tankless water heater natural gas
Worth a lookShows a thin review moat (161 avg reviews), but pricing outside the sweet spot ($664.28 avg) keeps it on the watch list.
Review moat
Great161.05avg incumbent reviews — the moat a new listing must climb
Market size
Great$1.6M$1.6M/yr · 545K searches
Competition
Great32%top-5 click share — an open shelf
Quality gap
Great4.3★avg incumbent rating — lower means beatable quality
Returns
Great1.9%return rate — above 5% kills the launch gate
Brand share
Good70%top-5 brand share — brands hold most of the demand
Growth
Bad-24.0%90-day search growth — must beat 0% to launch
Conversion
Bad0.4%search→purchase rate — share of searches ending in a sale
Avg price
Bad$664.28avg listing price — sweet spot $15–$100
Price range
Bad$115.32–$1772.73cheapest to priciest tracked listing — scored on the share inside $15–$100
According to Flapen's Amazon United States niche tracking, tankless water heater natural gas is a $1.6M/yr Amazon United States market (545K searches/yr). The top 5 brands hold 70% of demand. Demand peaks in Jan–Nov. Verdict: Worth a look — 54/100.
Data updated Jul 29, 2026 · scored weekly · How we score niches
tankless water heater natural gas market data
- Units sold / yr
- 3K–3K
- avg 0–100/product
- Revenue / yr
- $1.7M–$2.0M
- units × avg price
- Conversion rate
- 0.4%
- Avg BSR
- #162
- Page quality
- 0%
- Prime
- 71%
- Sponsored
- 100%
- Out of stock
- 10.8%
- Avg brand age
- 36 months
- Avg seller age
- 168 days
Competition & brand share
Clicks spread well past the top 5 (32% combined) — an open shelf where new products get seen.Brands
19 rising
Sellers
45
Top-5 brand share
70%
Top 20: 100%
Top-5 click share
32%
Top 20: 70%
Open market
25%
- Rinnai35%
- Rheem13%
- NOVIEEX9%
- FOGATTI6%
- APUS6%
- MIZUDO5%
Demand & seasonality
Weekly Amazon search volume, last 104 weeks — -24.0% search growth over the last 90 days.Peak months: Jan, Nov · busiest ÷ quietest = 1.7×
Top tankless water heater natural gas search terms
- tankless water heater gas149K/yr
- rinnai tankless water heater66K/yr
- gas water heater62K/yr
- gas tankless water heater41K/yr
- navien tankless water heater54K/yr
- tankless gas water heater23K/yr
- gas hot water heater18K/yr
- water heater gas23K/yr
- navien npe-240a210K/yr
- gas tankless water heater indoor11K/yr
Top tankless water heater natural gas 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 24 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
NEW Rinnai RX199iN Condensing Smart Sense Natural Gas or Propane Tankless Water Heater Indoor or Outdoor Water Heater Up to 11.1 GPM 199 000 BTU
Rinnai$1471.854.6★143 rev
Tankless Water Heater Novieex On Demand Water Heater Natural Gas Up to 4.3 GPM 100 000 BTU Instant Hot Water Heater with LED Display Indoor Installation 2-4 Point Use for Family Bathroom Kitchen
NOVIEEX$275.684.0★61 rev
FOGATTI Tankless Water Heater Natural Gas Outdoor On Demand CSA Certified
FOGATTI$628.704.1★160 rev
NEW Rinnai RXP199iN Smart Sense Condensing Tankless Water Heater 199 000 BTU Up to 11.1 GPM Natural Gas or Propane Indoor/Outdoor Installation Built-In Recirculation Pump
Rinnai$1772.734.6★120 rev
Rheem RTG-70DVLN-3 High Efficiency Non-Condensing Indoor Tankless Natural Gas Water Heater 7.0 GPM 160 000 BTUs
Rheem$778.664.6★59 rev
Newest
by launch date
MIZUDO 199 000 BTU Natural Gas Tankless Water Heater Max 10.3 GPM Indoor
MIZUDO$1036.15162 rev
FOGATTI Tankless Water Heater Natural Gas Outdoor On Demand CSA Certified
FOGATTI$632.17160 rev
Natural Gas Tankless Water Heater 4.21GPM 16L Indoor Constant propane water heater Instant Hot Natural Gas Water Heater with Fahrenheit Digital Display Multi-Protection
forimo$184.4423 rev
Tankless Water Heater Novieex On Demand Water Heater Natural Gas Up to 4.3 GPM 100 000 BTU Instant Hot Water Heater with LED Display Indoor Installation 2-4 Point Use for Family Bathroom Kitchen
NOVIEEX$275.6861 rev
Tankless Water Heater Novieex On Demand Water Heater Natural Gas Up to 3.6 GPM 86 000 BTU Instant Hot Water Heater with LED Display Indoor Installation 2-3 Point Use for Family Bathroom Kitchen
NOVIEEX$210.2410 rev
Trending
90-day click momentumMIZUDO 199 000 BTU Natural Gas Tankless Water Heater Max 10.3 GPM Indoor
MIZUDO$1036.154.5★
Tankless Water Heater Novieex On Demand Water Heater Natural Gas Up to 3.6 GPM 86 000 BTU Instant Hot Water Heater with LED Display Indoor Installation 2-3 Point Use for Family Bathroom Kitchen
NOVIEEX$210.243.4★
Westinghouse Tankless Water Heater Gas Indoor 7.9 GPM 180 000 BTU
Westinghouse$839.364.5★
Natural Gas Tankless Water Heater 4.21GPM 16L Indoor Constant propane water heater Instant Hot Natural Gas Water Heater with Fahrenheit Digital Display Multi-Protection
forimo$184.444.4★
Rheem RTG-84XLN-3 High Efficiency Non-Condensing Outdoor Tankless Natural Gas Water Heater 8.4 GPM 180 000 BTUs
Rheem$873.094.8★
What buyers say about tankless water heater natural gas
What buyers praise and complain about, mined from review topics.What buyers love
“Easy install”
“Good for the money”
“Awesome quality”
“Very effective”
“As described”
“It feels durable”
“easy to use”
“Saves money and space”
“compact design fits my home perfectly”
“Very little noise”
What buyers complain about
“However, I wouldnt recommend doing this installation myself”
“Leaks from inside”
“output wasnt sufficient for my homes demands”
“Garbage”
“Seems crazy expensive for what it is”
“it will break”
“✔ Installation instructions could be little clearer”
“I received a used tankless water heater poured out water when I opened the caps”
“he said the system is too small for our home”
“makes nearly no noise. not that that matters”
Top return reasons
Common questions
- Is tankless water heater natural gas profitable to sell on Amazon United States?
- The niche generates $1.6M/yr across 55 tracked products. 15 of 18 products launched in the last 360 days are still selling. 90-day search growth is -24.0%. Flapen's verdict: Worth a look (54/100).
- How competitive is the tankless water heater natural gas niche?
- 19 brands and 45 sellers compete. The top 5 products take 32% of clicks and top 5 brands hold 70% of demand.
- What do buyers complain about in tankless water heater natural gas?
- Top complaints mined from reviews: Assembly/Installation, Leak-Proof, Functionality-Overall. The return rate is 1.9%.
- When does demand for tankless water heater natural gas peak?
- Demand peaks in Jan–Nov; the busiest month runs 1.7× the quietest.
- What does it cost to enter the tankless water heater natural gas niche?
- Listings span $115.32–$1772.73; the average listing price is $664.28 (sweet spot $15–$100). The average incumbent carries 161 reviews — the moat a new listing must climb.