5/8 heater hose
Worth a lookShows a sweet-spot price point ($24.80 avg), but soft demand (-3.7% this quarter) keeps it on the watch list.
Avg price
Incredible$24.80avg listing price — sweet spot $15–$100
Conversion
Great10.3%search→purchase rate — share of searches ending in a sale
Price range
Great$8.69–$76.74cheapest to priciest tracked listing — scored on the share inside $15–$100
Review moat
Great328.05avg incumbent reviews — the moat a new listing must climb
Returns
Good2.3%return rate — above 5% kills the launch gate
Market size
Okay$220K$220K/yr · 86K searches
Brand share
Okay80%top-5 brand share — brands hold most of the demand
Competition
Okay65%top-5 click share — leaders hold, buyers still browse
Growth
Bad-3.7%90-day search growth — must beat 0% to launch
Quality gap
Bad4.6★avg incumbent rating — lower means beatable quality
According to Flapen's Amazon United States niche tracking, 5/8 heater hose is a $220K/yr Amazon United States market (86K searches/yr). The top 5 brands hold 80% of demand. Verdict: Worth a look — 50/100.
Data updated Jul 9, 2026 · scored weekly · How we score niches
5/8 heater hose market data
- Units sold / yr
- 8K–10K
- avg 500–750/product
- Revenue / yr
- $198K–$248K
- units × avg price
- Conversion rate
- 10.3%
- Avg BSR
- #676
- Page quality
- 0%
- Prime
- 95%
- Sponsored
- 68%
- Out of stock
- 0.0%
- Avg brand age
- 44 months
- Avg seller age
- 200 days
Competition & brand share
The top 5 products take 65% of clicks — established leaders, but buyers still shop beyond them.Brands
12 rising
Sellers
24
Top-5 brand share
80%
Top 20: 100%
Top-5 click share
65%
Top 20: 100%
Open market
14%
- EVIL ENERGY39%
- Gates14%
- SATUGUOJI12%
- YGDMD9%
- VehiMata6%
- VKQTS6%
- Open — no brand owns it (6 brands, 14%)
Demand & seasonality
Weekly Amazon search volume, last 104 weeks — -3.7% search growth over the last 90 days.No pronounced peak months · busiest ÷ quietest = 1.6×
Top 5/8 heater hose search terms
- 5/8 heater hose78K/yr
- 5 8 heater hose3K/yr
- 5/8 coolant hose5K/yr
Top 5/8 heater hose 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 19 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
EVIL ENERGY 5/8 Heater Hose Coolant Radiator Straight 100PSI SAE 20R3 10FT Black
EVIL ENERGY$27.314.8★928 rev
Gates 28491 Safety Stripe Standard Straight Heater Hose-6 Length Inner Diameter 5/8
Gates$15.084.7★1,864 rev
5FT ID 5/8 (16mm) Heater Hose Coolant Radiator Straight Temperature Reinforced Silicone Tubing Rupture Pressure 232 Psi With 5 Clamps 4MM Thick for Vehicle Cooling Systems(blue)
SATUGUOJI$16.874.7★61 rev
5Ft ID 5/8 Heater Hose Silicone Radiator Hose with 650PSI Rupture Pressure for Water/Gas Transportation Professional Car Accessories Coolant Hoses for Vehicle Cooling Systems (5/8 5FT)
YGDMD$13.134.6★160 rev
EVIL ENERGY 5/8 Heater Hose 10FT Coolant Radiator Hose With 10PCS Clamps Straight 100PSI SAE 20R3 Black
EVIL ENERGY$28.774.7★111 rev
Newest
by launch date
5Ft 5/8 Heater Hose for Cars Silicone Car Coolant Hose for Transferring Water/Air Straight & Cuttable Car Radiator Hoses Vehicle Accessories Working Pressure 250PSI (5/8In 5Ft)
IHOTDER$11.5517 rev
5FT ID 5/8 (16mm) Heater Hose Coolant Radiator Straight Temperature Reinforced Silicone Tubing Rupture Pressure 232 Psi With 5 Clamps 4MM Thick for Vehicle Cooling Systems(blue)
