Heating cable for water pipes inside the pipe: types, how to choose and install

In some situations, it becomes necessary to install a heating cable for a water supply system inside a pipe. In regions where winter temperatures reach very low levels, people rightly ask: "At what depth should water pipes be laid, since regular insulation in cold regions does not protect them from freezing?".

To prevent this, the main line is equipped with internal heating. This allows the pipeline to maintain the desired temperature even when the temperature drops significantly.

In this article, we'll take a detailed look at what a water pipe heating cable is, how it works, its characteristics, the different types available, which cable to choose depending on the situation, and how to install it inside or outside the pipe.

What is a heating cable and how does it work?

Heating external pipelines is very common in many regions of Russia. Heating cables for water pipes can be installed both inside and outside the pipe, and are essentially simple wires. Thanks to the presence of resistance, one of the possibilities was used metal conductor — metal passes an electric current through itself has the ability to heat up.

As the current increases or decreases, the cable's temperature rises or decreases accordingly. Thus, these physical properties make it possible to regulate the temperature limit.

Accordingly, the lower the resistance level, the hotter the device will become. It goes without saying that self-regulating electrical cables must be well-insulated, as they are located in water.

Turn on the heating cable at a temperature of + 5 degrees Inside the water supply system. As the ambient temperature decreases, the resistance in the wire increases, thus maintaining the desired water temperature in the water supply system.

This cable is available in various lengths, ranging from two to twenty meters. It allows you to heat a portion of a water pipe, or the entire main line if it's located in a freezing zone.

Heating cable inside the pipe connection

At first glance, such a cable seems like a very simple device that can be installed by yourself and effectively heat the water supply.

However, in order to correctly select and install a heating cable inside a pipe, it is necessary to carefully study all the information that will be presented below.

Let's consider the design of heating electric wires

Heating cable for internal installation is produced in the form of a tape electric heater. The heating device has the following components:

The outer insulation layer on the heating cable has the following characteristics. It is resistant not only to exposure to moisture and high temperatures, is absolutely not afraid of impact aggressive chemical environmentThe cable design may vary slightly; another version of the device is shown below.

Also, the heated cable for installation inside water pipes is made from materials whose composition is approved for use in the food industry. Therefore, it can be installed in drinking water pipes.

In addition, the heating cable is equipped with a temperature controller, making it self-regulating and capable of independently setting the temperature regime.

This allows for monitoring the temperature inside the water supply system without human intervention. If the temperature exceeds the set parameters, the system is automatically shut off. These features prevent overheating and conserve energy.

Perhaps the only drawback of these heating units is their dependence on electricity. For this reason, the installation of additional power sources in the main pipeline sections is recommended.

Types of heating cables - resistive and self-regulating

Internal or external heating of the pipeline depends on the method of heat generation and is performed by the following types of devices.
1. Resistive — consist of one or more metal wires. Single-core Due to the complexity of installation, they are used much less frequently. The difficulty lies in the fact that they require looping the circuit around the power source, which is not always possible.

Two-wire— connect to a power source at one end, and install a contact sleeve at the other to ensure the circuit is closed.

Either one conductor (the other only provides conductivity) or both can heat up. In the latter case, the power output becomes significantly higher.

2. Self-regulating — a heating cable designed for installation both inside and outside the water supply system. Its operating principle is similar to the previous type of device. A distinctive feature is the ability to independently regulate the heat supply level as the temperature changes, resulting in significant savings in electricity consumption.

For these reasons, it's ideal for installation in small sections of the pipeline. A thermostat is not required. Self-heating cable-type devices come with not only a thermostat but also various installation components and special glands—adapters for threading through the pipeline.

Self-regulating heating cable has become more widespread.

The disadvantages include the high cost of self-regulating wire.

Selecting a cable by power and manufacturer

Internal self-heating cable for heating water pipes is divided according to the type of use according to power ratings.

The power rating depends on the following parameters: the average annual temperature in the region, the pipeline installation method (external or internal), its insulation, and whether the heating will be delivered from inside the pipe or from outside. The pipe diameter is also an important factor.

The amount of heat loss depends on the volume of the pipe and the quality of the insulation layer. For example, a metal pipe 50 mm pipe insulation by 20 mm will be heated effectively by a device with a power at 20 W/m.

A high-power cable system is installed along a critical main heating line. Before installing such a system, it's important to know that the power rating of the heating cable is selected based on the diameter and length of the main line. However, the energy consumption for heating in this case will be significant.

What is the purpose of a heating cable in plumbing?

Raychem (Germany) products are the most popular among specialists. This product line offers a variety of models used not only in industrial facilities but also in domestic pipelines.

Every cable kit offered by this manufacturer is more expensive than similar options from other manufacturers. However, this is fully compensated by the quality of the product.

Professional craftsmen also include the Russian company "Yulmart" in the line of high-quality products, which quickly gained popularity among consumers.

The German-made "Underlux" pipe heating kit deserves special attention. This kit, designed for installation within the pipe network, is most often used in households.

Underlux products are easy to install, using cast fittings. The main advantage of this self-regulating device is its ability to independently adjust operating parameters depending on the ambient temperature.

This advantage ensures long-lasting and reliable operation. The kits offered by this manufacturer are highly efficient and energy-saving. They can be installed in plumbing and drainage systems, drains, and other applications.

The review of various manufacturers could go on and on. The main thing to do when choosing is to carefully consider the pros and cons of the options. Each model also comes with manufacturer's instructions, which should also be carefully reviewed before use.

