Name: In-Pipe Heating Cable for Drain Lines | YeloDeer
Brand: YeloDeer
SKU: Y-IW-10
Price: 32.99 USD
Availability: OutOfStock

Overview

Compact In-Pipe Heating Cable for Drain Lines, Condensate Lines & Low-Pressure Wastewater Pipes

YeloDeer IPHC-DMi is a compact self-regulating in-pipe heating cable designed for open drain lines, HVAC condensate drains, high-efficiency furnace drain pipes, roof drainage pipes, gray water discharge lines, low-pressure septic lines, and small sewer or wastewater drain applications where freezing can block water flow during winter.

This cable is inserted directly into the pipe opening without complicated fittings. Its slim 0.3 × 0.19 in cable profile makes it easier to route through smaller drain openings, while the corrosion-resistant fluoropolymer outer jacket helps protect the cable in wet and wastewater environments.

It is a practical freeze protection solution for customers who need a smaller, flexible, and cost-effective drain line heating cable for open or low-pressure drain systems.

Quick Fit Snapshot

Compact Drain Cable Designed for open drains, condensate drains, furnace drains, and low-pressure wastewater pipes.

3W/ft at 50°F Self-regulating heating output helps protect smaller drain lines from freezing.

Open Pipe Insertion Push directly into accessible pipe openings without sealed fittings in many applications.

Not for Potable Water Not intended for drinking water lines or sealed pressurized water supply pipes.

Key Benefits

Prevents Ice Clogs Helps reduce freezing and ice buildup in open drain, condensate, and low-pressure wastewater lines.

Slim Cable Profile Approx. 0.3 × 0.19 in cable size helps with insertion into smaller open drain routes.

Self-Regulating Technology Automatically adjusts heat output as surrounding temperature changes.

Wet-Environment Jacket Corrosion-resistant fluoropolymer outer jacket helps protect the cable in drain environments.

6 ft Power Cord Included power cord helps connect to a nearby protected 120V outlet.

Insulation Compatible Can be used with suitable pipe insulation to improve freeze protection in exposed areas.

Best For

HVAC & Furnace Drains

Condensate Drains Furnace Drain Pipes Attic Condensate Utility Drains

Open Drain Lines

Basement Drains Garage Drains Roof Drains Downspout Drains

Low-Pressure Wastewater

Gray Water Lines Low-Pressure Septic Drains Small Sewer Drains Outdoor Drainage

Cold-Weather Problem Areas

Cabins Garages Attics Basements Outdoor Pipes

Important Before You Order

This product is for open or low-pressure drain applications.

It is not intended for sealed pressurized water supply pipes, potable drinking water lines, or 1/2 in PEX water supply pipes.

If your pipe must remain sealed after the cable is inserted, or if you are working with a larger sewer or septic line that needs a sealed entry point, choose YeloDeer Heavy-Duty Sewer Pipe Heating Cable instead.

Your pipe is an open drain or low-pressure drain line The cable can be inserted directly through an accessible opening The pipe route is not blocked, collapsed, or unknown The cable will not be crushed, cut, or exposed to moving parts You have measured the drain section that needs freeze protection Fish tape is available if the pipe run is over 20 ft The outlet is close enough for the 6 ft power cord or a suitable extension cord Outdoor plug and outlet connections can be protected from moisture

Self-Regulating Does Not Mean Auto-Off

This cable automatically adjusts heat output based on surrounding temperature. It produces more heat in colder areas and reduces output in warmer areas.

However, self-regulating does not mean the cable turns itself completely off. To stop heating completely, unplug the cable or use a compatible thermostat.

For automatic seasonal operation and energy savings, use this cable with a YeloDeer Pipe Heat Tape Thermostat, sold separately.

Length Selection Reminder

The heating cable cannot be cut or shortened in the field.

Choose a cable length based on the section of pipe that needs freeze protection. For pipes longer than 20 ft, fish tape or a similar guide tool may help with installation.

If you need a special length, contact yelodeer@yelodeer.com before ordering.

Complete Pipe Heating Solutions

YeloDeer compact in-pipe heating cable for open drain and low-pressure wastewater pipes

For more details on the differences between YeloDeer pipe heating solutions, read How to Choose the Right Heat Cable for Your Pipes.

