By Ethan BrooksUpdated November 2026
Shopping for a thermax solar pool heater means matching panel size, flow rate and plumbing to your pool and pump, not just picking the largest panel on the shelf. The picks below are ranked by how well they fit common residential setups: above-ground and inground pools, small and large volumes, and circulation rates that a typical single-speed or variable-speed pump can actually deliver. Each product was assessed against four criteria: the specifications stated by the manufacturer, the brand’s reputation for solar pool equipment, patterns in owner feedback about leaks and fittings, and how clearly the product matches a specific use case. This is a research-based comparison, not hands-on testing.
Our top picks at a glance
- 1
TOP CHOICEBest overallNorthern Lights Group Solar Pool Heater – Thermax Solar Pool Heating PView on Amazon - 2
TOP CHOICEBest for small above-ground poolsVINGLI Solar Pool Heater Above Ground Domed Solar Powered Swimming PooView on Amazon - 3
TOP CHOICEBest for easy setupGoplus Solar Pool Heater Above Ground, Inground Swimming Pool Dorm HeaView on Amazon - 4
Best for mid-size inground poolsGoplus 2.5FT x 10FT/ 20FT Solar Pool Heater for Above Ground Pool IngrView on Amazon - 5
Best for Intex pools28685E – Energy-Efficient Heating – Designed to work with INTEX FilterView on Amazon - 6
Best for long runs and large surfacesVINGLI 2.4FT x 20FT Solar Pool Heater Panel, Weatherproof High-EfficieView on Amazon - 7
Best for year-round or fast heatingRaypak Crosswind 40i 33,000BTU Electric Swimming Pool Heat Pump HeaterView on Amazon
Our Top Picks
Quick Comparison
| Product | Best for | Key feature |
|---|---|---|
| Northern Lights Group Solar Pool Heater Thermax Panels | Balanced all-round use | Thermax branding with a 2m x 1m panel format |
| VINGLI Solar Pool Heater Domed Contour Coil | Small above-ground pools | Compact contour coil for limited space |
| Goplus Solar Pool Heater Above Ground, Inground | Easy installation | Rotatable hose connectors and foldable legs |
| Goplus 2.5FT x 10FT Solar Pool Heater | Mid-size inground pools | 10 ft length option for moderate volumes |
| Intex-compatible Solar Pool Water Heater Mat (2 Pack) | Intex above-ground pools | Sized for Intex filter pumps up to 2,000 GPH |
| VINGLI 2.4FT x 20FT Solar Pool Heater Panel | Large surface area | 20 ft panel length for bigger pools |
| Raypak Crosswind 40i Heat Pump Heater | Faster or year-round heating | Inverter heat pump with WiFi control |
Northern Lights Group Solar Pool Heater – Thermax Solar Pool Heating Panels – Thermax Solar Pool Heater 2m x 1m – High Performance Solar Water Heater
Northern Lights Group Solar Pool Heater – Thermax Solar Pool Heating Panels – Thermax Solar Pool Heater 2m x 1m – High Performance Solar Water Heater
Best for: Balanced all-round use with a standard thermax panel format
This suits owners who want a conventional flat panel sized around a 2 m by 1 m footprint and who have a roof or ground area to mount it. It is a reasonable starting point for moderate pool volumes when paired with an appropriate circulation pump.
Key specs:
- Panel size: 2 m x 1 m (per listing name)
- Application: solar pool heating and solar water heating
Pros:
- Clear panel dimensions stated in the listing
- Standard format that is easy to plan around
- Suitable for both pool and general solar water use
Cons:
- Output depends heavily on flow rate, which you must supply
- Requires a separate plumbing layout and diverter valve
Bottom line: A good first choice for owners who want a straightforward flat panel and are comfortable working out flow and plumbing.
VINGLI Solar Pool Heater Above Ground Domed Solar Powered Swimming Pool Heater Contour Pool Heating Coil (1 Pack)
VINGLI Solar Pool Heater Above Ground Domed Solar Powered Swimming Pool Heater Contour Pool Heating Coil (1 Pack)
Best for: Small above-ground pools with limited space
A domed contour coil is designed to sit on or beside a small pool and heat water as it passes through. It fits owners with limited mounting space who do not want a large roof-style array.
Key specs:
- Format: single-pack domed contour pool heating coil
- Intended use: above-ground pool water heating
Pros:
- Compact footprint
- Simple concept with few parts
- Works without roof mounting
Cons:
- Limited heating capacity for larger volumes
- Performance drops in cool or overcast weather
Bottom line: Best for small above-ground setups where space is the main constraint.
Goplus Solar Pool Heater Above Ground, Inground Swimming Pool Dorm Heater with Rotatable Hose Connectors and Foldable Legs, Solar Powered Water Heating
Goplus Solar Pool Heater Above Ground, Inground Swimming Pool Dorm Heater with Rotatable Hose Connectors and Foldable Legs, Solar Powered Water Heating
Best for: Easy setup and repositioning
Owners who move equipment seasonally or want quick hose connections will value the rotatable connectors and folding legs. It suits both above-ground and inground pools with modest volumes.
