---
title: "Rheem Flammable Vapor Sensor — $85K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/tools-home-improvement/rheem-flammable-vapor-sensor"
last_updated: "2026-08-06T01:56:41.802Z"
locale: en
meta:
description: "Niche score 53/100 · $85K/yr market · 19K searches/yr. A concentrated shelf (top 5 take 100% of clicks) keeps it on the watch list. Data updated Jul 2026."
"og:description": "Niche score 53/100 · $85K/yr market · 19K searches/yr. A concentrated shelf (top 5 take 100% of clicks) keeps it on the watch list. Data updated Jul 2026."
"og:title": "Rheem Flammable Vapor Sensor — $85K/yr Amazon US Niche (2026) - Flapen"
---
# **rheem flammable vapor sensor**
**Worth a look**
Shows searches that convert (23.3% search→purchase), but a concentrated shelf (top 5 take 100% of clicks) keeps it on the watch list.
Market size 21Growth 74Conversion 100Competition 0Returns 62Price range 95Avg price 85Brand share 0Review moat 71Quality gap 100
**Conversion**
**Incredible****23.3%**
search→purchase rate — share of searches ending in a sale
**Quality gap**
**Incredible****3.5★**
avg incumbent rating — lower means beatable quality
**Price range**
**Incredible****$15.55–$23.92**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Avg price**
**Great****$19.01**
avg listing price — sweet spot $15–$100
**Growth**
**Good****+58.3%**
90-day search growth — must beat 0% to launch
**Review moat**
**Good****647.6**
avg incumbent reviews — the moat a new listing must climb
**Returns**
**Good****2.5%**
return rate — above 5% kills the launch gate
**Market size**
**Bad****$85K**
$85K/yr · 19K searches
**Competition**
**Bad****100%**
top-5 click share — a locked-up shelf
**Brand share**
**Bad****100%**
top-5 brand share — brand-locked demand
**Signals**[** Quality Gap**](https://flapen.com/research/niches?market=us&signal=quality_gap "Avg rating < 4.0") [** Out of Stock**](https://flapen.com/research/niches?market=us&signal=out_of_stock "OOS rate > 10%")
According to Flapen's Amazon United States niche tracking, rheem flammable vapor sensor is a $85K/yr Amazon United States market (19K searches/yr). The top 5 brands hold 100% of demand. Demand peaks in Jun–Jul–Aug. Verdict: Worth a look — 53/100.
Data updated Jul 29, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **rheem flammable vapor sensor market data**
- **Units sold / yr**
- **4K–5K**
- avg 500–750/product
- **Revenue / yr**
- **$76K–$95K**
- units × avg price
- **Conversion rate**
- **23.3%**
- **Avg BSR**
- **#4,154**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **100%**
- **Out of stock**
- **19.2%**
- **Avg brand age**
- **34 months**
- **Avg seller age**
- **182 days**
## **Competition & brand share**
The top 5 products capture 100% of clicks — a locked-up shelf that new listings rarely crack.
**Brands**
**4 **▼falling
**Sellers**
**29**
**Top-5 brand share**
**100%**
Top 20: 100%
**Top-5 click share**
**100%**
Top 20: 100%
**Open market**
**0%**
- Rheem45% - Holdly39% - BZWBYFY8% - KYJIANY8%
## **Demand & seasonality**
Weekly Amazon search volume, last 100 weeks — +58.3% search growth over the last 90 days.