YeloDeer compact in-drain heating cable for condensate and open drain freeze protection Self-regulating drain line heating cable for winter ice clog prevention Compact in-pipe heating cable benefits for open drains and low-pressure wastewater pipes YeloDeer drain heating cable with corrosion-resistant fluoropolymer jacket In-pipe heating cable installation for HVAC condensate and furnace drain pipes Compact self-regulating cable for roof drain downspout and gray water discharge lines YeloDeer IPHC-DMi drain pipe heating cable product details Open drain freeze protection heating cable for cabins garages attics and basements YeloDeer in-drain heating cable application and compatibility overview

Applications & Compatibility

Recommended Applications

YeloDeer IPHC-DMi is designed for small to medium open drain and low-pressure wastewater applications where ice buildup may block flow during winter.

HVAC & Utility Drains

HVAC Condensate Furnace Drains Attic Condensate Utility Drain Lines

Building Drainage

Basement Drains Garage Drains Roof Drainage Downspout Drains

Low-Pressure Wastewater

Gray Water Pipes Septic Drain Lines Open Sewer Drains Outdoor Drainage

Cold-Exposure Areas

Cabins Garages Attics Basements Dirt Road Drains

Pipe Compatibility

This cable can be used with many common drain pipe materials when the route is open, accessible, and large enough for the cable to pass without force.

PVC Drain Pipes ABS Drain Pipes Metal Drain Pipes Condensate Drain Tubing Low-Pressure Wastewater Pipes Compatible Septic Drain Lines

The cable size is approximately 0.3 × 0.19 in, making it suitable for many smaller open drain applications.

Before installation, confirm that the pipe has enough internal space for the cable and that the cable can pass through the route without being forced.

Open Drain vs Sealed Pipe Applications

Choose IPHC-DMi If You need a compact cable for smaller open drain lines, HVAC condensate drains, furnace drains, gray water discharge, or low-pressure open drain freeze protection.

Choose Heavy-Duty Sewer Cable If You need a sealed pipe installation, 2 in and larger sewer or septic pipes, built-in GFCI plug protection, or a more robust 5W/ft solution.

When Not to Use This Product

Pressurized drinking water supply lines
Sealed pressurized pipe systems
1/2 in PEX water supply pipes
Pipes with blocked, collapsed, or unknown internal conditions
Pipes with very sharp bends where the cable cannot pass safely
Pipes where the cable could be crushed, cut, or damaged
Applications requiring a sealed pipe entry point

For sealed wastewater applications, choose the Heavy-Duty Sewer Pipe Heating Cable.

For pressurized potable water lines, choose YeloDeer standard in-pipe heating cable or Y-fitting in-pipe heating cable.

Specifications & Sizing

Product Specifications

Product Type	Compact self-regulating in-pipe heating cable for drain lines
Model	IPHC-DMi
Application	Open drain lines, condensate drains, furnace drains, gray water discharge, and low-pressure wastewater pipes
Heating Output	3W/ft at 50°F / 10°C
Low-Temperature Output	Approximately 6W/ft at 32°F / 0°C or below
Voltage	120V
Cable Type	Self-regulating heating cable
Outer Jacket	Corrosion-resistant fluoropolymer jacket
Cable Size	Approx. 0.3 × 0.19 in
Power Cord Length	6 ft
Minimum Bend Radius	1 in at 32°F / 0°C
Maximum Stable Cable Temperature	60°C / 140°F
Recommended Use	Open or low-pressure drain applications
Standard Lengths	5 ft to 75 ft
Custom Lengths	Available by request
Field Cutting	Not allowed

How to Choose the Right Length

Measure the section of drain pipe that needs freeze protection. Start from the cable entry point and measure to the farthest area where freezing may occur.

The location of the pipe opening The length of the exposed or freezing section Whether the pipe has bends Whether the pipe is open or sealed Whether the cable can be inserted easily Whether the outlet is close enough for the 6 ft power cord Whether fish tape may be needed for longer pipe runs Whether insulation is needed for exposed sections

Do not cut or shorten the heating cable.

For pipes over 20 ft, use fish tape or a similar guide tool to help insert the cable smoothly. If you are between two sizes, choose carefully based on the pipe layout.

Total Cable Length Reminder

The listed size refers to the heating cable length. Each product also includes a 6 ft power cord.

For example, a 5 ft heating cable has an approximate total cable length of 11 ft; a 15 ft heating cable has an approximate total cable length of 21 ft; a 50 ft heating cable has an approximate total cable length of 56 ft.

Custom Lengths

If you need a length that is not listed, contact us at yelodeer@yelodeer.com.