Key specs:
- Features: rotatable hose connectors, foldable legs
- Compatibility: above-ground and inground pools
Pros:
- Rotatable connectors ease hose routing
- Foldable legs simplify storage
- Works with both pool types
Cons:
- Heating rate is modest for large pools
- Legs may need reinforcement on uneven ground
Bottom line: A practical choice for owners who value easy setup and seasonal removal.
Goplus 2.5FT x 10FT/ 20FT Solar Pool Heater for Above Ground Pool Inground Pools, Swimming Pool Solar Panel Heating System, Weatherproof Pool Warmer (2.5FT x 10FT)
Goplus 2.5FT x 10FT/ 20FT Solar Pool Heater for Above Ground Pool Inground Pools, Swimming Pool Solar Panel Heating System, Weatherproof Pool Warmer (2.5FT x 10FT)
Best for: Mid-size inground pools
The 10 ft length option gives more collector area than compact coils, making it suitable for moderate inground volumes when flow is well matched.
Key specs:
- Panel size: 2.5 ft x 10 ft (per listing name)
- Weatherproof construction for outdoor use
Pros:
- Clear length options in the listing
- More collector area than compact designs
- Suits inground and above-ground pools
Cons:
- Requires careful flow balancing to avoid under-heating
- Mounting layout needs planning
Bottom line: A solid middle-ground pick for owners with a moderate inground pool.
28685E – Energy-Efficient Heating – Designed to work with INTEX Filter Pumps up to 2,000 GPH, 47.25″ x 47.25″ INTEX Solar Pool Water Heater Mat for Above Ground Swimming Pools, 2 Pack
28685E – Energy-Efficient Heating – Designed to work with INTEX Filter Pumps up to 2,000 GPH, 47.25" x 47.25" INTEX Solar Pool Water Heater Mat for Above Ground Swimming Pools, 2 Pack
Best for: Intex above-ground pools
Owners with Intex pools and matching filter pumps will find the mat format straightforward. It lays flat on the pool surface or nearby ground and is sized to the flow ranges stated in the listing.
Key specs:
- Dimensions: 47.25 in x 47.25 in per mat
- Stated compatibility: Intex filter pumps up to 2,000 GPH
- Quantity: 2 pack
Pros:
- Flow compatibility stated clearly
- Two-pack gives extra coverage
- Simple connection to existing pump lines
Cons:
- Limited to smaller pool volumes
- Owners often report that mats need regular cleaning
Bottom line: Best for Intex owners who want a compatible, easy-to-connect mat.
VINGLI 2.4FT x 20FT Solar Pool Heater Panel, Weatherproof High-Efficiency Swimming Pool Heating System, Solar Pool Warmer for Above Ground & Inground Pools
VINGLI 2.4FT x 20FT Solar Pool Heater Panel, Weatherproof High-Efficiency Swimming Pool Heating System, Solar Pool Warmer for Above Ground & Inground Pools
Best for: Large surface area and long runs
The 20 ft length provides substantial collector area for bigger pools. It suits owners with ample sun exposure and a pump capable of pushing water through a longer manifold.
Key specs:
- Panel size: 2.4 ft x 20 ft (per listing name)
- Weatherproof, for above-ground and inground use
Pros:
- Large collector area for bigger pools
- Works with both pool types
- Weatherproof construction
Cons:
- Long manifolds increase pressure drop, which may need a stronger pump
- Takes significant mounting space
Bottom line: Suited to larger pools with good sun and a pump that can handle the added head loss.
Raypak Crosswind 40i 33,000BTU Electric Swimming Pool Heat Pump Heater, 208/230V Hard Wired Inverter Technology, WiFi, Above Ground & In Ground Pool and spa Heater and Chiller, 9000 Gallon, Heat Cool
Raypak Crosswind 40i 33,000BTU Electric Swimming Pool Heat Pump Heater, 208/230V Hard Wired Inverter Technology, WiFi, Above Ground & In Ground Pool and spa Heater and Chiller, 9000 Gallon, Heat Cool
Best for: Faster or year-round heating
This is an electric heat pump rather than a solar collector. It suits owners who need predictable heating in cool months or want to heat a 9,000-gallon pool quickly, and who have a 208/230 V electrical supply available.
Key specs:
- Rated capacity: 33,000 BTU (per listing name)
- Pool volume rating: 9,000 gallons (per listing name)
- Voltage: 208/230 V hard-wired; WiFi control
Pros:
- Heats and cools on demand
- WiFi control for scheduling
- Inverter technology for variable output
Cons:
- Requires electrical running costs and a qualified electrician for hard-wiring
- Not a solar device, so it does not fit a purely solar-powered goal
Bottom line: Choose this if you need reliable year-round or fast heating and accept electric operation. Consult a licensed electrician before installation.
