9 Best Solar Covers for Your 18-Foot Round Pool (Sun, Heat, and Savings)
Solar cover shopping can feel like a yawn, but skipping it means watching your pool lose heat every single night. An 18-foot round pool deserves a tailored solution, and nine top options actually deliver sun, warmth, and savings without the hassle—but not all thicknesses fit your needs equally.
| VEVOR 18 ft Round Solar Pool Cover |  | Best Heavy-Duty Option | Thickness: 12 mil | Material: Polyethylene (PE) | Evaporation Reduction: Up to 95% | VIEW LATEST PRICE | Read Our Analysis |
| Bestway Round 17ft 3in Solar Pool Cover for Above Ground Pool Cover Only |  | Best Value | Thickness: Not specified (0.25 in overall) | Material: Polypropylene (PP) | Evaporation Reduction: Not specified | VIEW LATEST PRICE | Read Our Analysis |
| BigXwell Heavy-Duty Solar Pool Cover 18ft Round – 16Mil Blue |  | Thickest Material | Thickness: 16 mil | Material: Polyethylene (PE) | Evaporation Reduction: Up to 95% | VIEW LATEST PRICE | Read Our Analysis |
| BigXwell 12Mil Round Solar Pool Cover (18 FT) |  | Lightweight Budget Pick | Thickness: 12 mil | Material: Polyethylene (PE) | Evaporation Reduction: Not specified (significant reduction) | VIEW LATEST PRICE | Read Our Analysis |
| In The Swim 18′ Premium Blue Round Solar Pool Cover 12 Mil |  | Best Warranty | Thickness: 12 mil | Material: Polyethylene (PE) | Evaporation Reduction: Not specified (minimizes evaporation) | VIEW LATEST PRICE | Read Our Analysis |
| UIRWAY 18ft Round Solar Pool Cover |  | Most Versatile | Thickness: Not specified (thickened bubble material) | Material: Polyethylene (heavy-duty PE) | Evaporation Reduction: Up to 95% | VIEW LATEST PRICE | Read Our Analysis |
| In The Swim 18′ Standard Blue Round Solar Pool Cover 8 Mil | | Budget-Friendly Choice | Thickness: 8 mil | Material: Polyethylene (PE) | Evaporation Reduction: Minimizes evaporation | VIEW LATEST PRICE | Read Our Analysis |
| VEVOR Solar Pool Cover 18 ft 16 Mil Round Solar Blanket Blue |  | Best Overall | Thickness: 16 mil | Material: Polyethylene (PE) | Evaporation Reduction: Up to 95% | VIEW LATEST PRICE | Read Our Analysis |
| Blue Wave 18-Ft Round Solar Pool Cover |  | Standard Performance | Thickness: 8 mil | Material: Polyethylene (thermal bubble material) | Evaporation Reduction: Reduces evaporation | VIEW LATEST PRICE | Read Our Analysis |
More Details on Our Top Picks
VEVOR 18 ft Round Solar Pool Cover
You’re after heavy duty performance without the heavy lifting? The VEVOR 18 ft Solar Pool Cover delivers just that, wrapping your round pool in a 12-mil PE bubble that’s tough yet flexible. You’ll trim it for odd shapes, and it stays put, cutting evaporation by up to 95%. That means warmer water, lower energy bills, and fewer chemicals to chase.
And here’s the kicker: the micro-bubble surface does double duty. By day, it absorbs solar rays; by night, it locks in heat, stretching your swim season without stretching your budget.
- Easy install: unroll, trim, and let it work
- Durable build: resists tears and stretching
- Low maintenance: keeps leaves and debris out
Weighing just 14.1 pounds, it’s a breeze to handle. Just don’t expect it to stay clean—you’ll still need to skim!
- Thickness:12 mil
- Material:Polyethylene (PE)
- Evaporation Reduction:Up to 95%
- Weight:14.1 lbs
- Warranty Length:30-day return + manufacturer warranty
- Custom Trim Capability:Yes (easy trimming)
- Additional Feature:12-mil bubble design
- Additional Feature:Reduces evaporation by 95%
- Additional Feature:Suitable for irregular shapes
Bestway Round 17ft 3in Solar Pool Cover for Above Ground Pool Cover Only
If your 18-foot pool matches Bestway’s frame lineup, this cover earns its keep. You’ll float this 17 ft. 3 in. polypropylene rectangle directly on the water’s surface. It creates a greenhouse effect, trapping solar heat to warm your pool during sunny days. Plus, it reduces overnight heat loss, so you swim longer. Here’s what else it does:
- Blocks leaves, dirt, and debris from entering your water.
