When the temperature outside begins to drop below freezing, drain lines from your home, cottage, or business become susceptible to freezing. Once a drain line is frozen, sinks, showers, sewage, floor drains and other pipes can back up, while outdoor drain pipes, downpipes, and gutters may fill with ice. This can result in water damage to your property and can cause pipes to burst. A burst drain pipe can cause significant damage from sewage or water, and replacing it can be costly, especially when pipes are located within finished walls, floors, or underground.

A frozen drain line can easily be prevented with a self-regulating heating cable approved for wet locations and direct earth burial

What Causes Drains to Freeze?

Even when indoor spaces are well-heated and insulated, plumbing connected to exterior drain lines remains vulnerable to freezing. If drain pipes are not buried below the frost line or are exposed to freezing temperatures along any part of their length, they are at risk of freezing. Roof and gutter drain pipes and other surface water drain pipes are especially prone to ice blockages due to fluctuating temperatures around freezing and poor drainage design. In buildings with uninsulated or drafty basements, drain lines may freeze more slowly than fully exposed outdoor pipes but remain susceptible to freezing in extreme cold.

How to Stop Drain Lines from Freezing

• Identify drain lines that are at risk, such as sewer lines, furnace condensate drain lines, sump pump drain lines, French drains and more
• Reposition pipes under the frost line at all points along their length and improve the drainage design
• If drain pipes can not be buried below the frost line, they can be protected with a heating cable system designed for each application
• Insulate pipes equipped with heating cable systems for added energy efficiency and performance; only self-regulating systems, such as those offered by Heat-Line, are safe to insulate

Common Drain Lines Susceptible to Freezing

Identifying vulnerable areas is the first step in coming up with a proactive solution to prevent frozen drain lines. Below is a list of some common drains that are most likely to require drain line freeze protection:

• sewer drain lines
• condensate drain lines
• sump pump drain lines
• garage drain lines
• downspout drain lines
• French drains
• channel drains

Frozen condensate drain line.

Prevent Frozen Drain Lines with Heat-Line Heating Cables

Heat-Line offers a range of products specifically designed to prevent drain lines from freezing, utilizing advanced self-regulating technology with approvals for common drain pipe applications such as direct earth burial, wet locations, and black or grey water systems. In contrast, many heat tape products from hardware stores use constant-wattage heating, maintaining a set temperature once plugged in regardless of ambient conditions, which is less energy-efficient and has limited, less-safe applications. These products often lack proper approvals for drain pipe use, have shorter lifespans, and require frequent replacement.

The Advantages of Heat-Line Self-Regulating Heating Cable Systems for Drain Pipes:

• Safe and energy-efficient
• Approvals for various drain pipe application requirements 
• Long term, reliable solution
• Easy to install
• Can be installed with insulation and control devices

Choosing the Right Heat-Line Product for Your Drain Line:

Product: Retro-DWS

Applications: Non-pressurized sewer drain lines

Retro-DWS is the only in-pipe system designed specifically for sewer drain pipes. This job-ready, self-regulating heating cable system provides a safe and reliable solution for preventing freeze-ups in non-pressurized sewer lines. It incorporates a tubular heater that is safe for black water applications. Installation is straightforward, as it requires no excavation and comes with fittings for standard sewer drain pipes. Additionally, it is safe for use with both plastic and metal pipes, even when they are dry, which is often the case with sewer drain lines. The system is ordered to length to protect the full length of the sewer pipe right through to the septic tank or town sewer line.

Product: Retro-FM

Applications: Pressurized sewer drain lines

Retro-FM is an in-pipe freeze protection system specifically designed for pressurized sewer drain pipes known as force mains. This pre-assembled, job-ready heating cable system features a self-regulating tubular design that is approved for black water applications, rated for pressures up to 230 PSI and is safe for both plastic and metal pipes, even when the pipes are dry. Installation is straightforward, requiring no excavation, and the system includes fittings suitable for standard force main drain pipes.

Product: Paladin for Pipe

On-Pipe Applications: Pressurized and non-pressurized sewer drain lines, condensate drain lines, sump pump drain lines, garage drain lines, downspout drain lines and channel drains

In-Pipe Applications: Sump pump drain lines, garage drain lines containing non-harsh substances, downspout drain lines, French drains and channel drains

Paladin is a self-regulating heating cable system designed for both external and internal applications. Compatible with a range of pipe types and sizes, it will not overheat and can be safely installed on plastic and metal pipes, even when dry. With approvals for direct earth burial and wet locations, it is ideal for in-pipe and on-pipe drain applications.

Furnace condensate lines, in particular, can be vulnerable to freezing temperatures as they run directly to the exterior of your home or building. Paladin for Pipe is one option. We recommend checking out our article on How to Prevent Furnace Condensate Lines From Freezing to learn more about protecting furnace condensate lines.

For drain lines exceeding 240 feet, EXT-R offers the same features as Paladin for Pipe while accommodating longer applications of up to 550 feet.

Product: Retro-Line

Applications: Sump pump drain lines

Retro-Line is a self-regulating in-pipe heating cable system designed to install directly inside drain pipes without the need to excavate. Safe, reliable and long-lasting freeze protection for new or existing sump pump lines. The cable can be pushed in most pipes up to 300 feet with a maximum length of 550 feet. The system is supplied with plumbing components for a watertight entry, a self-regulating heating cable factory terminated and a power lead.

Product: Retro-Line Mini

Applications: Small diameter sump pump and condensate drain lines

Retro-Line Mini is an in-pipe heating cable system engineered to go inside small-diameter drain lines. It easily installs within pipes as small as half-inch ID without the need to excavate.  Retro-Line Mini comes equipped with fittings for a watertight entry, along with a heating cable and end seal that can be safely installed inside condensate lines containing carbonic acid.

Product: EXT-T

Applications:  Garage drain lines, condensate drain lines

The EXT-T series is a specialized self-regulating heating cable system designed to protect pipes from freezing in environments exposed to harsh substances. The self-regulating heating cable features a fluoropolymer outer jacket that provides chemical resistance against aggressive organic compounds and corrosive materials. This makes it particularly suitable for drain lines that contain harsh substances, such as garage drain lines and condensate drain lines.

With the various options for preventing frozen drain lines, we recommend speaking with one of our experts to find the best solution for your unique situation. Heat-Line systems are safe, long-lasting, and reliable during severe winter temperatures. All systems are significantly more energy efficient and safe to use than standard hardware store heat tape. Remove the worry of problems caused by a frozen drain line and enjoy peace of mind while you experience running water year-round.