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TattyBear | Staff 12.5K Views
Mar 11, 2026 4:42 PM

Dewenwils Pipe Heating Cable w/ Built-in Thermostat: 60' $11.90, 30'

$10

$31

67% off
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Dewenwils via Amazon has 30' Dewenwils Pipe Heating Cable w/ Built-in Thermostat for $9.99. Shipping is free w/ Prime or on $35+ orders.

Dewenwils via Amazon also has 60' Dewenwils Pipe Heating Cable w/ Built-in Thermostat for $11.89. Shipping is free w/ Prime or on $35+ orders.

Thanks to Deal Hunter TattyBear & Community Member headman for finding this deal.

Specs:
  • Input Voltage: 110-120V, 50-60Hz, 7W/ft
  • Power Rating: Total Wattage 21W (Only for heating wire)
  • Length: Heating Cable Length 30ft / 60ft, Lead Cord Length 2ft
  • Temperature Switch: 3℃ (37.4℉) on, 10℃ (50℉) off

Editor's Notes

  • About this deal:
    • Please see the original post for additional details & give the WIKI and additional forum comments a read for helpful discussion.
  • About this store:

Original Post

Community Notes
About the Poster
Deal Details
Community Notes
About the Poster
Dewenwils via Amazon has 30' Dewenwils Pipe Heating Cable w/ Built-in Thermostat for $9.99. Shipping is free w/ Prime or on $35+ orders.

Dewenwils via Amazon also has 60' Dewenwils Pipe Heating Cable w/ Built-in Thermostat for $11.89. Shipping is free w/ Prime or on $35+ orders.

Thanks to Deal Hunter TattyBear & Community Member headman for finding this deal.

Specs:
  • Input Voltage: 110-120V, 50-60Hz, 7W/ft
  • Power Rating: Total Wattage 21W (Only for heating wire)
  • Length: Heating Cable Length 30ft / 60ft, Lead Cord Length 2ft
  • Temperature Switch: 3℃ (37.4℉) on, 10℃ (50℉) off

Editor's Notes

  • About this deal:
    • Please see the original post for additional details & give the WIKI and additional forum comments a read for helpful discussion.
  • About this store:

Original Post

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20 Comments

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Mar 11, 2026 5:24 PM
190 Comments
Joined Dec 2007
headmanMar 11, 2026 5:24 PM
190 Comments
Great price for one this length, the 60' is $11.98.
1
Mar 11, 2026 7:18 PM
191 Comments
Joined Nov 2017
beyondwatchesMar 11, 2026 7:18 PM
191 Comments
just bought, don't know where I'm gonna put it though 🤷🏻
Last edited by beyondwatches March 11, 2026 at 12:22 PM.
3
Mar 11, 2026 7:50 PM
371 Comments
Joined Jul 2017
RelikMar 11, 2026 7:50 PM
371 Comments

Our community has rated this post as helpful. If you agree, why not thank

This says

  • Power Rating: Total Wattage 21W (Only for heating wire )
  • Length: Heating Cable Length 30ft, Lead Cord Length 2ft
That's 21 watts over 30 feet = 0.7 watts per foot. For comparison, an EasyHeat Pipe Heating Cable on Amazon is 7 watts per foot (the industry standard), 10 times as much power. 210 watts for a 30 foot cable.

This is incredibly low wattage and I certainly wouldn't consider this for a 30 ft pipe run. You would have to spiral wrap this over a 4-6 ft pipe length for it to have any utility and success at all. Use this at your own risk - there's a reason it's $10. The EasyHeat 30' cable is $33 and it actually will heat/protect 30 feet of pipe - you are told not to spiral wrap it because it will produce too much heat per foot.
Last edited by Relik March 11, 2026 at 01:15 PM.
2
3
Mar 11, 2026 7:55 PM
10.5K Comments
Joined Nov 2013
AdelleyMar 11, 2026 7:55 PM
10.5K Comments
We had something similar attached to our kitchen pipes.

When we had our kitchen remodel the person said these things were illegal and they don't even sell them anymore. Dafuq was he talking about?
Mar 11, 2026 8:06 PM
613 Comments
Joined Feb 2023

This comment has been rated as unhelpful by Slickdeals users.

Mar 11, 2026 8:12 PM
371 Comments
Joined Jul 2017
RelikMar 11, 2026 8:12 PM
371 Comments

Our community has rated this post as helpful. If you agree, why not thank

Quote from Adelley View quoted comment :
We had something similar attached to our kitchen pipes.

When we had our kitchen remodel the person said these things were illegal and they don't even sell them anymore. Dafuq was he talking about?
Edit: I'm noticing that many cables they have seem to be stating 21 watts of power usage. The input voltage point on this cable says 7W/ft but that conflicts with their other statements.

I'll hope that this uses 7 watts per foot for purchasers sake, but these are big oversights that tell me the brand is questionable.

Update: There are some very bad reviews people. I'm unable to attach the photos of the charred house. It's unfortunate to see so many people putting their property at risk. I wouldn't take this product for free.