Please include required heating length, pipe diameter, pipe material, application type, entry point photos, whether the pipe is open or sealed, and any bends or difficult sections in the pipe route.

Short custom lengths, such as 3 ft, may be possible, but they may cost more than standard sizes due to custom production requirements. In many cases, the standard 5 ft option is the most cost-effective choice.

Power and Amperage Note

Power draw depends on cable length and surrounding temperature.

For example, a 50 ft cable uses approximately 1.25A at 50°F / 10°C and approximately 2.5A in colder conditions near 32°F / 0°C or below.

For longer cables or custom applications, confirm your outlet and circuit capacity before installation.

Installation & Accessories

Basic Installation Overview

YeloDeer IPHC-DMi is designed for simple insertion into open drain lines and low-pressure drain systems.

Typical Installation Steps

Identify the section of pipe that needs freeze protection.
Confirm that the pipe is open, accessible, and not blocked.
Insert the heating cable directly into the pipe opening.
For pipe runs over 20 ft, use fish tape or a similar guide tool if needed.
Avoid forcing the cable through sharp bends or restricted areas.
Keep the cable inside the pipe section that needs freeze protection.
Insulate exposed pipe sections if needed.
Plug the cable into a properly protected 120V outlet.
Use a thermostat if automatic temperature control is desired.

Important Installation Notes

Do Not Cut or Splice The cable is not field-cuttable and should not be shortened or spliced.

Do Not Force Cable Do not force the cable through blocked, collapsed, sharp, or restricted pipe sections.

Maintain Bend Radius Keep the minimum bend radius at 1 in at 32°F / 0°C.

Use Open Drains Only Do not use this product in sealed pressurized water supply pipes or potable drinking water lines.

Protect Outdoor Power Protect the outlet and plug from rain, snow, and standing water.

Consider Professional Help For complex sewer, septic, or sealed drain applications, professional installation is recommended.

Electrical & Drain Installation Notice: Keep plugs, outlets, and extension cord connections dry and protected from rain, snow, and standing water.

Do not install the cable in blocked, collapsed, unknown, or mechanically unsafe pipe routes. Do not use where the cable may be cut, crushed, pinched, or damaged.

Using Fish Tape

For longer pipe runs, especially over 20 ft, fish tape can help guide the cable through the pipe.

Make sure the fish tape is longer than the heating cable and that the pipe route is clear before installation. Do not pull or force the cable through tight bends.

Using Pipe Insulation

This heating cable can be used with suitable pipe insulation, such as drain line insulation, to improve freeze protection.

Attic Condensate Drains Outdoor Exposed Drains Basement Drain Lines Crawl Space Drains Roof Drainage Pipes Wind-Exposed Pipes

Using an Extension Cord

If the pipe is far from the outlet, a suitable extension cord may be used.

For safer operation, use an extension cord that is 16AWG or thicker and suitable for the environment where it will be used.

Do not place plugs, connectors, or extension cord connections in standing water, snow, or direct rain exposure.

Temperature Controller Recommendation

The cable can operate without a thermostat, but a thermostat is recommended for automatic operation and energy savings.

A compatible thermostat can help turn the system on only when needed, reduce unnecessary energy use, avoid manual plugging and unplugging, set a preferred operating temperature range, and improve convenience during winter.

The thermostat is sold separately.

FAQ & Resources

Additional Product Questions

Can this cable be used with pipe insulation?

Yes. This cable can be used with suitable drain line insulation, such as foam or Armaflex-style insulation, especially for attic condensate drains, exposed outdoor drain pipes, and other areas where freezing air may affect the pipe.

Can this cable be used in an empty pipe?

Yes. The self-regulating cable adjusts heat output based on surrounding temperature. It can be used in drain lines that may be empty most of the time, such as condensate drains or intermittent wastewater drains.

Can the cable touch itself or overlap?

Because this is a self-regulating heating cable, it can safely touch itself in normal installation conditions.

However, avoid sharp bends, tight knots, crushing, or forcing the cable into restricted spaces.

Can this cable be used in a 4 in ABS or PVC drain pipe?

Yes, it may be used in a 4 in ABS or PVC drain pipe if the pipe is open, accessible, and the cable can be inserted safely.

However, for larger 4 in drainage systems, roof drainage systems, or sealed sewer/septic applications, YeloDeer’s Heavy-Duty Sewer Pipe Heating Cable may be a better choice.

