---
title: "Trend — expansion tank - Flapen"
canonical_url: "https://flapen.com/research/us/tools-home-improvement/expansion-tank/trend"
last_updated: "2026-08-09T03:15:45.034Z"
locale: en
meta:
  description: "Niche score 42/100 · $229K/yr market · 148K searches/yr · $45.31 avg price. Doesn't clear our bar today. Data updated Jul 2026."
  "og:description": "Niche score 42/100 · $229K/yr market · 148K searches/yr · $45.31 avg price. Doesn't clear our bar today. Data updated Jul 2026."
  "og:title": "Trend — expansion tank - Flapen"
---

# **expansion tank**

**Skip it**

Soft demand (-35.4% this quarter) — this niche doesn't clear our bar today.

Market size 43Growth 7Conversion 43Competition 24Returns 64Price range 95Avg price 95Brand share 42Review moat 91Quality gap 23

**Avg price**

**Incredible****$45.31**

avg listing price — sweet spot $15–$100

**Price range**

**Incredible****$15.73–$78.69**

cheapest to priciest tracked listing — scored on the share inside $15–$100

**Review moat**

**Great****184.8**

avg incumbent reviews — the moat a new listing must climb

**Returns**

**Good****2.5%**

return rate — above 5% kills the launch gate

**Market size**

**Okay****$229K**

$229K/yr · 148K searches

**Conversion**

**Okay****3.4%**

search→purchase rate — share of searches ending in a sale

**Brand share**

**Okay****80%**

top-5 brand share — brands hold most of the demand

**Competition**

**Bad****71%**

top-5 click share — a locked-up shelf

**Quality gap**

**Bad****4.6★**

avg incumbent rating — lower means beatable quality

**Growth**

**Bad****-35.4%**

90-day search growth — must beat 0% to launch

**Signals**[** Low Review Barrier**](https://flapen.com/research/niches?market=us&signal=low_review_barrier "Top brand's reviews < 500")

## Trend