Sun2Solar Blue 21 ft Round Pool Solar Cover - Heat Retaining

In this review of the Sun2Solar Blue 21 ft Round Pool Solar Cover the bottom line is simple: this is a practical, low-effort way to capture free solar energy and reduce evaporation for small round inground or above ground pools. The biggest reason to buy is temperature gain - the cover is designed to raise water temperature up to 15 degrees while trapping heat overnight, so it is best suited to owners who want cleaner water, fewer chemical top-ups, and modest warming without running a heater. The review reflects real user experience on fit, warmth, and durability.

Key Features

• Free Solar Energy: The cover uses sunlight to warm pool water and can raise temperatures by up to 15 degrees given good sun exposure.
• Heat Retention: Its bubble heating blanket construction helps retain warmth long after sunset so water stays more comfortable overnight.
• Evaporation Control: By reducing evaporation up to 95%, the cover conserves water and reduces the need for frequent chemical adjustments.
• Debris Prevention: The cover stops leaves and debris from entering the pool, cutting back on routine cleaning and pump strain.
• Easy Installation: A durable design with extra overlap makes it simple to fit, trim, and remove for both above ground and inground pools.

Who It's For

The Sun2Solar cover is for pool owners who want a cost-effective way to increase water warmth and lower evaporation without installing a heater. It is particularly well suited to those with round 21 ft pools or similar sizes who value reduced water and chemical use, and who are willing to place and remove a cover seasonally.

People who need a heavy-duty commercial cover or who expect multi-year rugged performance under constant rough handling should look elsewhere, as some users report mixed durability over time. It is not intended as a safety cover or a long-term structural barrier for children or pets.

Pros & Cons

Pros

• Effectively warms water by harnessing solar energy, improving swim comfort on sunny days.
• Significantly reduces evaporation, which helps conserve water and lower chemical needs.
• Stops leaves and debris from entering the pool, reducing maintenance tasks.
• Simple to install and trim to fit around protrusions for both above ground and inground pools.

Cons

• Durability varies: while many find it holds up well, a minority report tearing or premature wear under heavy use.
• Not a safety cover and will require regular on/off handling each season for best results.

Specifications

Product Type	Round solar pool cover / bubble heating blanket
Diameter	21 ft
Intended Pools	Inground and above ground pools
Main Benefit	Raises water temperature up to 15 degrees
Evaporation Reduction	Up to 95%
Additional Features	Debris prevention, extra overlap for trim and fit

Our Verdict

The Sun2Solar Blue 21 ft cover is a sensible, affordable option for pool owners who want to harvest solar heat and cut evaporation without complex installation. It offers clear benefits in warmth and maintenance reduction and represents good value for seasonal use, but those needing maximum long-term durability or a certified safety barrier should consider heavier-duty alternatives.

Frequently Asked Questions

Will this cover fit both above ground and inground pools?
Yes, the design is made for both above ground and inground pools and includes extra overlap so you can trim for a better fit.

How much warmer will my pool get?
Under good sun exposure the cover can raise water temperature by up to 15 degrees, with retained warmth overnight thanks to the bubble construction.

Does it prevent evaporation?
Yes, the cover is designed to reduce evaporation by up to 95%, which helps conserve water and reduce chemical use.