Can this cable be used in a toilet drain line?

It may be used in some larger toilet drain or waste pipe applications if the pipe diameter is suitable and the cable is installed smoothly without sharp bends.

The cable has a smooth outer jacket, which helps reduce the chance of catching debris. However, the pipe should be clear before installation. Do not install the cable in a pipe that is already partially blocked or prone to clogging.

Can this cable be used in a roof drain or downspout drain?

Yes. This product can be used in many roof drain, gutter drain, or downspout drain applications if the drain line is open, the cable route is accessible, and the electrical connection can be protected from moisture.

Can I leave extra cable near the pipe opening?

If the cable is slightly longer than needed, extra cable may be managed carefully near the pipe opening or inside a suitable larger pipe section, as long as it is not sharply bent, crushed, or placed where it may be damaged.

Do not cut the cable.

Is this product suitable for 1/2 in PEX pipe?

No. This product is not recommended for 1/2 in PEX water supply pipes.

For pressurized potable water pipes, use YeloDeer’s potable in-pipe heating cable and confirm the minimum pipe size and fitting opening before ordering.

What should I do if I am not sure which product to choose?

Please email yelodeer@yelodeer.com with pipe type, pipe diameter, required heating length, application photos, whether the pipe is open or sealed, and whether the pipe is for condensate, drain, sewer, septic, or potable water.

Our team can help you choose between IPHC-DMi, the Heavy-Duty Sewer Pipe Heating Cable, and potable in-pipe heating cable options.

Related Resources

For automatic temperature control, use with YeloDeer Pipe Heat Tape Thermostat.
For sealed sewer or septic pipe applications, choose YeloDeer Heavy-Duty Sewer Pipe Heating Cable.
For pressurized potable water lines, choose YeloDeer standard in-pipe heating cable or Y-fitting in-pipe heating cable.
For product selection help, contact yelodeer@yelodeer.com with pipe photos, pipe diameter, required length, and application details.

Real Customer Installations

The installation photos below show how customers use YeloDeer IPHC-DMi compact in-pipe heating cable for drain line freeze protection in real applications.

Common installation examples include HVAC condensate drains, furnace drain lines, roof drainage pipes, open drain lines, low-pressure wastewater pipes, septic drain lines, and outdoor drainage systems.

Every drain system is different. Pipe diameter, entry point, pipe condition, bends, outlet location, and exposure to freezing air can all affect installation.

Before Ordering, Please Check

What type of drain line you have Whether the pipe is open or sealed The pipe diameter The length of pipe that needs freeze protection Whether the pipe has sharp bends or restricted areas Whether fish tape is needed for installation Whether the pipe should be insulated Whether the outlet and plug can be protected from moisture

Real customer installation of compact in-pipe heating cable for drain line freeze protection Customer HVAC condensate or low-pressure drain heating cable installation Customer open drain freeze protection with YeloDeer compact in-drain heating cable

If you are unsure which cable length or model to choose, send your installation photos and pipe details to yelodeer@yelodeer.com. Our team can help review your application before you order.

In Drain Pipe Heating Cable

Common Questions

This FAQ section is based on real customer questions about drain line, condensate drain, and low-pressure wastewater freeze protection.

If you are not sure whether this product fits your pipe, please contact us at yelodeer@yelodeer.com with your pipe diameter, required length, application, and installation photos.

IPHC-DMi is the compact version for open drain and smaller low-pressure drain applications.

It is best for:
• HVAC condensate drain lines
• High-efficiency furnace drain pipes
• Open drain pipes
• Gray water discharge lines
• Smaller sewer or septic low-pressure drain lines
• Applications where the cable can be inserted directly into an open pipe

The Heavy-Duty Sewer Pipe Heating Cable is better for:
• 2 in and larger sewer or septic pipes
• Closed or sealed drain applications
• Larger roof drainage or underground drain systems
• Applications requiring a built-in GFCI plug
• More severe winter freeze protection needs

If your pipe must remain sealed after installation, choose the heavy-duty sewer pipe model instead of IPHC-DMi.

No. This product is designed for drain lines, condensate drains, gray water discharge, sewer drains, septic low-pressure lines, and other non-potable drain applications.

It is not intended for pressurized drinking water supply pipes.

For potable water lines, please choose YeloDeer’s standard in-pipe heating cable or Y-fitting in-pipe heating cable.

Yes. Custom lengths may be available.