700500Spike '24Holiday '24Spike '25Prime Day '25Spike '26Prime Day '26 seasonSepDecMarJunAugNovMarMay
Peak months: Jun, Jul, Aug · busiest ÷ quietest = 3.0×
[**Open Trend **](https://flapen.com/research/us/tools-home-improvement/rheem-flammable-vapor-sensor/trend)
## **Top rheem flammable vapor sensor search terms**
- **rheem flammable vapor sensor**8K/yr+56.8%18.2% conv. - **flammable vapor sensor**5K/yr+38.1%13.6% conv. - **sp20172**3K/yr+42.5%23.8% conv. - **sp20172 flammable vapor sensor**3K/yr+161.0%23.1% conv. [**All search terms **](https://flapen.com/research/us/tools-home-improvement/rheem-flammable-vapor-sensor/search-terms)
## **Top rheem flammable vapor sensor 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%15%$13K30%$26K45%$38K60%$51K1101001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 5 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**Rheem SP20172 Flammable Vapor FV Sensor Kit White 6.7X2.7X9.4 inches**Rheem**$23.92**4.7★3,031 rev](https://www.amazon.com/dp/B00G2DL8M8) [2**SP20172 Flammable Vapor FV Sensor Kit | AP13447-3 - 25VS | Water Heater Flammable Vapor Sensor Replacement Parts for Rheem Ruud Richmond FVIR Water Heaters**Holdly**$17.89**4.4★173 rev](https://www.amazon.com/dp/B0DN6WT6GY) [3**SP20172 Flammable Vapor Detection Kit Replacement AP13447-3 25VS FVIR Safety Component Compatible with Rheem Ruud & Richmond Gas Water Heaters Includes Cap**KYJIANY**$18.13**3.5★19 rev](https://www.amazon.com/dp/B0GCYRBRPM) [4**SP20172 Water Heater Flammable Vapor Sensor Kit Compatible with Rheem Ruud Richmond and Other FVIR Water Heater Comes with AP13447-3 FV Sensor AP13450-3 Cap Plug**BZWBYFY**$15.55**2.9★13 rev](https://www.amazon.com/dp/B0G61B3MPS) [5**2026 Upgrade SP20172 Water Heater Flammable Vapor Sensor Kit Compatible with Rheem Ruud Richmond and Other FVIR Water Heater Comes with AP13447-3 FV Sensor AP13450-3 Cap Plug**BZWBYFY**$19.55**2.0★2 rev](https://www.amazon.com/dp/B0H4H9SW76)
### **Newest**
by launch date
[**2026 Upgrade SP20172 Water Heater Flammable Vapor Sensor Kit Compatible with Rheem Ruud Richmond and Other FVIR Water Heater Comes with AP13447-3 FV Sensor AP13450-3 Cap Plug**BZWBYFY**$19.55**2 rev1mo ago](https://www.amazon.com/dp/B0H4H9SW76) [**SP20172 Flammable Vapor Detection Kit Replacement AP13447-3 25VS FVIR Safety Component Compatible with Rheem Ruud & Richmond Gas Water Heaters Includes Cap**KYJIANY**$18.13**19 rev7mo ago](https://www.amazon.com/dp/B0GCYRBRPM) [**SP20172 Water Heater Flammable Vapor Sensor Kit Compatible with Rheem Ruud Richmond and Other FVIR Water Heater Comes with AP13447-3 FV Sensor AP13450-3 Cap Plug**BZWBYFY**$15.55**13 rev7mo ago](https://www.amazon.com/dp/B0G61B3MPS) [**SP20172 Flammable Vapor FV Sensor Kit | AP13447-3 - 25VS | Water Heater Flammable Vapor Sensor Replacement Parts for Rheem Ruud Richmond FVIR Water Heaters**Holdly**$17.89**173 rev1y ago](https://www.amazon.com/dp/B0DN6WT6GY) [**Rheem SP20172 Flammable Vapor FV Sensor Kit White 6.7X2.7X9.4 inches**Rheem**$23.92**3,031 rev14y ago](https://www.amazon.com/dp/B00G2DL8M8)
### **Trending**
90-day click momentum
