40' PRO-Tect DIY Plug-in Heating Cable for Pipes, Constant Wattage (7W/ft), 120V

Part Number: PTC120-7W-040
This support page provides publications, manuals, specifications, support articles, and common support questions

Common Support Questions (16)

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Specifications (25)

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Common Support Questions

No, as long as it's properly installed. However, improper installation, use, and/or maintenance of electrical heating cable can cause fires, electric shock, and/ or frozen pipes.

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Heat trace, heat tape, or heating cable for pipes is typically an electric heating cable that can be attached to the pipe which helps keep non-flowing water pipes in poorly insulated perimeter walls flowing despite harsh winter temperatures.

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Unfortunately there's no set answer for this because it depends on many factors such as the diameter of the pipes, the installation density of the heating cables, the outdoor temperature, the installation of thermal insulation sleeves, etc.

There are too many variables to provide an accurate answer. Even though this product is designed to keep pipes from freezing, it is not designed to thaw pipes. If your pipe has frozen with the heat tape installed and energized, please check the placement of the built-in thermostat and verify that the insulation has been properly installed and waterproofed.

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Yes, it can be used for both application types to prevent pipes from freezing and bursting during cold weather.

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By attaching a heating cable to the exterior of a pipe, it will transfer the heat to the pipe to prevent frozen pipes. And with the use of pipe insulation the heat will be evenly spread and won't dissipate as quickly.

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The highest surface temperature of the heating cable for pipes can be between 70°F and 80°F.

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No, heating cable for pipes will use a relatively low amount of power—anywhere from 21W to 210W (depending on length).

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While the entire product is warrantied for 2 years, it is equipped with a built-in thermostat that has a service life of approximately 100,000 activations. The service life of the constant wattage heating cable itself is 20 years.

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No. Do not run constant wattage heating cable through walls, ceilings, or floors. The constant wattage cable must be installed 1/2“ away from combustible material.

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Only use on water pipes with a length greater than 3‘. Maximum pipe diameter of 1.5“. Never use a cable that is longer than the pipe. Never install constant wattage pipe heat on plastic/PVC/PEX piping unless it is filled with water at all times. Never install on pipes heated above 149°F/65°C such as steam lines.

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Never spiral heating cable on pipes. Apply the constant wattage cable straight along the bottom of horizontal pipe, or the "weather side" of verticle pipe. For pipes 1“-1.5“ in diameter, apply two separate cables on opposite sides of the pipe. Please refer to the installation manual for further information.

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Heating cable may remain on the pipe year round, but WarmlyYours recommends turning off or disconnecting the power when air temperatures remain above 50°F/10°C. Always inspect the heating cable and its power connection at the beginning of the heating season.

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Constant wattage cable cannot be used on plastic pipe unless it is filled with water at all times. Never spiral or wrap heating cable around pipes. Keep the heating cable straight along the pipe. In order to obtain even heat distribution, WarmlyYours recommends wrapping plastic pipe with aluminum foil before applying the heating cable. Never use more than ½“ of fiberglass or other non-flammable pipe insulation because this can cause the cable to overheat and cause a serious fire hazard or electrical shock.

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Use good quality electrical tape with a minimum 176°F/80°C temperature rating at 5.9“ (15cm) intervals. Never use metal binding to secure heating cable to pipe.

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As the names imply, constant wattage cable uses fixed wattage output per linear foot and does not automatically adjust in response to temperature changes. Self-regulating cable is manufactured with a resistance matrix placed between its 2 buss wires that varies the ohms resistance per linear foot to automatically adjust in response to temperature changes. Learn more about this in our blog Self-Regulating vs. Constant Wattage Heating Cables.

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Ice Shield is 120V and outputs 5W/ft, and is designed for roof and gutter deicing applications.
PRO-Tect is 120V and outputs 7W/ft, and is designed for pipe freeze protection applications.

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Publications and Manuals



Amps 2.33 A
Cable Construction Twin conductor
Cable Type Constant Wattage
Conductor Insulation XLPE
Connection Method Plug-in
Ohms 51.4 Ω
Outer Insulation PVC
Plug-Type NEMA 5-15 (Type B)
Plug-in Cable Diameter 0.31″ / 8mm
Plug-in Cord Length 2′
Voltage 120 V
Watts 280 W
Watts Per Linear Ft. 7 W

Warranty / Certifications

Approvals cUL Listed, CSA Listed, and cETLus Listed
Warranty 2-year warranty

Product Dimensions

Cable Cross Section 0.31″ x 0.23″ / 8mm x 6mm
Heating Cable Length 40′
Splice Dimensions 0.56″ x 6.69″ x 0.94″ / 1.4cm x 17.5cm x 2.4cm


Country of Origin (COO) China


Maximum Pipe Diameter 1 ½″ (3.81cm)
Minimum Bend Radius 1″ (2.54cm)
Minimum Installation Temperature 15°F (-10°C)


SKU PTC120-7W-040
UPC (GTIN-12) 881308072094


Thermostat Built-in: ON setpoint 37.4°F (3°C), OFF setpoint 50°F (10°C)


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