However, standard sizes are usually more cost-effective. The standard minimum length is 5 ft, and short custom lengths such as 3 ft may cost more due to custom production requirements.

If you need a custom length, email yelodeer@yelodeer.com with your required heating length, pipe diameter, application, and photos.

No. This cable is factory terminated and cannot be cut, shortened, or spliced in the field.

Cutting the cable will damage the product and create an electrical safety risk.

Please choose the correct length before ordering. If you are unsure, contact us before purchase.

Measure from the pipe entry point to the farthest section that needs freeze protection.

Also consider:
• The exposed freezing section
• Bends in the pipe
• Whether the pipe is easy to access
• Whether the pipe is longer than 20 ft and may need fish tape
• Whether some extra length is needed near the entry point

The listed length is the heating cable length. Each cable also includes a 6 ft power cord.

For example, a 5 ft heating cable has an approximate total cable length of 11 ft.

Yes. This cable can be used in drain lines that may be empty most of the time, such as HVAC condensate drains, furnace drain pipes, or intermittent wastewater drains.

The self-regulating cable adjusts heat output based on surrounding temperature, helping reduce overheating risk while providing freeze protection when temperatures drop.

Self-regulating means the cable adjusts its heat output as temperature changes.

It does not mean the cable turns completely off by itself.

If the cable is plugged in, it can still consume power even when less heat is needed.

A thermostat helps turn the system on and off based on temperature, which can reduce energy use and make winter operation more convenient.

Yes, but the electrical connection must be protected from moisture.

For outdoor use, plug the cable into a properly protected outlet and use a weatherproof in-use cover. Do not place the plug, connector, outlet, or extension cord connection in standing water, snow, or direct rain exposure.

If the outlet is far from the pipe, use a suitable extension cord that is 16AWG or thicker.

Many customers can install IPHC-DMi themselves if the drain line is open, accessible, and easy to route.

Professional help is recommended if:
• The pipe route is unknown
• The pipe is underground or hard to access
• The pipe may be blocked or collapsed
• The installation requires electrical work
• The pipe must be sealed after installation
• The application involves a larger sewer or septic system

For sealed or more complex installations, choose the heavy-duty sewer pipe heating cable and consult a qualified professional.

Questions & Answers

Have a Question?

Ask a Question

Can this be used in conjunction with armorflex drain line insulation for attic condensate drain line?

Yes, the product you asked can be used in conjunction with armorflex drain line insulation for attic condensate drain line.
I have a 4 inch ABS drain pipe running from my roof down into my basement. It’s an interior drainage system for the roof. Is this product suitable to run through that 4 inch ABS pipe? This application runs through roof and walls and needs to be rated as such.

This In-Pipe Heating Cable for Drain Lines is indeed suitable for use in your 4-inch ABS drain pipe.
However, for a 4-inch diameter pipe , we highly recommend our Heavy-Duty Sewer Pipe Heating Cable as a more optimal choice.
This heavy-duty model offers:
Safer Operation: It is equipped with a built-in GFCI (Ground Fault Circuit Interrupter), which prevents overheating and ensures reliable protection for your drainage system.
Better Freeze Protection: It features higher power output, delivering more effective anti-freezing performance to keep your drain line clear in cold conditions.
do you offer a iphc-dmi cable that is 3feet long, if so what is the sku number so i can order one?

Hi Sir,
Thank you for your interest in our in-pipe heating cable!
Our standard minimum length for this product is 5ft, and we do offer custom 3ft lengths. However, please note that custom orders come with a significant premium due to the specialized production and setup costs involved.
For the most cost-effective solution, we highly recommend going with the 5ft option. The extra length can simply be coiled up and will not affect the performance or safety of the cable at all.
If you still prefer the 3ft custom length, please let us know and we can provide you with a quote and the corresponding order number.
Best regards,
do you sell a 3ft long heat cable if so what would the order number be?

Hi Robert,

Thank you for your interest in our in-pipe heating cable!

Our standard minimum length for this product is 5ft, and we do offer custom 3ft lengths. However, please note that custom orders come with a significant premium due to the specialized production and setup costs involved.

For the most cost-effective solution, we recommend going with the 5ft option. The extra length can simply be coiled up and will not affect the performance or safety of the cable at all.

Feel free to contact us -happy to help!

