CARAPACE is a high-performance freeze protected water supply pipe that’s suitable for potable water, constructed of virgin high-density polyethylene resins certified for potability, direct earth burial, and free air installations. Engineered as an advanced freeze protection solution, CARAPACE utilizes Heat-Line’s proven self-regulating heat trace cable technology for efficient and reliable performance. CARAPACE is suitable for all rural and municipal installations where new polyethylene pipe and the advanced self-regulating heating cable is required to create an all in one frost protection pipe. CARAPACE offers a cost-effective alternative to blasting and excavating where natural frost protection is not possible. The patented construction of CARAPACE provides superior thermal heat transfer and unsurpassed energy efficiency when combined with thermal insulation and thermostat control.


CARAPACE is available as a job-ready plug-in frost protection pipe with GFCI protection with a 4ft. (1.2m) power lead and is factory finished to length making installation simple, fast, and cost-effective. The need for an electrician to provide on-site power and complex terminations is eliminated. Other power supply options are also available.

The CARAPACE job-ready frost protection pipe system is supplied pre-assembled ready for installation.  To install, simply roll out the pipe and connect using industry-standard plumbing fittings such as Philmac 3G Compression fitting supplied by Heat-Line. CARAPACE is constructed using a high-density NSF STD 14 approved polyethylene pipe for high strength and portability. The self-regulating heating cable is extruded directly onto the outer surface of the frost protection pipe with a thin layer of high-density polythene. The extruded layer provides a protective shell to guard against mechanical injury while ensuring the conductive self-regulating heating cable remains in unyielding contact with the pipe wall. This unique construction makes CARAPACE the only product Heat-Line recommends for use with high pressure and constant pressure water supply systems.

CARAPACE employs the unique and advanced performance of self-regulating heating cable technology. CARAPACE can effectively increase heat and energy output to sections along its length which are cold and simultaneously reduce heat and energy output to sections that are warm. You never have to worry about CARAPACE overheating causing the risk of melting and fire because of the self-regulating heat tracing cable technology. Even in applications where pipes are intended to be dry for short or extended periods of time, CARAPACE will never over-heat or melt the pipe. CARAPACE gives you the peace of mind of reliable freeze protection without the risk. It has become an essential product for homeowners, farmers, and engineers overseeing municipal projects to provide safe and reliable pipe freeze protection.

To further increase the energy efficiency of your CARAPACE frost protection pipe system, it is recommended to add thermal insulation and a thermostat. The additional thermal insulation works to reduce heat loss, and the thermostat allows you to duty cycle your CARAPACE system based on external pipe temperature. Both accessories combined can increase energy efficiency by as much as 80%. In applications where pipes will be exposed to atmospheric (free) air, closed-cell or other approved weatherproof insulation is required. Insulation will help to maintain energy efficiency and cold temperature reliability. Insulation is recommended for use in all new applications; however, any pipe subjected to outside air must be completely insulated to retain the heat within the pipe.

CARAPACE frost protection pipe is a job-ready freeze protected; polyethylene pipe system supplied pre-assembled ready for installation. Application examples include but are not limited to:

  •  Residential water supply lines (lake, river, well, building to building, municipal)
  •  Constant pressure or high-pressure water systems
  •  Municipal residences and commercial buildings
  •  Water supply and sewage delivery systems in mining and exploration camps
  •  Small diameter septic pipes (such as force main)
  •  Residential and commercial sewage and waste water force mains

CARAPACE can be found providing freeze protection in many of the following places:

  • Lake Homes and Cottages
  •  Farm/ Agriculture
  •  Commercial/ Industrial
  •  Construction Sites
  •  Camps and RV’s
  •  Mining and Exploration Camps
  •  Northern Housing Projects
  •  Northern Fishing and Hunter Camps
  •  Extreme Cold Climate Government Research/Naval Bases
  •  And more

CARAPACE is a very versatile product, and as such it can be utilized in many specialized applications. If you feel you have a special or unique application for CARAPACE please contact Heat-Line directly and speak with one of our knowledgeable product specialists.


  • 5 year limited warranty, 10 year extended warranty available
  •  Labour savings’ no need to excavate below the frost line or blast rock
  •  Easily and quickly installed
  •  Will never melt or burn through the water pipe, even if the pipe is dry
  •  Can be fully insulated to increase energy efficiency
  •  Can be used with a variety of control devices including timers and thermostats
  •  Available in 5 ft. (1.5m) increments up to 100 ft. (30m), then in 10 ft. (3m) increments from 100 ft. to 660 ft. (30m – 201m), custom lengths available by request


  • cCSAus approved (Canada and USA)
  •  CSA B137.1 approved
  •  cNSF approved polyethylene drinking water pipe
  •  Manufactured in North America
  •  Approved for direct earth burial
  •  Approved for wet location
  •  Unique construction provides superior heat transfer
  •  Approved for constant pressure systems
  •  Most reliable and energy-efficient system on the market
  •  CARAPACE GFC models simply plug into a 120V or 240V receptacle. No extra electrical work is required [Cord set (hardwire) connected CARAPACE models available upon request]
  •  Product and components meet plumbing, electrical and mechanical requirements
  •  No other product combines the features and offers the flexibility of CARAPACE by Heat-Line


