21 ft solar pool cover round
Worth a lookShows demand growing +533.9% this quarter, but a failed launch gate (market size, growth, or returns) keeps it on the watch list.
Growth
Incredible+533.9%90-day search growth — must beat 0% to launch
Returns
Incredible0.2%return rate — above 5% kills the launch gate
Conversion
Great7.7%search→purchase rate — share of searches ending in a sale
Quality gap
Good4.3★avg incumbent rating — lower means beatable quality
Avg price
Good$116.97avg listing price — sweet spot $15–$100
Review moat
Good1,132.11avg incumbent reviews — the moat a new listing must climb
Brand share
Okay85%top-5 brand share — brands hold most of the demand
Competition
Okay66%top-5 click share — leaders hold, buyers still browse
Market size
Okay$120K$120K/yr · 13K searches
Price range
Bad$75.03–$253.48cheapest to priciest tracked listing — scored on the share inside $15–$100
According to Flapen's Amazon United States niche tracking, 21 ft solar pool cover round is a $120K/yr Amazon United States market (13K searches/yr). The top 5 brands hold 85% of demand. Demand peaks in May–Jun–Jul. Verdict: Worth a look — 59/100.
Data updated Jul 24, 2026 · scored weekly · How we score niches
21 ft solar pool cover round market data
- Units sold / yr
- 750–1K
- avg 0–100/product
- Revenue / yr
- $88K–$117K
- units × avg price
- Conversion rate
- 7.7%
- Avg BSR
- #244
- Page quality
- 0%
- Prime
- 50%
- Sponsored
- 94%
- Out of stock
- 5.1%
- Avg brand age
- 47 months
- Avg seller age
- 197 days
Competition & brand share
The top 5 products take 66% of clicks — established leaders, but buyers still shop beyond them.Brands
11 falling
Sellers
17
Top-5 brand share
85%
Top 20: 100%
Top-5 click share
66%
Top 20: 100%
Open market
11%
- In The Swim38%
- Sun2Solar19%
- Blue Wave11%
- Doheny's10%
- Shop Square8%
- Yankee Pool Pillow4%
- Open — no brand owns it (5 brands, 11%)
Demand & seasonality
Weekly Amazon search volume, last 98 weeks — +533.9% search growth over the last 90 days.Peak months: May, Jun, Jul · busiest ÷ quietest = 51.4×
Top 21 ft solar pool cover round search terms
- 21 foot round solar pool cover6K/yr
- 21 round solar pool cover4K/yr
- 21 ft solar pool cover round4K/yr
Top 21 ft solar pool cover round products on Amazon
Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.
All 18 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
In The Swim 21 Standard Blue Round Solar Pool Cover 8 Mil for Solar Heating Above Ground Pools and Inground Pools
In The Swim$78.624.2★875 rev
Sun2Solar Blue 21 ft Round Pool Solar Cover | 12 Mil | Heat Retaining Blanket for Inground & Above Ground Swimming Pools | Suns Energy Heats Pool | Bubble Heating Blankets | 1200 Series
Sun2Solar$119.494.3★4,517 rev
Dohenys Clear-Tek Micro Bubble Solar Pool Cover for Above Ground Swimming Pools | Increase Solar Energy Absorption Retain Heat Reduce Evaporation Reduce Heat Loss & Save 21 ft Round Blue 1600
Doheny's$93.984.3★1,417 rev
21 Foot Round Solar Cover for Inground and Above Ground Pools 12 Mil - Premium Heavy Duty Solar Blanket for Above Ground Pool Blue - Made in USA
Shop Square$118.404.6★115 rev
Blue Wave 21-ft Round Solar Pool Cover 8-Mil Blue Solar Cover for Above Ground Pool Thermal Bubble Blanket for Heat Retention & Reduced Evaporation
Blue Wave$115.534.3★791 rev
Newest
by launch date
Blue Wave 21-ft Round Solar Pool Cover 8-Mil Blue Solar Cover for Above Ground Pool Thermal Bubble Blanket for Heat Retention & Reduced Evaporation
Blue Wave$97.7233 rev
VINGLI 12Mil Solar Pool Cover Rectangle Solar Blanket-Heavy Duty Solar Pool Cover for Above Ground Pool-Pool Solar Cover for Inground Pool (Blue 21 Round)
VINGLI$121.97733 rev
