Is duramax block heater cord profitable to sell on Amazon United States?

The niche generates $45K/yr across 9 tracked products. 0 of 7 products launched in the last 360 days are still selling. 90-day search growth is -93.1%. Flapen's verdict: Skip it (37/100).

How competitive is the duramax block heater cord niche?

9 brands and 12 sellers compete. The top 5 products take 76% of clicks and top 5 brands hold 76% of demand.

What do buyers complain about in duramax block heater cord?

Top complaints mined from reviews: Compatibility-Overall, Size-Overall, Quality-Overall. The return rate is 4.9%.

What does it cost to enter the duramax block heater cord niche?

Listings span $8.51–$54.44; the average listing price is $39.33 (sweet spot $15–$100). The average incumbent carries 25 reviews — the moat a new listing must climb.

duramax block heater cord

Skip it

Soft demand (-93.1% this quarter) — this niche doesn't clear our bar today.

Review moat

Incredible25

avg incumbent reviews — the moat a new listing must climb

Avg price

Incredible$39.33

avg listing price — sweet spot $15–$100

Price range

Great$8.51–$54.44

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

Quality gap

Good4.4★

avg incumbent rating — lower means beatable quality

Brand share

Okay76%

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

Conversion

Okay3.6%

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

Returns

Okay4.9%

return rate — above 5% kills the launch gate

Competition

Bad76%

top-5 click share — a locked-up shelf

Market size

Bad$45K

$45K/yr · 31K searches

Growth

Bad-93.1%

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

Signals Low Review Barrier

According to Flapen's Amazon United States niche tracking, duramax block heater cord is a $45K/yr Amazon United States market (31K searches/yr). The top 5 brands hold 76% of demand. Verdict: Skip it — 37/100.

Data updated Jul 9, 2026 · scored weekly · How we score niches

duramax block heater cord market data

Units sold / yr: 1K–2K; avg 0–100/product
Revenue / yr: $49K–$59K; units × avg price
Conversion rate: 3.6%
Avg BSR: #96
Page quality: 0%
Prime: 100%
Sponsored: 100%
Out of stock: 0.8%
Avg brand age: 15 months
Avg seller age: 242 days

Competition & brand share

The top 5 products capture 76% of clicks — a locked-up shelf that new listings rarely crack.

Brands

9 rising

Sellers

Top-5 brand share

76%

Top 20: 100%

Top-5 click share

76%

Top 20: 100%

Open market

17%

DZQPPC25%
XYgdhqpt19%
UAUSE13%
Kozlira11%
IXMGA8%
Minoway7%
Open — no brand owns it (3 brands, 17%)

Demand

Weekly Amazon search volume, last 27 weeks — -93.1% search growth over the last 90 days.

Open Trend

Top duramax block heater cord search terms

block heater cord silverado4K/yr -89.4%0.8% conv.
845646864K/yr -91.8%5.4% conv.
2023 duramax block heater cord3K/yr -91.9%0.9% conv.
gm block heater cord3K/yr -90.6%3.0% conv.
duramax block heater cord4K/yr -95.7%1.3% conv.
2022 duramax block heater cord4K/yr -95.7%4.3% conv.
gmc block heater cord2K/yr -92.7%0.0% conv.
2020 duramax block heater cord3K/yr -95.5%2.1% conv.
2021 duramax block heater cord3K/yr -97.7%0.0% conv.

All search terms

Top duramax block heater cord 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.

Beatable (≤4.3★) Contested Strong incumbent (>4.7★)

All 9 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

84564686 Engine Block Coolant Heater Cable Cord for Chevy Silverado 1500/LD/LTD 2019-2023 for Buick Cadillac 2019-2022 for GM Chevy Silverado 2500/3500 HD Duramax Trucks 2020-2024

DZQPPC$48.854.4★21 rev

XYgdhqpt 84564686 Block Heater CableEngine Coolant Heater Cable Compatible With 2019-2023 Chevrolet Silverado 1500/LD/LTD 2020-2024 GM Chevy Silverado 2500/3500 HD Duramax Trucks 19-22 Buick Cadillac

XYgdhqpt$50.672.9★74 rev

84564686 Block Heater CableEngine Coolant Heater Cable Compatible with Chevrolet 2019-2023 Silverado 1500/LD/LTD 2020-2024 GM 2500/3500 HD Duramax Trucks for Buick Cadillac 2019-2022

