The Ultimate Guide to 16 Mil Solar Covers
What Is a 16 Mil Solar Cover — and Is It Right for Your Pool?
A 16 mil solar cover is the thickest solar blanket available on the market, designed to maximize heat retention, slash water evaporation, and extend your swimming season without relying on gas or electric heaters.
Quick comparison for shoppers:
| Feature | 8 Mil | 12 Mil | 16 Mil |
|---|---|---|---|
| Heat retention | Basic | Good | Best |
| Temperature increase | Up to ~10°F | Up to ~15°F | Up to 18°F |
| Evaporation reduction | Up to 95% | Up to 95% | Up to 95% |
| Durability | Light-duty | Medium-duty | Heavy-duty |
| Best for | Mild climates | Most pools | Cooler climates |
| Warranty (typical) | 3–4 years | 5 years | 7 years |
If you want the most heat, the longest lifespan, and the best value over time — a 16 mil cover wins on all three.
But it does come with trade-offs. It’s heavier than thinner covers (a 16×32 ft cover can weigh around 36 lbs), costs more upfront, and requires a reel system for easy handling. For some pool owners, a 12 mil cover may be the better fit.
This guide breaks down everything you need to know — from how 16 mil covers work, to how they compare to thinner covers, liquid blankets, and pool heaters, to how to install, maintain, and protect your investment.
Explore more about 16 mil solar cover:
Why a 16 Mil Solar Cover is the Ultimate Pool Heating Solution
When it comes to enjoying your pool in Northeastern Pennsylvania, the weather doesn’t always play nice. From the cooler spring mornings in Scranton to the brisk early autumn evenings in Wilkes-Barre, keeping your pool water at a comfortable swimming temperature can feel like a full-time job. That is where a heavy-duty 16 mil solar cover steps in as the ultimate backyard hero.
Unlike standard pool covers that merely shield your water from falling leaves, a high-quality solar blanket acts as a giant thermal battery. To understand how this fits into your overall backyard strategy, it helps to look at The Different Types of Pool Covers and how they function. While safety and winter covers protect your pool during the off-season, a solar cover is designed for active daily use during the swimming season.
The magic of a 16 mil cover lies in its rugged construction. Built with UV-stabilized resin, these covers are engineered to withstand intense summer sunlight without breaking down. Many premium models, such as the Ultra Rectangle Grey Solar Cover, 16 Mil, 7 Year Warranty, feature an advanced aluminized bottom layer. This specialized backing transfers heat faster and more efficiently into the water while preventing that precious warmth from radiating back out into the cool night air. For pool owners in cooler climates like Tannersville or Lake Wallenpaupack, this maximum heat retention is a game-changer.
Understanding Thickness: 16 Mil Solar Cover vs. Thinner Alternatives
If you have spent any time browsing for pool accessories, you know that solar covers come in various thicknesses, measured in “mils” (one-thousandth of an inch). The most common options are 8 mil, 12 mil, and the ultra-thick 16 mil.
Choosing the right thickness is a balancing act between physical weight and long-term durability. For a deeper dive into this topic, check out Solar Pool Covers That Won’t Quit: A Guide to Maximum Durability.
- 8 Mil Covers: These are lightweight and very easy to handle, but they offer minimal insulation and tend to degrade quickly under the harsh Pennsylvania sun. They are best suited for mild climates with short swim seasons.
- 12 Mil Covers: A popular middle-ground option, such as the Space Age Solar Cover 16′ x 36′ Rectangular 12 Mil, offers a decent balance of heat retention and weight. However, they lack the ultimate structural integrity of thicker blankets.
- 16 Mil Covers: As the thickest covers on the market, 16 mil options provide unmatched insulation. The dense material contains larger, more robust air bubbles that trap heat far better than thinner alternatives. While they are heavier to move—often requiring a sturdy reel system—their resistance to chemical wear, tearing, and UV degradation makes them the longest-lasting option available.
Thermal Efficiency: Temperature Rise and Evaporation Reduction
Exactly how much of a difference can a 16 mil solar cover make for your pool? The numbers speak for themselves.
A high-performance 16 mil cover can raise your pool’s water temperature by up to 18 degrees Fahrenheit solely by harnessing free energy from the sun. It achieves this by absorbing solar radiation during the day and locking that thermal energy in overnight.
Additionally, these covers are incredibly efficient at stopping water loss, reducing evaporation by up to 95%. Because the vast majority of pool heat loss occurs through evaporation at night, keeping the pool covered when not in use ensures that the warmth you gained during the day stays in the pool. This level of thermal efficiency is why even smaller pools benefit immensely from solar blankets; you can read more about this in our guide on Why Your 13 Ft Round Pool Needs a Solar Cover.
Comparing a 16 Mil Solar Cover to Liquid Blankets and Heaters
Many pool owners ask how a physical solar cover stacks up against other heating and conservation methods, like liquid solar blankets or mechanical heaters.
