---
title: "21 Ft Solar Pool Cover Round — $120K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/patio-lawn-garden/21-ft-solar-pool-cover-round"
last_updated: "2026-08-09T03:44:10.348Z"
locale: en
meta:
description: "Niche score 59/100 · $120K/yr market. A failed launch gate (market size, growth, or returns) keeps it on the watch list. Data updated Jul 2026."
"og:description": "Niche score 59/100 · $120K/yr market. A failed launch gate (market size, growth, or returns) keeps it on the watch list. Data updated Jul 2026."
"og:title": "21 Ft Solar Pool Cover Round — $120K/yr Amazon US Niche (2026) - Flapen"
---
# **21 ft solar pool cover round**
**Worth a look**
Shows demand growing +533.9% this quarter, but a failed launch gate (market size, growth, or returns) keeps it on the watch list.
Market size 28Growth 100Conversion 78Competition 32Returns 99Price range 14Avg price 69Brand share 33Review moat 59Quality gap 70
**Growth**
**Incredible****+533.9%**
90-day search growth — must beat 0% to launch
**Returns**
**Incredible****0.2%**
return rate — above 5% kills the launch gate
**Conversion**
**Great****7.7%**
search→purchase rate — share of searches ending in a sale
**Quality gap**
**Good****4.3★**
avg incumbent rating — lower means beatable quality
**Avg price**
**Good****$116.97**
avg listing price — sweet spot $15–$100
**Review moat**
**Good****1,132.11**
avg incumbent reviews — the moat a new listing must climb
**Brand share**
**Okay****85%**
top-5 brand share — brands hold most of the demand
**Competition**
**Okay****66%**
top-5 click share — leaders hold, buyers still browse
**Market size**
**Okay****$120K**
$120K/yr · 13K searches
**Price range**
**Bad****$75.03–$253.48**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Signals**[** Trending**](https://flapen.com/research/niches?market=us&signal=trending "Search growth > 100% (90d)") [** High Price**](https://flapen.com/research/niches?market=us&signal=high_price "Avg price > $50")
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 ~~](https://flapen.com/research/methodology)
## **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.
2K1KSpike '25Black Friday '25Spike '26 seasonSepDecMarJunAugMarMay
Peak months: May, Jun, Jul · busiest ÷ quietest = 51.4×
[**Open Trend **](https://flapen.com/research/us/patio-lawn-garden/21-ft-solar-pool-cover-round/trend)
## **Top 21 ft solar pool cover round search terms**
- **21 foot round solar pool cover**6K/yr+688.5%7.0% conv. - **21 round solar pool cover**4K/yr+573.5%5.7% conv. - **21 ft solar pool cover round**4K/yr+361.0%6.1% conv. [**All search terms **](https://flapen.com/research/us/patio-lawn-garden/21-ft-solar-pool-cover-round/search-terms)
## **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.
0%10%$12K20%$24K30%$36K40%$48K1101001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 18 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**In The Swim 21 Standard Blue Round Solar Pool Cover 8 Mil for Solar Heating Above Ground Pools and Inground Pools**In The Swim**$78.62**4.2★875 rev](https://www.amazon.com/dp/B0CB7G4D3V) [2**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**$119.49**4.3★4,517 rev](https://www.amazon.com/dp/B00DV53OLS) [3**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**$93.98**4.3★1,417 rev](https://www.amazon.com/dp/B08666VQKK) [4**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**$118.40**4.6★115 rev](https://www.amazon.com/dp/B0DXQGKYPV) [5**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**$115.53**4.3★791 rev](https://www.amazon.com/dp/B003B0SL9S)
**~~View all top sellers →~~**
### **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**$97.72**33 rev3mo ago](https://www.amazon.com/dp/B0GWRPYWLP) [**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**$121.97**733 rev4mo ago](https://www.amazon.com/dp/B0GRTX46FT) [**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**$92.33**48 rev5mo ago](https://www.amazon.com/dp/B0FZPJPLC2) [**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**$75.03**16 rev6mo ago](https://www.amazon.com/dp/B0GJCZ4J48) [**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**$253.48**8 rev7mo ago](https://www.amazon.com/dp/B0G4P1DF6K)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**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**$97.72**4.2★**▲ 37%**](https://www.amazon.com/dp/B0GWRPYWLP) [**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**$75.03**4.4★**▲ 36%**](https://www.amazon.com/dp/B0GJCZ4J48) [**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**$121.97**4.5★**▲ 34%**](https://www.amazon.com/dp/B0GRTX46FT) [**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**$93.98**4.3★**▲ 29%**](https://www.amazon.com/dp/B08666VQKK) [**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**$253.48**4.5★**▲ 27%**](https://www.amazon.com/dp/B0G4P1DF6K)
**~~View all trending →~~**
## **What buyers say about 21 ft solar pool cover round**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Quality-Overall**23%
*“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”*
**Size-Overall**16%
*“Perfect fit”*
**Sun Shade/Wind Shield**11%
*“Personally we like the thinner solar cover, it's easier for us to get on and off”*
**Heating**9%
*“helps keep debris out while also holding some heat in”*
**Water Resistance**8%
*“It keeps the water at least 10° warmer”*
**Ease Of Use**5%
*“Very easy to use”*
**Weight Heavy**4%
*“honestly just for picking up the incredibly heavy box”*
**Thickness**3%
*“Great cover very thick should last a long time I ordered for a 21 foot pool”*
**Strength**3%
*“Very sturdy, seems to be working well on the pool”*
**Value For Money**3%
*“Good value”*
### **What buyers complain about **
**Thickness**24%
*“this one is thicker than others The first one to have a two year full coverage warranty”*
**Durability**15%
*“Bubbles break within 1 full season”*
**Size-Overall**13%
*“The item doesnt fit as described”*
**Weight Heavy**7%
*“This pool cover is a bit heavier than expected”*
**Ease Of Use**6%
*“Difficult to use”*
**Quality-Overall**5%
*“This cover is the cheapest, thinnest cover”*
**Filtration**4%
*“Eventually, the plastic usually starts to break down and little pieces end up getting caught in the filter, so longevity really matters”*
**Value For Money**2%
*“Very expensive bubble rap”*
**Advertised Vs Actual Product**2%
*“The item doesnt fit as described”*
**Design-Overall**2%
*“poor design”*
### **Top return reasons **
**Size-Overall**44%
**Advertised Vs Actual Product**15%
**Thin**7%
**Functionality-Overall**5%
**Weight Heavy**5%
**Material Quality**3%
**Heating**3%
**Stitch/Finish/Polish**3%
**Leak-Proof**2%
**Strength**2%
## **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.
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