Intex 18 ft × 9 ft Rectangle Solar Pool Cover Review
- AboveGroundSplash
- May 1
- 8 min read
The Intex 18 ft × 9 ft Rectangle Solar Pool Cover is a lightweight solar blanket designed for rectangular Intex frame pools. It floats directly on the water, helping reduce evaporation, slow heat loss, and keep your pool warmer between swims.
This cover is best for pool owners who want a simple, low-cost way to retain more heat without installing a heater. It will not heat your pool like a heat pump, and it is not as heavy-duty as thicker 12mm or 16mm solar covers, but it can make a noticeable difference when used consistently during sunny days and overnight.
If you are still comparing pool warming options, see our Heat Pumps & Solar Covers guide for solar covers, heater mats, heat pumps, and other above-ground pool heating choices.
In this review, we’ll cover how the Intex 18 × 9 solar cover works, who it is best for, how to use it correctly, what its limits are, and when you may be better off with a thicker rectangle solar cover or an active pool heating option.
Intex 18 ft × 9 ft Solar Pool Cover — Quick Verdict
The Intex 18 ft × 9 ft Rectangle Solar Pool Cover is worth considering if you own a matching rectangular frame pool and want an affordable way to reduce heat loss and evaporation.
Its biggest strength is simplicity. You place it bubble-side down on the water when the pool is not in use, then remove it before swimming. It is lightweight, easy to handle, and usually much cheaper than powered heating equipment.
Its biggest weakness is performance. This is a passive solar cover, not an active heater. It works best when your pool already gets good sunlight and you leave the cover on overnight to hold more of that warmth.
Best for: 18 ft × 9 ft rectangular Intex frame pools.
Main strength: Affordable heat retention and evaporation reduction.
Main limitation: Not a strong heater and not as durable as thicker solar covers.
Bottom line: Choose it if you want a low-cost cover that fits a common 18 × 9 rectangle frame pool. Choose a thicker solar cover or heat pump if you want stronger heating performance.
Intex 18 × 9 Solar Pool Cover Specs at a Glance
The Intex 18 × 9 rectangle solar cover is a lightweight floating solar blanket designed mainly to reduce evaporation and slow heat loss on matching rectangular frame pools. It is best used as a heat-retention cover, not as a replacement for a pool heater.
What does the Intex 18 × 9 solar pool cover do?
The Intex 18 × 9 solar pool cover helps your rectangular pool hold onto more warmth when the pool is not being used.
It floats on the water surface with the bubble side facing down. During sunny weather, the cover can help the water absorb and retain heat. Overnight, it helps slow heat loss by reducing exposure to cooler air.
The biggest benefit is not magic heating. It is heat retention. If your pool warms during the day, the cover helps keep more of that warmth in the water for longer.
It also helps reduce evaporation and can limit some debris from entering the pool, although it should not be treated as a winter cover, safety cover, or storm cover.
What the Intex rectangle solar cover does well
Helps retain pool warmth
The main reason to use this cover is to keep more warmth in the pool between swims. It is especially useful overnight, when uncovered pools can lose heat through the water surface.
If your pool gets direct sunlight during the day, leaving the cover on when the pool is not in use can help the water stay warmer for longer.
Reduces evaporation
By covering the water surface, the solar cover helps slow evaporation. That means less water loss, fewer top-ups, and less heat escaping from the pool.
This is useful during warm, dry, or windy weather, when uncovered pools can lose water more quickly.
Lightweight and easy to handle
Because this is a lightweight Intex cover, it is easier to place, remove, fold, and store than many thicker solar blankets.
That matters because a solar cover only works if you actually use it. A heavy cover that is awkward to remove often ends up sitting unused.
Designed for 18 ft × 9 ft rectangular frame pools
This cover is made for a specific pool size, which makes it easier to choose if you own an 18 × 9 rectangular Intex frame pool.
If your pool is a different rectangle size, check the measurements carefully before buying. If your pool is round, use an Intex round solar cover instead.
How the Intex 18 × 9 solar cover works
A solar pool cover works by covering the surface of the water.
The bubble side should face down into the pool. This helps the cover float properly and improves heat transfer from the sun into the water. The smooth side faces upward.
During the day, the cover can help the water warm when the pool is in direct sunlight. At night, the cover helps reduce heat loss by limiting direct contact between the water and cooler air.
This is why the cover is most effective when used consistently. Put it on whenever the pool is not being used, and leave it on overnight if your goal is warmer water the next day.
Do not expect it to work like a pool heat pump or gas heater. It is a low-cost heat-retention tool, not a powered heating system.
How to get better results from the Intex rectangle solar cover
Place it bubble side down
The bubbles should face the water. The smoother side should face upward.
If the cover is placed upside down, it may still float, but it will not sit or perform as intended.
Use it when the pool is not in use
Put the cover on after swimming and leave it on when the pool is sitting unused.
This helps reduce evaporation, slow heat loss, and keep debris out of the water.
Leave it on overnight
If warmer water is the goal, leave the cover on overnight. Removing it at night allows more heat to escape, especially during cooler evenings.