SATUGUOJI$16.8761 rev
9.84Ft Heater Hose for Cars Silicone Flexible Radiator Hose as Air/Water Transfer Paths Straight Car Radiator Coolant Hoses Car Accessories Working Pressure 60PSI (5/8)
Junecarp$11.657 rev
Outus 5/8 ID Heater Hose 50FT EPDM Rubber Black Heater Hose 85PSI Working Pressure for Automotive Radiator/Heating Systems
Outus$63.935 rev
Outus 5/8 ID Silicone Heater Hose 25ft Roll Coolant Radiator Straight 75 Psi Pressure Reinforced High Temperature for Water/gas Transportation for Vehicle Cooling Systems(Blue)
Outus$76.7447 rev
Trending
90-day click momentum5Ft 5/8 Heater Hose for Cars Silicone Car Coolant Hose for Transferring Water/Air Straight & Cuttable Car Radiator Hoses Vehicle Accessories Working Pressure 250PSI (5/8In 5Ft)
IHOTDER$11.555.0★
5FT ID 5/8 (16mm) Heater Hose Coolant Radiator Straight Temperature Reinforced Silicone Tubing Rupture Pressure 232 Psi With 5 Clamps 4MM Thick for Vehicle Cooling Systems(blue)
SATUGUOJI$16.874.7★
10 Ft Car 5/8 Heater Hose with ID 16mm & OD 24mm Straight Car Coolant Hose for Water/Coolants/Antifreeze Essential Cars Coolant Radiator Hoses with Clamps Cars Accessories
VKQTS$12.384.0★
9.84Ft Heater Hose for Cars Silicone Flexible Radiator Hose as Air/Water Transfer Paths Straight Car Radiator Coolant Hoses Car Accessories Working Pressure 60PSI (5/8)
Junecarp$11.654.6★
Outus 5/8 ID Heater Hose 50FT EPDM Rubber Black Heater Hose 85PSI Working Pressure for Automotive Radiator/Heating Systems
Outus$63.935.0★
What buyers say about 5/8 heater hose
What buyers praise and complain about, mined from review topics.What buyers love
“Good Quality”
“Product is as advertised”
“Perfect fit”
“No leaks”
“Its about as cheap as it gets”
“Adequate Quality heater hose 5/8 Decent replacement for old hose, fit and clamped ok”
“Very flexible and durable”
“Hose works amazing”
“It is very flexible”
“Great product for flushing out coolant system”
What buyers complain about
“Hose not good quality it separated in some parts of the hose”
“Did not fit”
“60 days and leaked out all my cookant”
“It does kink if bend it”
“Misleading pictures”
“The material feels thick”
“I cant even use it”
“Did not fit 2091 F150”
“Feels heavier than the local parts store brand”
“Smells weird”
Top return reasons
Common questions
- Is 5/8 heater hose profitable to sell on Amazon United States?
- The niche generates $220K/yr across 19 tracked products. 2 of 8 products launched in the last 360 days are still selling. 90-day search growth is -3.7%. Flapen's verdict: Worth a look (50/100).
- How competitive is the 5/8 heater hose niche?
- 12 brands and 24 sellers compete. The top 5 products take 65% of clicks and top 5 brands hold 80% of demand.
- What do buyers complain about in 5/8 heater hose?
- Top complaints mined from reviews: Quality-Overall, Size-Overall, Leak-Proof. The return rate is 2.3%.
- When does demand for 5/8 heater hose peak?
- Demand is steady year-round — the busiest month runs 1.6× the quietest.
- What does it cost to enter the 5/8 heater hose niche?
- Listings span $8.69–$76.74; the average listing price is $24.80 (sweet spot $15–$100). The average incumbent carries 328 reviews — the moat a new listing must climb.