- Cuts down chemical use by limiting exposure.
- Minimizes cleaning time.
- Thickness:Not specified (0.25 in overall)
- Material:Polypropylene (PP)
- Evaporation Reduction:Not specified
- Weight:Not specified
- Warranty Length:30-day return + manufacturer warranty
- Custom Trim Capability:Not specified
- Additional Feature:0.25-inch thickness
- Additional Feature:Fits Bestway 18-ft pools
- Additional Feature:Floating installation type
BigXwell Heavy-Duty Solar Pool Cover 18ft Round – 16Mil Blue
Need the thickest material for your 18-foot round pool? You’ll want to look at the BigXwell Heavy-Duty Solar Pool Cover. It’s built from durable 16-mil polyethylene, so it stands up to harsh weather without a problem. Those thousands of thermal bubbles trap heat efficiently, keeping your water warm even on cloudy days or chilly nights. And it cuts evaporation by up to 95%, saving you water and refills.
Here’s what you get:
- Round shape fits 18-ft pools (in-ground or above-ground)
- Lightweight design, just float it on the surface
- Scissors make it easy to trim for a custom fit
- Blocks debris, maintaining water clarity
It’s simple to use: float it on, remove it when you’re swimming, and store it with minimal care. Plus, you’ve got Amazon’s 30-day return policy backing your purchase.
- Thickness:16 mil
- Material:Polyethylene (PE)
- Evaporation Reduction:Up to 95%
- Weight:Not specified
- Warranty Length:30-day return + manufacturer warranty
- Custom Trim Capability:Yes (trim with scissors)
- Additional Feature:16-mil thermal bubble thickness
- Additional Feature:95% evaporation reduction
- Additional Feature:Trim-to-fit with scissors
BigXwell 12Mil Round Solar Pool Cover (18 FT)
Here’s what you gain:
- Heat retention: Warms water and holds temperature overnight.
- Debris protection: Blocks leaves, dust, and critters.
- Easy handling: Weighs roughly 19 pounds, so you’ll install and remove it in minutes.
Hand wash it, store it dry, and enjoy the extra swim time.
- Thickness:12 mil
- Material:Polyethylene (PE)
- Evaporation Reduction:Not specified (significant reduction)
- Weight:18.9 lbs (8.57 kg)
- Warranty Length:30-day return + manufacturer warranty
- Custom Trim Capability:Not specified
- Additional Feature:Pull-on closure for securing
- Additional Feature:Hand wash recommended
- Additional Feature:Store in cool/dry place
In The Swim 18′ Premium Blue Round Solar Pool Cover 12 Mil
You want a solar cover that won’t quit on you after just one season. The In The Swim 18′ Premium Blue Round cover delivers that with its 12-mil polyethylene build, a cut above thinner alternatives. It’s not just tough; it’s smart. This cover captures sunlight to warm your pool naturally, then holds that heat overnight, stretching your swim season without hiking your energy bill. It also slashes evaporation, so you’ll top off less water and use fewer chemicals. Weighing about 16 pounds, it’s manageable, and you can trim it with scissors to fit ladders or steps. Plus, the 7-year warranty backs that durability. A solid, long-term investment.
- Thickness:12 mil
- Material:Polyethylene (PE)
- Evaporation Reduction:Not specified (minimizes evaporation)
- Weight:16 lbs
- Warranty Length:7-year manufacturer warranty
- Custom Trim Capability:Yes (trim with scissors)
- Additional Feature:7-year manufacturer warranty
- Additional Feature:Foldable with buckle closure
- Additional Feature:UV protection included
UIRWAY 18ft Round Solar Pool Cover
The UIRWAY 18ft Round Solar Pool Cover is most versatile if you want a lightweight option that still delivers serious heat retention. You’ll appreciate its advanced thermal bubble material: it soaks up solar energy all day and holds that warmth overnight, stabilizing your water temperature. Don’t expect a safety cover, though. It won’t support weight. But for extending your swim season from early spring to late fall? This cover shines. It also slashes water evaporation by 95% and blocks leaves and dirt. You can trim it around ladders, too. Easy installation by one or two people rounds out the deal.