Buying Guide
Panel size and pool volume
Match collector area to pool volume and climate. As a rough planning rule, many installers size solar collector area to roughly 50 to 100 percent of pool surface area, adjusted for local sun. Check the panel dimensions in each listing against your pool.
Good picks for this: Goplus 2.5FT x 10FT Solar Pool Heater, VINGLI 2.4FT x 20FT Solar Pool Heater Panel
Flow rate and pump compatibility
Solar output depends on how much water reaches the panels. Many manufacturers specify a recommended flow range. Confirm your pump can deliver that flow after accounting for head loss through the panel and piping.
Good picks for this: 28685E Intex-compatible mat, Northern Lights Group Solar Pool Heater Thermax Panels
Head height and plumbing layout
Measure the vertical lift from pump to roof or mounting point. More head means lower flow and reduced heating. Use a diverter valve so you can bypass the panels when the water is already warm, and include a vacuum breaker where the layout calls for it.
Good picks for this: Northern Lights Group Solar Pool Heater Thermax Panels, VINGLI Solar Pool Heater Domed Contour Coil
Installation style and mounting
Decide between roof, ground or pool-side mounting. Ground mounts are easier to service but need sunny, level space. Roof mounts free up yard area but need structural and access checks.
Good picks for this: Goplus Solar Pool Heater with Rotatable Connectors, Goplus 2.5FT x 10FT Solar Pool Heater
Weather resistance and durability
Look for weatherproof construction and UV-stable materials. Owners often report that exposed fittings and connections are the first points to degrade, so check connector material and seal design.
Good picks for this: VINGLI Solar Pool Heater Domed Contour Coil, VINGLI 2.4FT x 20FT Solar Pool Heater Panel
Use case: solar only or hybrid heating
Solar-only systems are inexpensive to run but weather-dependent. If you need heat in cool months or on demand, a heat pump may suit better. Decide before choosing so you do not overbuy or underbuy.
Good picks for this: Raypak Crosswind 40i Heat Pump Heater, Goplus Solar Pool Heater Above Ground, Inground
Care and maintenance
Plan for periodic cleaning of panels, checking valves and winterizing where freezing occurs. Drain or bypass panels in freezing weather unless the product is rated for it.
Good picks for this: 28685E Intex-compatible mat, Goplus Solar Pool Heater with Rotatable Connectors
FAQ
How do I know what size thermax solar pool heater I need?
Start with pool surface area and local sun exposure, then check the panel dimensions and manufacturer flow recommendations. Many owners size collector area to a fraction of pool surface area and adjust after seeing winter performance. A licensed pool contractor can run a more precise calculation.
Does a solar pool heater work without a pump?
No. Water must circulate through the panels, so a pump is required. The pump must also deliver the flow the panels need after head loss is included.
Can I use a thermax solar pool heater on an above-ground pool?
Yes, many models are labeled for above-ground and inground use. Check the listing for compatibility and confirm your filter pump can supply the required flow.
Why is my pool not heating well?
Common causes include low flow, long or high-head plumbing, cloud cover, a missing vacuum breaker, or a pool cover left off overnight. Verify flow first, since it is the most frequent limiting factor.
Do I need a diverter valve?
A diverter valve lets you bypass the panels when you do not want solar heating, such as in hot weather or when you are running a chemical treatment. It is a useful addition to most solar layouts.
Is a heat pump better than solar for pools?
Neither is universally better. Heat pumps heat on demand and work in cooler weather but use electricity. Solar is low-running-cost but depends on sunshine. Many owners choose based on climate and how fast they need warmth.
Conclusion
For most owners, the Northern Lights Group thermax panel is a balanced starting point, while the VINGLI domed coil suits small above-ground pools and the Intex-compatible mat suits Intex owners. Larger inground pools are better matched to the 10 ft and 20 ft Goplus and VINGLI panels, provided your pump can handle the flow. If you need heat on demand or in cool months, the Raypak heat pump is the right category, though it is electric rather than solar. Verify flow, head height and electrical requirements before buying.
Sources
- Background on solar water heating principles and system design (energy.gov)
- Research on solar thermal performance and collector sizing (nrel.gov)
- Pool and spa safety guidance for consumers (cpsc.gov)
Related reading
- Xtremepowerus Solar Pool Heater: Setup, Sizing and Common Mistakes
- What Is a Solar Pool Heater Vacuum Breaker and Why Does It Matter?
- Top 7 Swimming Pool Solar Water Heater Options Compared (2026)
- Top 7 Solar Pool Heaters for Inground Pool Options Compared (2026)
- Top 5 Solar Water Pool Heater Options Compared for 2026
About Ethan Brooks
Ethan Brooks is part of our editorial team and reviews and edits our solar water systems guides, checking product details against manufacturer specifications and owner feedback.