Best regards,
total lenght of a 5 ft iphc-dmi cable

The total length of the 5ft iphc-dmi cable is 11 ft: 5ft heat cable and 6ft power cord.
what is the width dimension of the iphc-dmi at the tip of the cable, and what the total lenght of a 3ft heat cable

Dear Robert,
Thanks for reaching out!
The width dimensin of the IPHC-DEI at the tip of the cable is 0.3*019 inch.
The total length of the entire cable is9 ft: 3ft heat cable and 6ft power cord.
Feel free to contact us if you have any other question.
Best reagrds,
Can I use an extension cord with this product? My pipe is 15 feet from the outlet! Or should I buy a longer piece and let the tape lay on the ground ? Thank you

Hi Sir,

Thanks for your question about our in-pipe heating cable!

For your setup, the most practical and safe approach is to use an extension cord, with one important specification:
- We recommend using an extension cord that is 16AWG or thicker. This ensures it can safely handle the electrical load of the heating cable without overheating.
Feel free to contact us if you have anyother questions-happy to help.

Best regards,
what is the bend radius of this product and can it touch beside itself and or overlap

Hello，
Thank you for your question.
The minimum bend radius of this product is 1 inch at 32°F (0°C).
As this is a self-regulating heating cable, it is designed to safely touch itself and can be wrapped or overlapped without risk of overheating.
Please let us know if you need any additional technical details.
Best regards,
Is there a maximum amperage?

Hi there,
Thanks for your question about the maximum amperage of our In-Water Heating Cable (https://yelodeer.com/collections/in-pipe-heating-cable/products/in-water-heating-cable). Let’s break this down clearly with calculations based on the cable’s self-regulating performance and your 50ft length example:
First, a quick recap of the cable’s core specs (from our product details):
- At 50°F (10°C): Heat output = 3W/ft
- At 32°F (0°C) or below: Heat output adjusts to 6W/ft (self-regulating to prevent freezing)
- Rated voltage = 120V (standard for this model)
Amperage is calculated using the formula: Amperage (A) = Total Power (W) ÷ Voltage (V)
1. Amperage at 50°F (10°C) (for 50ft cable)
Total power at 10°C = 50ft × 3W/ft = 150WAmperage = 150W ÷ 120V = 1.25A
2. Maximum Amperage (at 32°F/0°C or below, for 50ft cable)
When temperatures drop to 0°C or lower, the cable’s self-regulating technology increases heat output to 6W/ft—this is the highest power mode, so it also gives the maximum amperage.Total power at 0°C or below = 50ft × 6W/ft = 300WMaximum amperage = 300W ÷ 120V = 2.5A
In short, for a 50ft cable:
- Normal amperage (10°C) = 1.25A
- Maximum amperage (0°C or below) = 2.5A
This aligns with the cable’s design, its self-regulating feature ensures amperage only increases when needed (to fight freezing) and stays within safe limits for standard 120V circuits.
If you have a different cable length or need further clarifications, just let us know!
Do you have an in pipe heater for 1/2" pex pipe?

Hello Michael，
Thanks for your question! So, our current in-pipe heaters actually don’t work for 1/2" PEX pipes—they need pipes that are 3/4" or larger. Unfortunately, we don’t have one that fits 1/2" right now.
Could you let me know where you’re using such a small pipe? Maybe a quick photo would help too—you can send it to our email yelodeer@yelodeer.com.
That way, we can keep it in mind for future development. We’d love to make something that works for your needs!
Thanks and regards，
Can you get a 150ft heating cable

Thank you for reaching out! A 150ft heating cable can be custom-made for you. If you agree, please send us a message at yelodeer@yelodeer.com so we can better assist you.
Looking forward to your response!

Best regards,
If used in a toilet drain from house above the ground15ft will toilet paper hook on it and clog drain

We have had customers use this product in toilet drain pipes, and we haven’t received any clogging complaints so far. However, please consider the size of your drain pipe. Our product dimensions are 7.9*4.9mm（0.3*0.19in）, and the outer sheath is quite smooth. If the heating cable is not bent in the pipe, the chance of clogging is low.
Regarding toilet paper, it should dissolve in water. As long as no fabric, plastic bags, or long hair are flushed, regular toilet paper shouldn’t cause a blockage.
I need to put this inside a 4" pvc pipe that my gutter goes into my question is at the end of the pipe the pipe is exposed to the outside with water just pooling up there will this be a issue

Of course, you can install the heating cable inside the 4" PVC pipe.

In-Pipe Heating Cable for Drain Lines | YeloDeer