tunze auto top off
Skip itSoft demand (-58.5% this quarter) — this niche doesn't clear our bar today.
Review moat
Great300avg incumbent reviews — the moat a new listing must climb
Quality gap
Great4.2★avg incumbent rating — lower means beatable quality
Avg price
Great$98.06avg listing price — sweet spot $15–$100
Conversion
Good5.5%search→purchase rate — share of searches ending in a sale
Returns
Okay3.5%return rate — above 6% kills the launch gate
Price range
Okay$37.36–$244.77cheapest to priciest tracked listing — scored on the share inside $15–$100
Market size
Bad$38K$38K/yr · 7K searches
Competition
Bad90%top-5 click share — a locked-up shelf
Growth
Bad-58.5%90-day search growth — must beat 0% to launch
Brand share
Bad100%top-5 brand share — brand-locked demand
According to Flapen's Amazon United States niche tracking, tunze auto top off is a $38K/yr Amazon United States market (7K searches/yr). The top 5 brands hold 100% of demand. Demand peaks in Jan–Feb. Verdict: Skip it — 31/100.
Data updated Jul 17, 2026 · scored weekly · How we score niches
tunze auto top off market data
- Units sold / yr
- 250–500
- avg 0–100/product
- Revenue / yr
- $25K–$49K
- units × avg price
- Launch success
- —
- 0 of 0 new (360d)
- Conversion rate
- 5.5%
- Avg BSR
- #351
- Page quality
- 0%
- Prime
- 86%
- Sponsored
- 57%
- Out of stock
- 8.5%
- Avg brand age
- 34 months
- Avg seller age
- 204 days
Competition & brand share
The top 5 products capture 90% of clicks — a locked-up shelf that new listings rarely crack.Brands
4 falling
Sellers
11
Top-5 brand share
100%
Top 20: 100%
Top-5 click share
90%
Top 20: 100%
Open market
0%
- Tunze83%
- Useek7%
- FZONE5%
- MagTool5%
Demand & seasonality
Weekly Amazon search volume, last 104 weeks — -58.5% search growth over the last 90 days.Peak months: Jan, Feb · busiest ÷ quietest = 1.9×
Top tunze auto top off 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 7 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
Tunze 3151 Osmolator 3 Nano
Tunze$149.563.7★17 rev
Osmolator 3
Tunze$244.774.3★35 rev
Tunze Replacement Metering Pump for Osmolator and Nano Osmolator 5000.020
Tunze$37.364.5★686 rev
Useek Auto Top Off for Saltwater Aquarium Water ATO System for Both Reef and Fresh Tank - Blue
Useek$39.933.9★768 rev
Tunze Osmolator 3155 Water Level Controller Controlled Power Socket
Tunze$99.645.0★2 rev
Newest
by launch date
MagTool Aquarium Auto Top Off System Upgraded Version Aquarium ATO with Dual Optical Sensor for Both Reef and Fresh Tanks(Duetto V2026)
MagTool$57.74177 rev
Tunze 3151 Osmolator 3 Nano
Tunze$149.5617 rev
Osmolator 3
Tunze$244.7735 rev
FZONE Aquarium ATO with Controller QST2.0 Auto Top Off System for Saltwater Aquarium & Freshwater Aquarium
FZONE$57.40415 rev
Useek Auto Top Off for Saltwater Aquarium Water ATO System for Both Reef and Fresh Tank - Blue
Useek$39.93768 rev
Trending
90-day click momentumOsmolator 3
Tunze$244.774.3★
FZONE Aquarium ATO with Controller QST2.0 Auto Top Off System for Saltwater Aquarium & Freshwater Aquarium
FZONE$57.404.0★
Tunze Osmolator 3155 Water Level Controller Controlled Power Socket
Tunze$99.645.0★
Tunze 3151 Osmolator 3 Nano
Tunze$149.563.7★
Useek Auto Top Off for Saltwater Aquarium Water ATO System for Both Reef and Fresh Tank - Blue
Useek$39.933.9★
What buyers say about tunze auto top off
What buyers praise and complain about, mined from review topics.What buyers love
“The price is good”
“The build quality feels solid”
“Ease of use”
“The water flow is consistent”
“It fit great”
“its so easy to install that you can install without the instructions”
“excellent size y good durability”
“Works as advertised”
“Compact size”
“The instructions were clear”
What buyers complain about
“Broke after a couple of months”
“Not very reliable”
“The units Didnt shut off”
“It let too much water evaporate before topping off”
“Clamp didn't fit”
“But they are expensive”
“Tends to put a little too much water”
“My only complaint is the Velcro tape was not strong enough”
“it overflowed my tank”
“the pump ran dry”
Top return reasons
Common questions
- Is tunze auto top off profitable to sell on Amazon United States?
- The niche generates $38K/yr across 7 tracked products. 90-day search growth is -58.5%. Flapen's verdict: Skip it (31/100).
- How competitive is the tunze auto top off niche?
- 4 brands and 11 sellers compete. The top 5 products take 90% of clicks and top 5 brands hold 100% of demand.
- What do buyers complain about in tunze auto top off?
- Top complaints mined from reviews: Durability, Quality-Overall, Functionality-Overall. The return rate is 3.5%.
- When does demand for tunze auto top off peak?
- Demand peaks in Jan–Feb; the busiest month runs 1.9× the quietest.
- What does it cost to enter the tunze auto top off niche?
- Listings span $37.36–$244.77; the average listing price is $98.06 (sweet spot $15–$100). The average incumbent carries 300 reviews — the moat a new listing must climb.