Avolend 21 Ft Round Pool Cover Heavy Duty 500D Solar Cover for Above Ground Pool Excellent Windproof with Reflective Handles & Luminous Ground Nails Cold and UV Resistant
Avolend$92.3348 rev
21 ft Round Pool Covers for Above Ground Pools Thicker Solar Pool Cover Protector - Heavy Duty Tear Resistant Fabric with Ropes and Ground Nails Waterproof Dustproof Windproof (Black)
Mosenpol$75.0316 rev
BigXwell 21ft Round Solar Pool Cover 16 Mil Heavy-Duty Solar Blanket for Above Ground Pools - Reduces Evaporation Retains Heat Blocks Debris Blue Bubble
BigXwell$253.488 rev
Trending
90-day click momentumBlue Wave 21-ft Round Solar Pool Cover 8-Mil Blue Solar Cover for Above Ground Pool Thermal Bubble Blanket for Heat Retention & Reduced Evaporation
Blue Wave$97.724.2★
21 ft Round Pool Covers for Above Ground Pools Thicker Solar Pool Cover Protector - Heavy Duty Tear Resistant Fabric with Ropes and Ground Nails Waterproof Dustproof Windproof (Black)
Mosenpol$75.034.4★
VINGLI 12Mil Solar Pool Cover Rectangle Solar Blanket-Heavy Duty Solar Pool Cover for Above Ground Pool-Pool Solar Cover for Inground Pool (Blue 21 Round)
VINGLI$121.974.5★
Dohenys Clear-Tek Micro Bubble Solar Pool Cover for Above Ground Swimming Pools | Increase Solar Energy Absorption Retain Heat Reduce Evaporation Reduce Heat Loss & Save 21 ft Round Blue 1600
Doheny's$93.984.3★
BigXwell 21ft Round Solar Pool Cover 16 Mil Heavy-Duty Solar Blanket for Above Ground Pools - Reduces Evaporation Retains Heat Blocks Debris Blue Bubble
BigXwell$253.484.5★
What buyers say about 21 ft solar pool cover round
What buyers praise and complain about, mined from review topics.What buyers love
“Overall, expensive upfront, but very effective and practical for extending the swimming season and helping to keep elecrtic bill down while using my pool heat pump”
“Perfect fit”
“Personally we like the thinner solar cover, it's easier for us to get on and off”
“helps keep debris out while also holding some heat in”
“It keeps the water at least 10° warmer”
“Very easy to use”
“honestly just for picking up the incredibly heavy box”
“Great cover very thick should last a long time I ordered for a 21 foot pool”
“Very sturdy, seems to be working well on the pool”
“Good value”
What buyers complain about
“this one is thicker than others The first one to have a two year full coverage warranty”
“Bubbles break within 1 full season”
“The item doesnt fit as described”
“This pool cover is a bit heavier than expected”
“Difficult to use”
“This cover is the cheapest, thinnest cover”
“Eventually, the plastic usually starts to break down and little pieces end up getting caught in the filter, so longevity really matters”
“Very expensive bubble rap”
“The item doesnt fit as described”
“poor design”
Top return reasons
Common questions
- Is 21 ft solar pool cover round profitable to sell on Amazon United States?
- The niche generates $120K/yr across 18 tracked products. 4 of 5 products launched in the last 360 days are still selling. 90-day search growth is +533.9%. Flapen's verdict: Worth a look (59/100).
- How competitive is the 21 ft solar pool cover round niche?
- 11 brands and 17 sellers compete. The top 5 products take 66% of clicks and top 5 brands hold 85% of demand.
- What do buyers complain about in 21 ft solar pool cover round?
- Top complaints mined from reviews: Thickness, Durability, Size-Overall. The return rate is 0.2%.
- When does demand for 21 ft solar pool cover round peak?
- Demand peaks in May–Jun–Jul; the busiest month runs 51.4× the quietest.
- What does it cost to enter the 21 ft solar pool cover round niche?
- Listings span $75.03–$253.48; the average listing price is $116.97 (sweet spot $15–$100). The average incumbent carries 1,132 reviews — the moat a new listing must climb.