  • cCSAus B137.1 approved (Canada and USA) LR 85446
  •  cNSF 14-61 approved (Canada and USA)
  •  Usage W Canada
  •  Installation Type A USA

Electrical Specifications

  •  Direct earth burial and wet location certified
  •  120V systems – 3 watt/ft (9w/m) at 50°F (10°C) maximum length of 240 ft. (73m)
  •  120V systems – 5 watt/ft (15w/m) at 50°F (10°C) maximum length of 240 ft. (73m)
  •  240V systems – 3 watt/ft (9w/m) at 50°F (10°C) maximum length 660 ft. (201m)
  •  240V systems – 5 watt/ft (15w/m) at 50°F (10°C) maximum length 540 ft. (165m)
  •  120 Volt GFC models – 4 ft. (1.2 m) power supply lead with 27 milliamp ground fault circuit interrupter plug-in device
  •  240 Volt GFC models – 6 ft. (1.8 m) power supply lead with 27 milliamp ground fault circuit interrupter plug-in device
  •  CS models – 6 ft. (1.8 m), 12- 14 AWG SJEOOW supply cord for direct hardwire connection, GFCI must be field installed

Plumbing Specifications

  • Constructed of PE 4710 Resin HDPE
  •  PE 4710 HDPE is 25% stronger than PE 3608
  •  CARAPACE is colour coded blue as per international standard for water service pipes and tubes
  •  1 inch ID (SIDR-9) and 1.25 inch ID (SIDR-9) 200PSI NSF STD 14 polyethylene
  •  1 inch CTS (SODR-9) 250PSI NSF STD 14 polyethylene
  •  CARAPACE is entirely compatible with current fitting and connectors made for HDPE water pipe and tubing including Philmac 3G Compression fittings available from Heat-Line
  •  Suitable for above ground applications when properly insulated
  •  Manufactured in North America

Measuring Recommendations for CARAPACE

Always measure prior to ordering. Do not assume or estimate the length required.

– The CARAPACE system is an advanced water supply pipe and self-regulating heating cable system factory finished and supplied job-ready to a pre-determined length provided at the time of order.

– CARAPACE systems are priced and manufactured in standard lengths of 5 ft. (1.5m) increments up to 100 ft. (30m), then in 10 ft. (3m) increments from 100 ft. to 660 ft. (30m – 201m).

Important Notes:

– There is no way to lengthen the CARAPACE product when on-site; however, with the help of a professional electrician and a Heat-Line CARPACE End Seal Kit a CARAPACE system can be shortened on-site.

– While most CARAPACE systems are manufactured in standard lengths, special lengths of any measurement can also be requested within the maximum lengths allowed. For example, if a 118ft. (36m) system was required, instead of purchasing a 120ft (36.5m) system, a special order could be placed for an exact length of 118ft (36m).

Lake/River Applications

– In a lake and or river installations, the CARAPACE system should start in the heated building or room and end (terminate) in the lake at a minimum total water depth that is greater than the expected depth of surface ice. In some applications, the Carapace system may extend right to the foot valve or submersible pump in the lake.

Well Applications

– In a drilled or dug well application the CARAPACE system should start in the heated building or room and end (terminate) at the well casing.

– In certain dug well applications, depending on the casing diameter and depth, you may be able to run the length of CARAPCE directly into the well casing prior to interfacing to the non-heated water pipe to extend to the foot valve and or pump.

– As in all cases, if you are unfamiliar or uncomfortable with the measuring and/or installation of a Heat-Line product please consult directly with a Heat-Line application specialist or contact a qualified local tradesperson.

– CARAPACE is a very versatile product, and as such it can be utilized in many specialized applications. If you feel you have a special or unique application for CARAPACE please contact Heat-Line directly and speak with one of our knowledgeable product specialists regarding measuring and installation.

CARAPACE is a custom order product, however, in most cases, it can be shipped out within 3 days from time of order. Please call for current availability and lead times.


Included in a CARAPACE job-ready system:

  • Factory finished, HDPE polyethylene water supply pipe and self-regulating heating cable set
  • 120V GFC models: 4 ft. (1.2 m) power supply lead with 27 milliamp ground fault circuit interrupter plug-in device
  • 240V GFC models: 6 ft. (1.8 m) power supply lead with 27 milliamp ground fault circuit interrupter plug-in device
  • CS models: 6 ft. (1.8 m), 14 AWG SJEOOW supply cord for direct hardwire connection, GFCI must be field installed
  • 5 year limited warranty
  • Clear, concise installation and support documentation


CARAPACE Job-Ready Accessories:

HLA-120120V plug-in thermostat (GFC)
120/240V hardwire thermostat with GFCI (CS)
TIMER-120P120V plug-in timer (GFC)
TIMER-240P240V plug-in timer (GFC)
120/240V hardwire timer (CS)
MA-10120/240V GFCI/ELCI (CS)
INSUL-1.00Insulation sleeve for 1 inch ID pipe (1 5/8 inch ID, 6 ft long)
INSUL-1.25Insulation sleeve for 1 1/4 inch ID pipe (1 7/8 inch ID, 6 ft long)
INSUL-2.00Insulation sleeve for 2 inch ID pipe (2 5/8 inch ID, 6 ft long)
HLP-TAPETape for insulation sleeves (100 ft)
CR-CESSCARAPACE end seal kit
WARRANTYExtended 10 year limited warranty


Part Numbers


Q – Can CARAPACE be buried?
A – Yes. The CARAPACE system is certified for direct burial and wet locations making the heating cable and proprietary end-seal termination completely safe to burry.