[**2026 Upgrade SP20172 Water Heater Flammable Vapor Sensor Kit Compatible with Rheem Ruud Richmond and Other FVIR Water Heater Comes with AP13447-3 FV Sensor AP13450-3 Cap Plug**BZWBYFY**$19.55**2.0★**▲ 171%**](https://www.amazon.com/dp/B0H4H9SW76) [**SP20172 Flammable Vapor Detection Kit Replacement AP13447-3 25VS FVIR Safety Component Compatible with Rheem Ruud & Richmond Gas Water Heaters Includes Cap**KYJIANY**$18.13**3.5★**▲ 71%**](https://www.amazon.com/dp/B0GCYRBRPM) [**SP20172 Water Heater Flammable Vapor Sensor Kit Compatible with Rheem Ruud Richmond and Other FVIR Water Heater Comes with AP13447-3 FV Sensor AP13450-3 Cap Plug**BZWBYFY**$15.55**2.9★**▲ 18%**](https://www.amazon.com/dp/B0G61B3MPS) [**SP20172 Flammable Vapor FV Sensor Kit | AP13447-3 - 25VS | Water Heater Flammable Vapor Sensor Replacement Parts for Rheem Ruud Richmond FVIR Water Heaters**Holdly**$17.89**4.4★**— 3%**](https://www.amazon.com/dp/B0DN6WT6GY) [**Rheem SP20172 Flammable Vapor FV Sensor Kit White 6.7X2.7X9.4 inches**Rheem**$23.92**4.7★**▼ 10%**](https://www.amazon.com/dp/B00G2DL8M8)
## **What buyers say about rheem flammable vapor sensor**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Advertised Vs Actual Product**24%
*“As advertised”*
**Sensor**13%
*“The sensor was so easy to change, works perfect”*
**Value For Money**10%
*“Less than half the cost too”*
**Size-Overall**8%
*“It fit perfectly”*
**Maintenance And Repair**7%
*“It's easy to replace”*
**Quality-Overall**6%
*“The parts feel well made”*
**Compatibility-Overall**6%
*“Compatible and fit well”*
**Functionality-Overall**6%
*“This one worked great”*
**Assembly/Installation**4%
*“Installing ourselves saved us over $200”*
**Efficiency**4%
*“It works perfect”*
### **What buyers complain about **
**Functionality-Overall**32%
*“Did not work”*
**Durability**10%
*“Failed in less than 2 months”*
**Quality-Overall**8%
*“after market JUNK”*
**Design-Overall**7%
*“Poorly engineered component”*
**Defective Material/Parts**7%
*“many other sellers have defective products”*
**Measurement/Reading Accuracy**7%
*“Tested with multimeter - Result: OL”*
**Size-Overall**3%
*“This DOES NOT fit the RHEEM water heater”*
**Advertised Vs Actual Product**3%
*“Deceptive inaccurate product description - DOES NOT FIT RHEEM”*
**Heating**3%
*“Until you replace the sensor, it refuses to light the burner to heat any more water, so this is not something you can ignore and fix later”*
**Touch/Button Controls**3%
*“will not allow your control module to work”*
### **Top return reasons **
**Functionality-Overall**32%
**Defective Material/Parts**24%
**Value For Money**10%
**Compatibility-Overall**9%
**Measurement/Reading Accuracy**5%
**Advertised Vs Actual Product**4%
**Size-Overall**3%
**Maintenance And Repair**3%
**Heating**2%
**Product Condition**1%
## **Common questions**
- **Is rheem flammable vapor sensor profitable to sell on Amazon United States?**
- The niche generates $85K/yr across 5 tracked products. 2 of 3 products launched in the last 360 days are still selling. 90-day search growth is +58.3%. Flapen's verdict: Worth a look (53/100).
- **How competitive is the rheem flammable vapor sensor niche?**
- 4 brands and 29 sellers compete. The top 5 products take 100% of clicks and top 5 brands hold 100% of demand.
- **What do buyers complain about in rheem flammable vapor sensor?**
- Top complaints mined from reviews: Functionality-Overall, Durability, Quality-Overall. The return rate is 2.5%.
- **When does demand for rheem flammable vapor sensor peak?**
- Demand peaks in Jun–Jul–Aug; the busiest month runs 3.0× the quietest.
- **What does it cost to enter the rheem flammable vapor sensor niche?**
- Listings span $15.55–$23.92; the average listing price is $19.01 (sweet spot $15–$100). The average incumbent carries 648 reviews — the moat a new listing must climb.
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