- Thickness:Not specified (thickened bubble material)
- Material:Polyethylene (heavy-duty PE)
- Evaporation Reduction:Up to 95%
- Weight:Not specified (lightweight)
- Warranty Length:Manufacturer warranty (not specified)
- Custom Trim Capability:Yes (trim for custom fit)
- Additional Feature:Not a safety cover
- Additional Feature:Blocks leaves/dust/UV rays
- Additional Feature:Hand wash and air dry
In The Swim 18′ Standard Blue Round Solar Pool Cover 8 Mil
For budget conscious pool owners, the In The Swim 18′ Standard Blue Round Solar Pool Cover 8 Mil is a smart, affordable choice. You’ll get a lightweight 8 mil polyethylene cover that heats water and cuts evaporation. It fits 18-foot round pools, trims to fit around steps, and includes a reel for easy handling.
Here’s what you gain: warmer water overnight without extra energy, less evaporation saving water and chemicals, and easy care with chlorine below 2.5 ppm and pH above 7.2.
With 3-year warranty and 4.3 stars from 986 reviews, it’s reliable. Store in shade; you’ll extend your swim season cheaply!
- Thickness:8 mil
- Material:Polyethylene (PE)
- Evaporation Reduction:Minimizes evaporation
- Weight:13 lbs
- Warranty Length:3-year manufacturer warranty
- Custom Trim Capability:Yes (cut-to-fit)
- Additional Feature:Includes reel for handling
- Additional Feature:3-year manufacturer warranty
- Additional Feature:Trim-to-fit around features
VEVOR Solar Pool Cover 18 ft 16 Mil Round Solar Blanket Blue
If your 18-foot round pool spends more time losing heat than keeping it, this VEVOR blanket deserves a closer look. You get a thick 16-mil design with micro-bubbles that actively absorb sunlight during the day and lock in warmth overnight. It slashes water evaporation by up to 95%, so you’re refilling less and cutting chemical loss too. The durable polyethylene resists tearing and cracking from sun exposure, though you’ll want to avoid highly acidic conditions. Lightweight at 19 pounds, you can trim it to fit irregular shapes. Easy manual setup gets you swimming longer, with less maintenance.
- Thickness:16 mil
- Material:Polyethylene (PE)
- Evaporation Reduction:Up to 95%
- Weight:19 lbs
- Warranty Length:30-day return + manufacturer warranty
- Custom Trim Capability:Yes (trim to fit)
- Additional Feature:16-mil bubble design
- Additional Feature:Resists cracking/aging
- Additional Feature:Avoid acidic/chlorinated conditions
Blue Wave 18-Ft Round Solar Pool Cover
When standard performance is your priority, grab the Blue Wave 18-ft round solar pool cover. Its 8-mil thickness keeps it lightweight for easy handling, while thousands of downward facing thermal bubbles capture solar energy and transfer heat into your water. You’ll reduce evaporation and keep debris out, cutting down on maintenance.
Here’s what you get:
- Durable, tear resistant material backed by 33 years of experience
- A 3 year limited warranty for peace of mind
- Easy trimming with scissors to fit around ladders
Store it dry and in the shade to maximize its lifespan.
- Thickness:8 mil
- Material:Polyethylene (thermal bubble material)
- Evaporation Reduction:Reduces evaporation
- Weight:Not specified (lightweight)
- Warranty Length:3-year limited warranty
- Custom Trim Capability:Yes (trim with scissors)
- Additional Feature:8-mil lightweight thickness
- Additional Feature:3-year limited warranty
- Additional Feature:Roll for dry shade storage
Factors to Consider When Choosing Solar Covers for 18 Ft Round Pool
You’ll want to start with material thickness, as thicker covers generally offer better heat retention and durability. Heat retention efficiency isn’t just about thickness, though, it also depends on the quality of the solar bubbles and how well the cover seals against evaporation. And don’t forget about pool shape compatibility, tear resistance, and water evaporation reduction, all of which directly impact how well your 18-foot round cover performs over time.
Material Thickness Options
How thick should your solar cover be for that 18-foot round pool? You’ve got a few solid options, and it’s all about what you prioritize. Thicker covers, like 16-mil or 12-mil, bring better insulation and seriously cut water evaporation, sometimes up to 95%. That means less top-offs and more time swimming warm. But they’re heavier to wrestle on and off. Thinner 8-mil covers are lighter, easier to handle, and still work, but they’re less durable and won’t hold heat as well. Your choice boils down to balancing ease of use with long-term durability. For extended seasonal use, thicker covers win hands down. Quick weigh your options:
- 16-mil: Maximum heat, evaporation reduction, and longevity.
- 12-mil: Great balance of performance and manageability.
- 8-mil: Light and affordable, but shorter lifespan.
Pick what fits your pool routine best!
Heat Retention Efficiency
Since heat retention is the whole point of buying a solar cover in the first place, let’s zero in on what actually makes a cover good at it. Thickness matters big time; you’ll want 12 mil or thicker for serious insulation. Thinner covers might save money upfront, but they’ll bleed warmth overnight, costing you more in the long run.