Pair it with a solar heater mat or pool heater
A solar cover works even better when paired with active heating. If you use an Intex Solar Heater Mat or a pool heat pump, the cover helps hold onto the heat those systems add.
Store it properly
Rinse the cover occasionally with clean water and let it dry before long-term storage.
Do not leave it folded in strong direct sun when it is dry. That can shorten the life of the material.
Pros and cons of the Intex 18 × 9 solar pool cover
Pros
Affordable way to reduce heat loss.
Designed for 18 ft × 9 ft rectangular Intex frame pools.
Lightweight and easy to handle.
Helps reduce evaporation when the pool is covered.
Useful when paired with a solar heater mat, heat pump, or gas heater.
Usually easier to manage than thicker heavy-duty solar blankets.
Cons
Only fits specific rectangular pool sizes.
Not a powerful heater.
Not as durable as thicker 12mm or 16mm solar covers.
Can lift in strong wind.
Not a safety cover or winter cover.
May only last a season or two depending on sun exposure, storage, and water chemistry.
Who should buy the Intex 18 × 9 solar pool cover?
Choose the Intex 18 × 9 Rectangle Solar Pool Cover if you own a matching rectangular frame pool and want a simple, affordable way to reduce heat loss and evaporation.
It makes the most sense if:
You have an 18 ft × 9 ft Intex rectangular frame pool.
You want a lightweight cover that is easy to remove.
You want to hold more warmth overnight.
You want to reduce evaporation between swims.
You are looking for a low-cost upgrade before buying a heater.
You already use, or plan to use, an Intex Solar Heater Mat.
Who should skip it?
Skip this cover if you need strong heating, heavy-duty durability, or safety protection.
It may not be the right choice if:
Your pool is not close to 18 ft × 9 ft.
Your yard is very windy.
You want a thick 12mm or 16mm solar cover.
You need a winter cover or safety cover.
You want fast heating regardless of the weather.
For stronger heat retention, compare it with a thicker VEVOR rectangle solar cover. For active heating, compare it with the Intex Solar Heater Mat or a pool heat pump.
Intex 18 × 9 solar cover vs VEVOR rectangle cover vs solar heater mat
The Intex 18 × 9 solar cover is best if you own the matching rectangular frame pool and want a lightweight, low-cost cover that is easy to use every day.
A VEVOR rectangle solar cover is better if you want more size and thickness options. The 12mm and 16mm versions are usually better for stronger heat retention, but they are heavier and may be more awkward to handle.
An Intex Solar Heater Mat does a different job. It sends water through a solar mat to add warmth during sunny weather. The solar cover then helps keep that warmth from escaping overnight.
For many pool owners, the best low-cost setup is to use a solar heater mat during sunny hours and a solar cover overnight. If you want stronger and more reliable heating, compare these options with a dedicated pool heat pump.
Final Verdict: Is the Intex 18 × 9 Solar Pool Cover Worth It?
The Intex 18 ft × 9 ft Rectangle Solar Pool Cover is worth it if you own a matching rectangular frame pool and want a cheap, easy way to retain more warmth.
It is not a powerful heater, and it is not as durable as thicker premium solar covers. But for everyday heat retention, evaporation reduction, and basic debris protection, it is a practical upgrade for a small rectangular above-ground pool.
Choose this cover if you want the simplest fit for an 18 × 9 Intex frame pool. Choose a thicker VEVOR rectangle cover if heat retention matters more than weight. Choose a pool heat pump if you want stronger, more reliable heating.
Frequently Asked Questions
Does the Intex 18 × 9 solar pool cover heat the pool?
The Intex 18 × 9 solar pool cover can help the sun warm the water and reduce heat loss, but it is not a powered heater. It works best as a heat-retention cover for sunny days and overnight use.
What pools does the Intex 18 × 9 solar cover fit?
This cover is designed for 18 ft × 9 ft rectangular Intex frame pools. If your pool is a different size, check the exact measurements before buying.
Should the bubbles face up or down?
The bubbles should face down into the water. The smooth side should face upward.
Can I leave the Intex solar cover on overnight?
Yes. Leaving the solar cover on overnight helps reduce heat loss when the air temperature drops. This is one of the best ways to keep more warmth in the pool.
Is the Intex 18 × 9 solar cover a safety cover?
No. This is not a safety cover, winter cover, or weight-bearing cover. It should not be used as a safety barrier for children, pets, or debris-heavy winter protection.
Can I cut the Intex rectangle solar cover to fit?
If the cover is slightly too large, it may be possible to trim it carefully. However, because this model is designed for a specific 18 ft × 9 ft rectangular pool, it is better to choose the closest correct size before buying.
Is an Intex solar cover better than an Intex Solar Heater Mat?
They do different jobs. The solar cover helps retain heat and reduce evaporation, while the Intex Solar Heater Mat helps add warmth during sunny weather. For best results, they can be used together.
Is a thicker VEVOR rectangle solar cover better?
A thicker VEVOR rectangle solar cover may offer stronger heat retention and more size options. The trade-off is weight, handling, and usually a higher price.
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