what are the monthly expense to run

To update Mike's answer for 2022. 7 watts per foot @ 30ft = 210watts. Divide by 1,000 = .21kW x 24 hrs = 5.04 kWh per day x cost of electricity in your area (this ranges from $0.2254 to $0.0937 depending on your state) so it could range anywhere from ~$0.47 to ~$1.14.

Can this be used on pex plastic pipe?

You can use it on plastic pipe if the pipe will always be filled with water, but don't wrap it - just run a straight line. See the Frost King website: http://www.frostking.com/wp-content/uploads/Pipe_heat_cable_trifold.pdf

is it thermostat controlled and if not, at what temperature will it be activated? there is existing pipe insulation can the cable go on top of it?

Frost King HC6A 6 Feet Automatic Electric Heat Cable Kits, Black Keep your pipes from freezing in the winter. With a built-in thermostat, the Frost King Electric Heat Cable Kit automatically keeps your water pipes from freezing. No more frozen pipes! For use on 2 in. metal and plastic water pipes. Keeps water flowing down to -40 degrees Fahrenheit. Plug has a power indicator light.

Is it safe to have the cable wrap the pipe inside a foam pipe insulator cover, or will it melt the foam insulator?

I ABSOLUTELY had it melt foam insulator before. Do NOT overlap it. I have pics of where it burned through foam pipe insulator because I sued contractor for almost catching my home on fire

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Frost King HC30A Automatic Electric Heat Kit Heating Cables, 30 - Feet, Black

Frost King HC30A Automatic Electric Heat Kit Heating Cables, 30 - Feet, Black

Product ID: 11632905

Details

Brand
Frost King
Color
Black
Item Length
360 Inches
Material
Stainless
Voltage
120 Volts

⚡120V power, 7W/ft efficiency

🌡️Operates down to -40°F

🛠️Easy DIY installation

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VT22659

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Details

Brand
Frost King
Color
Black
Item Length
360 Inches

Description

🔥 Stay warm, stay worry-free—freeze-proof your pipes like a pro! 🌡️

EFFORTLESS SETUP - Simple, no-fuss installation means you’re protected without calling in the pros or breaking a sweat.
POWERFULLY EFFICIENT - Delivers consistent 7 watts per foot at 120 volts, balancing energy use with reliable warmth.
TRUSTED TOP RANKED - Join thousands of savvy homeowners who rated it 4.5 stars and propelled it to #1 in Pipe Heat Cables.
FREEZE PROOF CONFIDENCE - Keeps your pipes flowing smoothly even in brutal -40°F temps—never worry about winter damage again.
UNIVERSAL COMPATIBILITY - Designed for both metal and plastic pipes up to 2 inches—versatility that fits your home’s needs.

The Frost King HC30A Automatic Electric Heat Kit is a 30-foot black heating cable engineered to prevent pipe freezing down to -40°F. Operating at 120 volts and 7 watts per foot, it’s compatible with 2-inch metal and plastic residential water pipes. Easy to install and highly rated, it’s the go-to solution for winter-proofing your home’s plumbing.

Specifications

ASIN	B00427COLA
Best Sellers Rank	#22,590 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #1 in Pipe Heat Cables
Brand	Frost King
Brand Name	Frost King
Color	Black
Customer Reviews	4.6 out of 5 stars 6,368 Reviews
Global Trade Identification Number	00077578015736
Included Components	1
Item Length	360 Inches
Item Type Name	Frost King HC30A Automatic Electric Heat Kit Heating Cables, 30 - Feet, Black
Item Weight	1.5 Pounds
Manufacturer	Thermwell Products Co., Inc
Manufacturer Contact Information	1-800-526-5265
Material	Stainless Steel
Material Type	Stainless Steel
Model Number	HC30A
Part Number	HC30A
UPC	077578015736
Unit Count	1.0 Count
Voltage	120 Volts
Warranty Description	No Warranty
Wattage	7 watts

Reviews

S**B

20.02.2026

N**K

21.03.2026

T**E

21.01.2026

H**B

1.01.2025

B**N

31.01.2026

S**E

3.01.2026

D**M

14.03.2026

J**.

16.01.2026

G**I

7.12.2023

E**D

27.05.2025

C**X

27.11.2024

A**R

4.01.2020

J**N

24.02.2022

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