Look for thermal bubbles, not just flat sheets. Those air pockets trap heat like a snug blanket on your pool. And don’t overlook the material’s reflective side; a shiny top layer bounces sunlight down, while the underside locks in what you’ve already gained.
Finally, make sure it covers every inch of water surface. Any exposed gap is a heat escape route. A perfectly fitted cover cuts nighttime loss dramatically, keeping your swim season stretched well into autumn. That’s the efficiency you’re paying for.
Pool Shape Compatibility
Two key factors make shape compatibility essential for your 18-foot round pool. First, you need a cover designed specifically for that exact diameter. A size that’s slightly larger, say 19 feet, ensures complete coverage and better heat retention. Second, your cover must match your pool’s outline. If yours has irregular features, like semi-rectangular edges, confirm the cover accommodates them without gaps.
Look for a round cover you can trim or customize around ladders and skimmers. This won’t compromise effectiveness if you do it carefully. And remember, some covers work for both above-ground and in-ground pools, which can affect shape and fit. So measure twice and match the shape right. You’ll keep every inch of water warm without worrying about shifting or sagging!
Tear And Stretch Resistance
Once your cover fits like a glove, the next thing you’ll want to think about is how well it holds up when the wind whips, branches scrape, or you’re wrestling it on and off for the fifth time this week. Tear and stretch resistance isn’t a luxury; it’s what keeps your cover from turning into a saggy, useless tarp. Look for covers with thicker bubble designs and high-quality polyethylene materials. They’ll shrug off snags and keep their shape season after season. Reinforced seams and durable edge construction matter too, preventing splitting when you trim or install. Without that stretch resistance, your cover can deform, losing its snug fit and effectiveness. You want a cover that fights back against wear, so you’re not replacing it every year. That’s where you get real long term value.
Water Evaporation Reduction
Wondering how much water you’re losing to the sun and wind every day in your 18 foot round pool? It’s probably more than you think. A solar cover can slash that evaporation by up to 95%, acting like a shield. That micro-bubble surface slows water loss dramatically, so you’re not constantly refilling. Less evaporation also means your chemicals stay put, working harder for you.
Here’s the breakdown of why this matters:
- Stops wind and sun from stealing your water.
- Maintains stable water levels week after week.
- Fitting is key: a snug cover limits environmental exposure.
You’ll save money on water bills and chemical treatments, all from one simple layer. Use it daily during swim season, and you’ll notice the difference fast. That’s real, measurable savings, no exaggeration.
Chemical Conservation Benefits
Since you’re already cutting water loss dramatically, you’ll love what happens next for your chemical budget. Less evaporation means fewer top offs, so you’re not constantly adding fresh water that throws your chemical balance out of whack. That stability keeps your chlorine and other treatments working longer, reducing how often you need to shock or adjust.
Your cover also acts as a physical shield, blocking debris and organic matter from entering the pool. With fewer contaminants, you’ll face less demand on your sanitizer, cutting chemical consumption by a noticeable margin. Here’s what you gain:
- Reduced need for algaecides and pH adjusters
- Longer lifespan for each chemical dose
- Lower overall maintenance costs
Consistent cover use simplifies your routine. You’re actively saving money and effort, all while keeping your water clear. It’s a win win for your wallet and your weekends.
Ease Of Installation
If you’ve ever wrestled with a bulky pool cover, you know the struggle is real—but it doesn’t have to be. For your 18-foot round pool, prioritize lightweight, flexible solar covers. They’re manageable and simplify covering or revealing daily. Look for a floating design; you just lay it directly on the water’s surface with zero complicated setup. A proper fit is key. Many covers are customizable with trimming, so you can cut for a snug fit that goes on and comes off quickly. Reinforced edges or handles make placement and removal a breeze. And don’t underestimate good instructions: clear, step-by-step guidance cuts your effort considerably. You’ll be done in minutes, not hours.
Warranty And Return Policy
You’ve nailed down a cover that fits easily and won’t fight you every time you reach for it. But before you buy, check the warranty period (3 to 7 years is typical). Does it cover weather damage, or only manufacturing defects? That’s a big one. Review the return policy too. Most give you 30 days, but some offer longer. Just make sure you know the rules:
- For a full refund, the cover must be unused and in its original packaging.
- Return shipping fees? They might be on you, so factor that in.
- And if you need to file a warranty claim, understand any extra requirements upfront.
A solid warranty and flexible return policy protect your investment, especially if something goes wrong. Don’t skip this step.
