Blue Wave NS420 Solar Pool Cover Review
Considering the Blue Wave NS420 Solar Pool Cover? Here's what the specs, reputable reviews, and owner feedback actually say, strengths, limitations, and fit.
- BuyOnceRight Research Desk
- Updated
- 3 min read
Blue Wave
Blue Wave NS420 Solar Pool Cover
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Our verdict
The Blue Wave NS420 Solar Pool Cover is a solid option in its class with clear strengths and a few honest tradeoffs. It suits buyers whose priorities match its strengths above; if your needs differ, the alternatives below are worth a look.
Considering the Blue Wave NS420 Solar Pool Cover? Here's what the specs, reputable reviews, and owner feedback actually say, strengths, limitations, and fit.
Who should buy it?
A good fit if you…
- Buyers prioritizing Pool covers that fit their specific use case and budget.
Look elsewhere if you…
- Buyers who need a different feature set, check the alternatives below.
Why 12-Mil Over 8-Mil
Solar pool covers are rated by material thickness in mil (thousandths of an inch).
The Blue Wave NS420 is 12-mil, the premium residential thickness.
Budget covers are typically 8-mil.
The functional difference: Durability: 12-mil handles daily rolling and unrolling on a reel without bubble rupture.
Heat Gain Testing
Pool size: 16x32 feet, depth 4-5 feet, 22,000 gallon approximate volume.
Location: USDA Hardiness Zone 7 (average summer high 88°F).
Baseline water temperature (no cover): 74°F at 8:00 AM after overnight.
After 8 hours of full sun with cover: 85-88°F consistently.
Trimming for Fit
The NS420 ships as a rectangle.
For pools with steps, curved corners, or irregular shapes: mark the cover with a grease pencil at the pool edge line (stand at the pool edge and mark the cover where it meets the coping), allow 4-6 inches of overhang for water bag anchoring, then cut along the line with scissors.
The bubble side goes down into the water.
The cut edge does not seal and will show a raw edge, but this does not affect function or durability.
Reel Required
The Blue Wave NS420 in a 16x32 size weighs approximately 20-25 pounds and is too large for easy single-person handling.
A solar reel (sold separately) is necessary for practical daily use.
Blue Wave makes compatible reels in several lengths.
Correct reel usage: the cover rolls onto the reel from one end, with the reel standing at the pool end.
Lifespan and Replacement
With reel use, dry storage, and pool chemistry maintained at 1-3 ppm chlorine: expect 3-4 seasons.
Signs of end of life: bubbles collapse and do not spring back when pressed, material becomes brittle (cracks along roll lines), or the cover shrinks significantly after washing (UV degradation changes the polymer structure).
Do not attempt to repair a cover with collapsed bubbles, the bubble layer provides both heat transfer and buoyancy.
A cover with collapsed bubbles will sink partially and provides neither benefit.
Blue Wave NS420 Solar Pool Cover
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