Best solar pool heaters
The best solar pool heater for an inground pool depends mostly on who installs it. If you want a contractor to design and fit the system, a dealer-installed line like Heliocol is the most thoroughly documented choice. If you’re comfortable with plumbing and roof work, you can buy panels or a kit and install them yourself. Our picks, chosen from manufacturers’ published information:
- Best overall: Heliocol HC collectors
- Best panels for a DIY system: FAFCO SunSaver
- Best for small or narrow roofs: SunGrabber In-Ground
We compare product lines rather than single kits, because an inground system is sized to your pool: you buy as many panels as your pool needs. Availability changes often, and some kits and parts are out of stock at retailers as we write this, so check with the manufacturer or a dealer before you plan around one.
Contents
- Our picks at a glance
- Best overall: Heliocol HC collectors
- Best panels for a DIY system: FAFCO SunSaver
- Best for small or narrow roofs: SunGrabber In-Ground
- How we chose
- How to choose a solar pool heater for an inground pool
- Frequently asked questions
Our picks at a glance
| Heliocol HC¹ | FAFCO SunSaver² | SunGrabber In-Ground³ | |
|---|---|---|---|
| Best for | Professional installation | DIY systems built from panels | Small or narrow roof areas |
| Panel sizes | 4 × 8 ft to 4 × 12.5 ft (nominal) | 4 × 6 ft to 4 × 12 ft; some 2 ft wide | 2 ft wide; 10, 12 or 20 ft long |
| Header size | 2 in | 2 in | 1.5 in |
| How it’s sold | Through dealers | Direct, as separate panels and kits | Through dealers and retailers |
| Warranty | 12-year limited, including freeze protection | Not stated on the seller’s pages | 10-year limited; freeze damage not covered |
Sources: ¹ Magen eco-Energy’s Heliocol page and 2025 brochure. ² FAFCO’s SunSaver panel listings. ³ SunGrabber In-Ground installation and operation manual. All checked October 28, 2026.
Best overall: Heliocol HC collectors
Heliocol, now made by Magen eco-Energy, is the best-documented solar pool heater line we found. Its HC collectors come in four sizes, from the HC-30 (nominally 4 × 8 ft) to the HC-50 (4 × 12.5 ft). Each one is built from individual round tubes joined to a one-piece overmolded header, and they mount with clamps that the manufacturer says need fewer roof penetrations than strapped systems. The open tube design is meant to resist lifting in high winds and let the roof underneath dry out.
Heliocol was one of the first two systems certified under the Solar Rating and Certification Corporation’s pool heating standard, and the manufacturer publishes rated output for each model. Systems are sold and installed through Heliocol dealers, so you’ll get a design sized for your pool, roof and climate rather than a box off the shelf.
Pros
- Detailed published specs and certified output ratings.
- 12-year limited warranty, which the manufacturer says includes freeze protection.
- Clamp mounting and an open tube design built for roofs and wind.
Cons
- Sold through dealers only, so not a DIY option.
- You’ll need a local dealer, and coverage varies by area.
Best panels for a DIY system: FAFCO SunSaver
FAFCO sells its SunSaver solar pool heating panels directly through its own online store. There are two designs: Connected Tube (CT) panels in 4 ft widths, from 4 × 6 ft to 4 × 12 ft, and Separated Tube (ST) panels in 4 ft widths plus 2 ft widths for tight spots. All the panels we found have 2 in headers. FAFCO also sells the system, panel and spacer kits used to put an inground system together.
SunSaver suits a pool owner who wants to plan the layout and install the system themselves, buying the number and size of panels their pool needs. The trade-off is that the seller’s pages give little beyond sizes. They don’t list materials or warranty terms, and some sizes and kits show as sold out, so contact FAFCO before you buy.
Pros
- Many panel sizes, including 2 ft wide panels for awkward roof sections.
- Bought directly from the manufacturer’s store.
- Two panel designs to choose from.
Cons
- The seller’s pages don’t state warranty terms or materials.
- Some panels and kits are sold out at times.
- You design and install the system yourself.
Best for small or narrow roofs: SunGrabber In-Ground
SunGrabber’s inground panels are 2 ft wide, which makes it easier to fit a system onto a smaller or broken-up roof. They come 20 ft long for horizontal installs, or 10 ft and 12 ft long for vertical ones, and a system can have up to 12 panels. Water enters through a header with metering holes that spread it evenly across the panel tubes, according to the manual. The base packages include the panels and mounting hardware. A separate system kit adds the valves, and the panels drain through a vacuum relief valve when the pump stops.
The manual says a 3/4 to 1 1/2 horsepower pump will generally handle a system up to 30 ft from the pool equipment and one story high. Bigger or farther installs may need a larger pump.
Pros
- Narrow 2 ft panels in three lengths fit more roof layouts.
- Clear installation and winterizing manual.
- 10-year limited warranty.
Cons
- The system kit with the valves is sold separately.
- Freeze damage isn’t covered by the warranty, so you must drain the system before a freeze.
- Several SunGrabber parts and add-on panels are out of stock at retailers as we write this.
How we chose
We started from the solar pool heater lines sold for inground pools in the U.S. and kept only those whose manufacturer publishes enough to describe them accurately: panel sizes, how the system goes together, and warranty terms where given. Our sources were manufacturer websites, brochures and installation manuals, checked October 28, 2026. We haven’t tested these systems ourselves, and we don’t list prices because they change often.
We left out kits we couldn’t verify from the manufacturer, and kits that retailers list as discontinued. One other line, Techno-Solis Swimmaster, was certified under the same pool heating standard at the same time as Heliocol, so it’s worth asking about if a local dealer carries it.
How to choose a solar pool heater for an inground pool
- Size it to your pool. The U.S. Department of Energy’s rule of thumb is collector area equal to 50% to 100% of your pool’s surface area, more in cooler or cloudier places. Our solar pool heater guide walks through the math.
- Decide who installs it. Dealer-installed systems include the design work. DIY panels cost you time and roof work, and the manufacturer’s manual sets the rules for mounting, plumbing and drainage.
- Check the roof space. Count the unshaded, south-facing area you have. Narrow panels can fill gaps that 4 ft wide panels can’t.
- Check your pump. Roof-mounted collectors may need more pump power than you have now.
- Read the warranty. Look at the length, what it covers, and whether freeze damage is included.
Frequently asked questions
What is the best solar pool heater for an inground pool?
For most inground pools, a professionally installed system from an established line such as Heliocol is the safest choice, because the dealer sizes and installs it for your pool and roof. If you’d rather install it yourself, FAFCO SunSaver panels and SunGrabber kits are both built for inground systems.
How many solar panels do I need to heat an inground pool?
Enough to cover 50% to 100% of your pool’s surface area, according to the U.S. Department of Energy. A 16 × 32 ft pool, for example, has 512 sq ft of surface, so it needs roughly 256 to 512 sq ft of collector. Divide that by the area of the panel you choose to get a panel count.
Are solar pool heater kits worth it?
They can be, if you have the roof space and the skills to install one safely. The Department of Energy says solar pool heaters have very low running costs and usually last longer than gas or heat pump heaters. If your roof is steep or high, or you aren’t comfortable with plumbing, a dealer-installed system is the better route.