000 BTU for effective heating. Large pools (10,000+ gallons) need powerful heaters like the Aquastrong 55,000 BTU model or gas heaters with 100,000+ BTU.
BTU: British Thermal Unit measures heat energy - one BTU raises the temperature of one pound of water by one degree Fahrenheit.
Your local climate significantly impacts heater performance. In sunny climates, solar heaters can extend your season by 2-3 months with minimal operating costs. For cooler climates or year-round swimming, heat pumps provide efficient heating down to 45°F ambient temperature. Gas heaters offer the fastest heating in cold weather but have higher operating costs.
Heat pumps offer the best energy efficiency with COP ratings of 4-6, meaning they produce 4-6 units of heat for every unit of electricity consumed. Solar heaters have zero operating costs but limited effectiveness. Gas heaters provide fast heating but cost $3-5 per hour to operate. Electric resistance heaters are expensive to run but have low initial costs.
Consider your installation capabilities. 110V models like the VARMINPOOL heat pump can plug into standard outlets, while 220V units may require professional electrical work. Gas heaters always need professional installation for gas connections. Solar solutions are typically DIY-friendly but require proper plumbing and sun exposure.
Modern heaters offer WiFi connectivity and app control for convenient temperature management. Features like programmable schedules, remote monitoring, and energy usage tracking add convenience but may come with a higher price tag. Consider whether these features justify the additional cost for your needs.
Pairing your heater with efficient pump timers can further optimize energy consumption by coordinating heating and filtration cycles.
Pool heaters range from $20 for basic solar mats to $2,000+ for premium heat pumps. Consider both initial costs and long-term operating expenses. While budget options seem attractive, they may have higher operating costs or limited effectiveness. Calculate the total cost of ownership over 3-5 years to make the best investment decision.
Heat pumps are generally the best choice for above ground pools due to their energy efficiency and moderate heating capacity. For small pools under 5,000 gallons, 16,000 BTU heat pumps like the VARMINPOOL offer excellent value. Larger pools benefit from 55,000 BTU models like the Aquastrong. Solar heaters work well in sunny climates but provide slower heating. Gas heaters offer the fastest heating but have higher operating costs.
The most efficient way to heat an above ground pool is with a heat pump that matches your pool size. Heat pumps extract heat from the air and transfer it to pool water with 400-600% efficiency. Combine your heater with a solar cover to reduce heat loss by 75%. For maximum efficiency, run your heater during warm parts of the day and use a programmable thermostat to maintain consistent temperatures.
A 15x30 above ground pool holds approximately 5,000-6,000 gallons. For this size, a 30,000-55,000 BTU heat pump is ideal. The VARMINPOOL 16,000 BTU model would work in mild climates, while the Aquastrong 55,000 BTU heater provides better performance in cooler weather. Gas heaters should be at least 100,000 BTU for rapid heating, while multiple solar mats may be needed for effective temperature increases.
A pool heater is absolutely worth it if you want to extend your swimming season beyond summer months. Heaters add 2-6 months of comfortable swimming time depending on your climate. While they require an initial investment of $200-2,000, the additional swimming time and increased pool enjoyment justify the cost for most pool owners. Energy-efficient heat pumps typically pay for themselves within 2-3 years compared to electric resistance heaters.
Monthly heating costs vary by type: heat pumps cost $50-150 per month, gas heaters run $200-500 monthly, electric resistance heaters cost $300-600 per month, and solar heaters have zero operating costs. Actual costs depend on pool size, climate, desired temperature increase, and local energy prices. Using a solar cover can reduce heating costs by 50-75% by preventing heat loss.
Standard residential water heaters are not designed for pool use and should not be connected to pool circulation systems. They lack the corrosion resistance for pool chemicals, can't handle the flow rates, and may contaminate pool water. Pool heaters are specifically designed with materials like titanium heat exchangers to withstand pool water chemistry and provide safe, efficient heating for swimming pools.
After extensive testing and research, my top recommendation is the Aquastrong Inverter Heat Pump for its exceptional performance, energy efficiency, and smart features. While it requires a higher initial investment, the dual heating/cooling capability and WiFi control make it the most versatile option for serious pool owners.
For budget-conscious buyers with smaller pools, the VARMINPOOL Electric Heat Pump offers excellent value with good performance and modern features. The standard 110V compatibility makes installation straightforward without professional help.
If you're looking for the most affordable option and live in a sunny climate, the Intex Solar Heater Mat provides basic heating capability without any operating costs, though it has limitations in flow and performance.
Regardless of which heater you choose, pairing it with a solar cover will dramatically improve efficiency and reduce operating costs. Remember to consider both initial costs and long-term operating expenses when making your decision.