Q – Do I need to purchase a CARAPACE Power Connection and End Seal Termination Kit with cut-to-length CARAPACE?
A – Yes. The CARAPACE system requires a single power connection and end seal termination kit to complete an entire system length. Only Heat-Line CARAPACE Power Connection and End Seal Termination kits are approved for installation with the CARAPACE system. Using any other power connection and end seal kit will result in the cCSAus certification to be void, and any warranties on behalf of Heat-Line will be declined.

Q – Does CARAPACE come with a thermostat?
A – No. A thermostat is not included with the CARAPACE system as they are not required for proper and safe operation; however, a thermostat can be purchased as an additional accessory. Depending on system applications, or where automatic operation is preferred, a thermostat can be used to switch the system on and off to help conserve power or to duty cycle the system. When combined with insulation thermostats can substantially increase energy efficiency.

Q – Can I (the homeowner) install cut-to-length CARAPACE?
A – No. The CARAPACE cut-to-length product is a professional use only product. As the CARAPACE cut-to-length product is not factory terminated, a licensed electrician must perform the power and end seal terminations. CARAPACE is available as a job-ready, factory terminated system. See CARAPACE job-ready.

Q – Does the unit shut off when not required?
A – No. CARAPACE self-regulating heating cable systems increase heat output with cold but more importantly, decrease heat output with warmth. As a result, Heat-Line brand products are very energy efficient to operate, but do not completely shut off as they can only idle their output to a minimum amount. To completely shut off the system it must be unplugged or installed with a thermostat. Heat-Line brand systems should be unplugged or shut off when not required (summer months) and tested each year before use.

Q – Does a 240-volt system use less power than a 120-volt system?
A – A common misconception is that a 240V electrical appliance consumes less energy than a 120V electrical appliance. Power consumption is measured in watts, not voltage. Whether you are consuming 500W at 120V or 500W at 240V you are still consuming 500W of energy.

Q – How much power does a CARAPACE system consume?
A – All Heat-Line brand systems including CARAPACE employ Heat-Line’s advanced self-regulating heating cable technology which operates to deliver energy and heat output to areas of the pipe that are cold and reduces energy and heat output to areas which are warm. While the overall amount of energy consumed depends on multiple factors you can be assured that you are installing the most energy-efficient heating cable system available. If you would like to reduce your energy consumption further you can investigate the addition of a thermostat, timer, and or other control device. Also see CARAPACE Energy Study for further information.

Q- Is there a maximum length of CARAPACE heating cable systems?
A – Yes. The maximum circuit length of CARAPACE that is allowed on a 120V circuit is 240ft. (73m), or 660ft. (201m) on a 240V circuit.

Q – My CARAPACE system is too short; can I add a small section onto the end? If not, what can be done?
A – No. The CARAPACE system is an advanced self-regulating heating cable system that incorporates a fluoropolymer heating cable jacket engineered to be certified for direct burial and wet locations. As such the CARAPACE system cannot be spliced together in the field. If a greater length of CARAPACE is required you may purchase a single continuous product of the proper length, and or relocate a second power source and install an additional CARAPACE system to complete the required freeze protection.

Q- What type of insulation should I use with the CARAPACE system?
A – Heat-Line recommends to use insulation that is best suited to the environment in which it is going to be installed. A common type of insulation employed with CARAPACE heating cables is waterproof pipe foam insulation sleeves. You are also able to implement fiberglass insulation provided it is properly weatherproofed based on the environment.

Q – Where do I purchase the CARAPACE heating cable system?
A – The CARAPACE heating cable system manufactured by Heat-Line is available directly through Heat-Line and or any of our Heat-Line product distributors. For a list of Heat-Line product distributors in Canada and the United States please contact Heat-Line directly on our toll-free number at .

Q – Do I have to use insulation with the CARAPACE system?
A – Insulation is highly recommended when using the CARAPACE system, especially if the installation is above ground in ambient outdoor air. Insulation helps reduce the overall heat loss and therefore reduces the amount of energy the CARAPACE heating cable must consume.

  • Bridge Span-Freeze Protected 
  • Carapace Case Study 
  • Carapace Catalogue
  • Carapace Brochure 
  • CARAPACE as a Heated Riser Concept  
  • Cord-Set (CS) vs Ground-Fault (GFC) Power Supply Options
  • CARAPACE Factory Terminated Manual 
  • CARAPACE Power Consumption Study – 2008