- Liquid Solar Blankets: These chemical barriers are convenient because they require no physical handling. However, they only reduce evaporation by about 30% to 40% and offer very minor heat retention compared to a physical barrier. They easily disperse in windy conditions, making them far less effective for backyard pools in open areas.
- Gas Heaters and Heat Pumps: While mechanical heaters allow you to set an exact water temperature, they are expensive to run. Using a 16 mil solar cover in conjunction with a heater is actually the smartest approach. The cover prevents the expensive heat generated by your heater from evaporating into thin air, slashing your monthly energy bills.
By acting as a natural barrier, the solar cover also prevents chemical evaporation. This means you will spend less money on chlorine and balancing chemicals throughout the summer. For more tips on maximizing your pool’s efficiency, see The Complete Guide to Inground Pool Solar Covers.
Installation, Maintenance, and Longevity of Heavy-Duty Covers
Investing in a premium 16 mil solar cover is only the first step; proper installation and routine care are what ensure your cover lasts for its full intended lifespan. Because 16 mil covers are heavy-duty, they require a bit more leverage to handle. For inground pools, we highly recommend pairing your cover with a high-quality solar reel system to make rolling and unrolling a simple, one-person job. To explore how to set up your pool area for success, take a look at our dedicated article on Inground Pool Solar Covers.
Best Practices for Installing and Trimming Your Cover
When your new solar cover arrives, it will likely be a standard rectangular, round, or oval shape. Don’t worry if it doesn’t match your pool’s exact contours right out of the box—solar covers are designed to be customized!
- Bubble Side Down: This is the most crucial rule of solar covers. Always install the cover with the bubble side facing down on the water. The flat, smooth side should face up toward the sky. The air bubbles act as magnifying glasses for sunlight and provide the insulating air barrier that prevents heat loss.
- Let It Settle: Spread the cover across your pool’s surface and let it sit in the sun for a few hours. This allows the packing wrinkles to relax and the material to expand to its true size.
- Trimming to Fit: Use a sharp pair of household scissors to trim the cover along the inside edge of your pool’s tile line or coping. It is best to leave a slight overhang of about 1 to 2 inches. This small buffer prevents leaves and debris from slipping past the edges and falling into the water. For detailed advice on sizing covers for various layouts, read our guide on Choosing a 13 Ft Pool Cover.
Whether you have a standard layout or a custom shape, products like the Ultra 16′ x 32′ Rectangle Grey Solar Pool Cover, 16 Mil or the Sun2Solar® Standard Blue Solar Cover 16′ Round 1600 Series can be easily trimmed to fit kidney, oval, or classic Grecian pool shapes.
Maintenance, Chemical Balance, and Storage Tips
A 16 mil solar cover is incredibly tough, but aggressive pool chemicals can degrade even the strongest polymer materials over time. To protect your investment, keep these best practices in mind:
- Watch the Chlorine and pH: High sanitizer levels will quickly eat away at the solar bubbles. Only place the cover on your pool when your chlorine level is below 2.5 ppm and your pH is balanced between 7.2 and 7.6.
- Remove During Shocking: Never leave your solar cover on the pool after shocking the water. Keep the cover off for at least 24 hours—or until active chlorine levels return to safe swimming parameters.
- Proper Shade Storage: When you take the cover off to swim, do not leave it rolled up in direct sunlight. The trapped heat inside a rolled-up cover can reach scorching temperatures, causing the bubbles to delaminate or melt. Store your folded or rolled cover in a shaded area, or use a protective poly tarp sheet to shield it from UV rays.
- Winterizing: Before freezing Pennsylvania winters arrive, clean your solar cover with a soft brush and mild soap. Rinse it thoroughly, let it dry completely to prevent mold, and store it indoors or in a protected shed. For a complete seasonal checklist, refer to our Ultimate Checklist for 10ft Swimming Pool with Cover.
Warranty Coverage and Protecting Your Investment
Because of their superior thickness and construction, premium 16 mil solar covers typically come backed by a 7-year manufacturer limited warranty.
It is important to understand what this warranty covers. Typically, the warranty protects you against manufacturing defects such as seam separation (where the panels are welded together) and delamination (where the flat backing separates from the bubble layer).
However, warranties do not cover damage caused by improper chemical use, leaving the cover in the sun while rolled up, physical tears from dogs, or scraping against rough concrete deck edges.
By practicing proper chemical management and storing your cover safely, you can ensure your heavy-duty solar blanket keeps your pool warm for many seasons to come. If you need help selecting the perfect cover or require high-quality pool chemicals to keep your water balanced, the experts at Aqua Leisure Pools and Spas are always here to help. Drop by any of our local showrooms or check out our Aqua Leisure Pools and Spas Wilkes-Barre Supplies page to find everything you need to create your perfect backyard oasis.
Posted by chris@enx2marketing.com in Pools