Video: Insulating a water supply system from the trench to the house

Insulation of water supply pipes from the trench to the house + heating cable

You can buy a good, high-quality product from many manufacturers, but it's best to contact a reputable company. If you have difficulty determining the amount of wire to purchase, our consultants can help you calculate it.

They will also help you choose the right product at a reasonable price. Incidentally, the best place to buy electrical conduit for pipes is the Leroy Merlin construction hypermarket. It always has a wide selection of high-quality products at reasonable prices.

Cable prices

The price of a heating cable kit is influenced by a number of factors:

• length of the heating product;
• equipment;
• the cost of the gland, which is necessary to insert the heating cable into the water supply;
• model of power cord with plug;
• sockets;
• Price list for assembly services for all components.

The average price per meter of heating cable is 440 rubles. The adhesive kit for connecting the structure starts at 350 rubles. The minimum price for glands is 420 rubles. A two-meter power cord with a molded plug can be purchased for 200 rubles. Assembly of the entire kit costs at least 500 rubles.

Heating cables are sold in specialized stores, where you can find the right size. You can also order the finished product by courier delivery from companies that sell these products by phone or online.

To reduce the amount of energy consumed when using a water heating cable longer than 3 meters, it is recommended to use it with a thermostat sensor.

Installation works

Installing a heating cable into a pipe should be done by professionals. They will not only accurately determine how many meters to purchase but will also install the heating device in compliance with all safety regulations.

It is important to remember that heating cables for plastic pipelines, as well as for pipelines made of other materials, are constantly operating in water and can become a source of health hazard.

Therefore, if a professional installs a hot water supply system, they will take into account all the installation details. However, for smaller sections of the water supply system, installation can be done independently.

A properly installed heating cable for a water supply system inside a pipe will create a long-lasting, non-freezing water source that will function smoothly on cold winter days.

How to install a heating cable inside a pipe

If you decide to install the pipeline heating system yourself, you should read the instructions carefully before starting work.

Let's look at installing a heating cord, using the example of installing a heating cable inside a water pipe. A self-regulating, heating electric cable with a food-grade sheath must be installed in the water pipe.

Purchasing materials

Before heading to the store, you need to determine the size—its length should match the length of the water pipe being heated. You should also immediately purchase the necessary installation materials: a gland, a section of electrical wire with a plug, and a set of couplings. You'll also need a tee to properly insert the heating cable.

Devi products are ideal for heating wells and water pipes inside during winter. They can independently regulate the heating process depending on temperature changes.

Preparing the heating cable

Preparation involves insulating the heating cable using sleeves. The process involves performing end seals:

• the top protective layer is removed by 4.5 cm, the braided wires are cut off from the insulation sheath;

• one side of the matrix is ​​shortened;
• The heat shrink tubing is crimped using a crimper.

At this point, the work on insulating the heating cable is complete; if all steps are performed correctly, the unit will be completely sealed.

The self-regulating design fails more quickly when frequently switched on and off. Also, improper connection to the power source and poor termination can negatively impact its operation.

Connecting the power cable to the main cable

This action is required to supply the heating wire with electricity, which is necessary for the functioning of the entire device:

• the power cord is prepared - the wires are separated and the insulation is stripped;

• A pass-through kit (seal) is put on it - each part is put on strictly according to the instructions.

The process of connecting the heating element to the power element looks like this:

• the protective insulation layer is removed;
• the veins are released from the matrix;
• a heat shrink tube is placed on the heating cord;
• the supply and main wires are connected using a crimping sleeve;
• HDPE wires are insulated with a pipe;
• the braid is spliced ​​with the core of the power supply cable;
• the final isolation of the node is done.

These steps are only necessary if you're building the unit yourself. Purchasing a ready-made water supply heating kit eliminates the need for these steps.

Placing the cable inside the pipe

The cable can be inserted only after the couplings have cooled, by pushing the insulated end of the cable into the water pipe. It is inserted through the installed tee. This should be done smoothly, and sharp corners should be avoided, as this could damage the cable.

Once the entire wire is inside the water pipe, the entry point needs to be sealed, which is what a penetration seal is for. All fasteners are tightened firmly by hand and then tightened with a wrench. This compresses the rubber insulation inside, thereby sealing the connection.

When placing a heating cable inside a water pipe, make sure that the electrical wire does not pass between the shut-off valves, as this will lead to damage.

Connecting to the power supply

Once installation is complete, you can connect the heating system to the power supply. It's best to use a separate power source. Consider line safety and equip it with a 10 mA RCD.

This will protect against current leakage if the cable is damaged. The device will de-energize the line, thereby protecting the owner from electric shock in the event of a malfunction.

Connecting the heating system is simple. Simply insert the Euro plug located at the end of the power cable, which is connected to the heating wire, into a power outlet.

Since the design uses a matrix, there's no need to monitor the temperature or shut down the system. The self-regulating cable is "smart" and will automatically monitor this process. This completes the connection process.

The heating cable is activated when the temperature of the liquid inside the water supply reaches +5 °C, and the system is switched off at a temperature of +15 °C.

However, it is important not only to connect the heating device correctly, but also to operate it correctly so that it lasts a long time:

• Do not unplug from the socket unless absolutely necessary - this will reduce the life of the cable and the self-regulating matrix will fail;
• If the water supply system is laid on the surface, additional heating of the pipes from the outside should be considered, in the form of a heat-insulating casing; this will reduce heat loss in the winter.

The answer is a question.