Amazon Customer - Almost burnt my house down - avoid at all cost

I installed this product correctly, following all of the manufacturers instructions. The cable was not overlapping and was more than 13mm away from any "combustible" surface, which is the wood siding in this instance. Within five hours of installation and use, it caught fire and spread to the exterior of our home. We smelled smoke coming under the laundry room door, and opened the door to find the room, which is on the interior wall of where the cable was installed, completely filled with this smoke. We immediately extinguished the fire, but the product had already done damage to our homes exterior, ruined the plumbing into the wall, and filled our house with toxic smoke from burning plastic and insulation. Avoid this product at all costs. After contacting Amazon and waiting on hold multiple times, they dropped my call twice while "I was being connected to the right customer service team"

Mike - 18 FEET OF DESTRUCTION
This melted my my pvc plumbing and nearly started a fire. When I tried to contact product support, I was told by a robot its past its return window. Had to contact Amazon just to get a return started. I'm out over $200 in destroyed plumbing. This cheap one is dangerous. Bought other brands, no problems.
Last edited by Relik March 11, 2026 at 03:43 PM.
5
1
Mar 11, 2026 8:37 PM
1.8K Comments
Joined Sep 2018
gathermewoolMar 11, 2026 8:37 PM
1.8K Comments
Quote from LivelyTree6515 View quoted comment :
No one here turn on heat at home? Wondering why you need this?
The basement of my raised ranch, which is where the water comes in and is distributed, has no heat. In the winter I have to use space heaters in two sections where the piping is. Something like this would be helpful.

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Mar 11, 2026 9:21 PM
116 Comments
Joined Sep 2019
PowerDubsMar 11, 2026 9:21 PM
116 Comments
Quote from LivelyTree6515 View quoted comment :
No one here turn on heat at home? Wondering why you need this?
Garage pipes dummy...
Mar 11, 2026 9:33 PM
172 Comments
Joined Jul 2017
DavidC7604Mar 11, 2026 9:33 PM
172 Comments
Quote from LivelyTree6515 View quoted comment :
No one here turn on heat at home? Wondering why you need this?
pool piping during cold snaps in TX?
Mar 11, 2026 9:50 PM
447 Comments
Joined Feb 2019
late_apexMar 11, 2026 9:50 PM
447 Comments
Quote from PowerDubs View quoted comment :
Garage pipes dummy...
What kind of dummy would have such a setup?
Mar 11, 2026 10:35 PM
96 Comments
Joined Nov 2010
XoCoBrAoXMar 11, 2026 10:35 PM
96 Comments
Quote from Relik View quoted comment :
This says
  • Power Rating: Total Wattage 21W (Only for heating wire )
  • Length: Heating Cable Length 30ft, Lead Cord Length 2ft
That's 21 watts over 30 feet = 0.7 watts per foot. For comparison, an EasyHeat Pipe Heating Cable on Amazon is 7 watts per foot (the industry standard), 10 times as much power. 210 watts for a 30 foot cable.This is incredibly low wattage and I certainly wouldn't consider this for a 30 ft pipe run. You would have to spiral wrap this over a 4-6 ft pipe length for it to have any utility and success at all. Use this at your own risk - there's a reason it's $10. The EasyHeat 30' cable is $33 and it actually will heat/protect 30 feet of pipe - you are told not to spiral wrap it because it will produce too much heat per foot.
Completely disagree with you unless you are in the tundra living in Antarctica.
1
Mar 11, 2026 10:39 PM
371 Comments
Joined Jul 2017
RelikMar 11, 2026 10:39 PM
371 Comments
Quote from XoCoBrAoX View quoted comment :
Completely disagree with you unless you are in the tundra living in Antarctica.
Do you understand basic thermodynamics? I guess not.
2
Mar 11, 2026 10:56 PM
630 Comments
Joined Jan 2015
bookertttMar 11, 2026 10:56 PM
630 Comments
Quote from LivelyTree6515 View quoted comment :
No one here turn on heat at home? Wondering why you need this?
On REALLY cold days….think 10 degrees or less, your oil supply line can freeze up….then you have no heat and with no heat inside plumbing pipes can also freeze.

Keep one on your oil supply line and keep the oil flowing to your burner and keep the heat on.

Can also keep on the bottom of your gutters to hopefully help those from freezing and having complications of ice dams on your roof.

If you don't know about either of these issues, consider yourself lucky.

The watts do seem low for this one and someone else mentioned bad reviews.
Mar 11, 2026 11:29 PM
613 Comments
Joined Feb 2023
LivelyTree6515Mar 11, 2026 11:29 PM
613 Comments
Quote from bookerttt View quoted comment :
On REALLY cold days….think 10 degrees or less, your oil supply line can freeze up….then you have no heat and with no heat inside plumbing pipes can also freeze.Keep one on your oil supply line and keep the oil flowing to your burner and keep the heat on.Can also keep on the bottom of your gutters to hopefully help those from freezing and having complications of ice dams on your roof.If you don't know about either of these issues, consider yourself lucky.The watts do seem low for this one and someone else mentioned bad reviews.
I see, I always winterize my outside pipes before winter and this is why we have basements. If we do lose heat/electricity during winter, drip your faucets.

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Mar 12, 2026 12:41 AM
783 Comments
Joined Apr 2016
anotherbobleesMar 12, 2026 12:41 AM
783 Comments
I like to buy these and sew em into heated blankets. Then I put them on Etsy. People love them
2

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