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 HC3A Automatic Electric Heat Kit Heating Cables, 3 Feet, Black

Frost King HC3A Automatic Electric Heat Kit Heating Cables, 3 Feet, Black

Product ID: 22699603

Details

Brand
Frost King
Color
Black
Item Weight
8.25 ounces
Material
Fabric
Special Feature
Keeps water to

🔌120V electric heat cable

❄️Protects pipes down to -40°F

🌡️7W/ft power output

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Description

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

ENERGY SMART - 7 watts per foot balances power and efficiency for cost-conscious users.
UNIVERSAL FIT - Designed for both metal and plastic pipes, perfect for any home setup.
PLUG PLAY PROTECTION - Easy installation means no hassle, just reliable warmth.
WINTER PROOF YOUR HOME - Say goodbye to emergency pipe thawing and water damage stress.
FREEZE PROOF CONFIDENCE - Self-regulating heat cable keeps pipes flowing even in brutal cold.

The Frost King HC3A Automatic Electric Heat Kit is a 3-foot, 120V heat cable delivering 7 watts per foot to prevent pipe freezing down to -40°F. Featuring a self-regulating thermostat, it adapts power output to ambient temperature, ensuring energy efficiency and reliable protection for both metal and plastic pipes. Easy to install and trusted by thousands, it’s the essential winter defense for any modern home.

Specifications

ASIN	B000IKSQ8U
Additional Features	Keeps water flowing down to -40 degrees Fahrenheit
Best Sellers Rank	#22,215 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #1 in Pipe Heat Cables
Brand Name	Frost King
Color	Black
Customer Reviews	4.6 4.6 out of 5 stars (6,368)
Global Trade Identification Number	10077578015658
Included Components	Frost King HC03 Automatic Electric Heat Cable Kits, 3ft x 120V x 7 Watts/ft
Item Dimensions	8.75 x 7.5 x 1.25 inches
Item Nype Name	Electric Heat Cable Kit
Item Weight	8.25 ounces
Manufacturer	Frost King
Manufacturer Contact Information	1-800-526-5265
Manufacturer Part Number	HC03
Material Type	Fabric
Model Name	Automatic Electric Heat Cable Kit
Model Number	HC3A
Number of Heating Elements	1
Number of Items	1
UPC	077578015651
Unit Count	1 Piece
Voltage	120 Volts
Wattage	7 watts

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