UAUSE$50.834.6★26 rev

Kozlira 84564686 Engine Block Coolant Heater Cable Cord Compatible with Chevy Silverado 1500/LD/LTD 2019-2023 Silverado 2500/3500 HD Duramax Trucks 2020-2024

Kozlira$54.444.2★38 rev

IXMGA 84564686 90 Inches Engine Coolant Heater Cord

IXMGA$39.194.6★21 rev

Newest

by launch date

84564686 Engine Coolant Heater Cable Cord for Chevy Silverado 1500/LD/LTD 2019-2023 Silverado 2500/3500 HD Duramax Trucks 2020-2024 GMC Sierra 2019-2024

haizusai$34.434 rev

6mo ago

84564686 Block Heater Cable Cord Compatible with Chevy Silverado 1500/LD/LTD 2019-2023 Buick Cadillac 2019-2022 GM Chevy Silverado 2500/3500 HD Duramax Trucks 2020-2024

Hzsyserth$8.512 rev

6mo ago

MINOWAY 84564686 Engine Coolant Heater Cable Compatible with 2019-2024 Chevy Silverado 1500 2500 3500 HD DuramaxEngine Block Heater Cord Replace Aceessory fit for GMC Sierra Yukon Buick Cadillac

Minoway$49.2220 rev

7mo ago

84564686 Engine Block Coolant Heater Cable Cord for Chevy Silverado 1500/LD/LTD 2019-2023 for Buick Cadillac 2019-2022 for GM Chevy Silverado 2500/3500 HD Duramax Trucks 2020-2024

DZQPPC$48.8521 rev

10mo ago

84564686 Block Heater CableEngine Coolant Heater Cable Compatible with Chevrolet 2019-2023 Silverado 1500/LD/LTD 2020-2024 GM 2500/3500 HD Duramax Trucks for Buick Cadillac 2019-2022

UAUSE$50.8326 rev

10mo ago

What buyers say about duramax block heater cord

What buyers praise and complain about, mined from review topics.

What buyers love

Size-Overall24%

“Fits good”

Advertised Vs Actual Product20%

“Works as advertised”

Quality-Overall9%

“The quality is solid”

Efficiency6%

“Works well”

Value For Money5%

“Great price”

Flexibility4%

“it is flexible and manageable”

Socket/Port/Plug3%

“Plugs in as it should”

Heating3%

“It provides reliable power to the engine block heater”

Durability3%

“durable”

Assembly/Installation3%

“Easy to install”

What buyers complain about

Compatibility-Overall13%

“Doesnt fit 2022 Chevy Silverado 2500 HD”

Size-Overall12%

“Doesnt fit or work”

Quality-Overall10%

“Junk”

Connectivity-Overall9%

“Doesn't stay plugged in”

Heating5%

“Block heater cable”

Advertised Vs Actual Product5%

“False advertising”

Thickness4%

“Cable is thick”

Functionality-Overall3%

“Still did not work after taping”

Design-Overall3%

“This is terrible design”

Socket/Port/Plug2%

“Plug not very strong/tight”

Top return reasons

Size-Overall26%

Compatibility-Overall19%

Connectivity-Overall17%

Defective Material/Parts11%

Socket/Port/Plug10%

Heating5%

Functionality-Overall4%

Advertised Vs Actual Product4%

Quality-Overall2%

Add-Ons/Attachments1%

Common questions

Is duramax block heater cord profitable to sell on Amazon United States?: The niche generates $45K/yr across 9 tracked products. 0 of 7 products launched in the last 360 days are still selling. 90-day search growth is -93.1%. Flapen's verdict: Skip it (37/100).
How competitive is the duramax block heater cord niche?: 9 brands and 12 sellers compete. The top 5 products take 76% of clicks and top 5 brands hold 76% of demand.
What do buyers complain about in duramax block heater cord?: Top complaints mined from reviews: Compatibility-Overall, Size-Overall, Quality-Overall. The return rate is 4.9%.
What does it cost to enter the duramax block heater cord niche?: Listings span $8.51–$54.44; the average listing price is $39.33 (sweet spot $15–$100). The average incumbent carries 25 reviews — the moat a new listing must climb.