How to choose a sensor for a warm floor?

The temperature sensor is necessary for the normal functioning of the warm floor. To ensure the smooth operation of this system, it is important to choose the right device..


The basis for arranging a warm floor is the heating elements of the structure and the automation system, consisting of a temperature sensor and a regulator. The sensor is designed to measure the temperature of the object and transmit data to the control unit.

The sensor for the underfloor heating thermostat should be selected based on the features of the automation unit.

A prerequisite for choosing a temperature sensor is to follow the manufacturer’s recommendations.

Sensors with ambient temperature measurement are more often recommended for use.. They are easier to install and then replace, in contrast to sensors that measure the temperature in the underfloor heating structure..

More sophisticated floor heating control systems include several sensors. An example of such a thermostat is one that measures the temperature at several points. These measuring points are usually the body of the floor heater, the ambient air in the room and the temperature outside the room. The principle of operation of such an automation unit is based on a comparison of measured temperatures, as a result of which the specified floor mode is maintained..

Systems that have more advanced methods of underfloor heating include electric heaters with a liquid heat carrier. Such systems are recognized as ideal for arranging underfloor heating..

Electric heating systems with a liquid heat carrier have an even distribution of heat, smooth temperature changes, are flexibly configured and regulated. A thermostat with an electric heater and a liquid heat carrier must include a thermostat. Complete with a thermostat, the thermostat allows you to more accurately regulate the floor temperature.

How to choose?

When choosing temperature controller sensors, the recommendations of the manufacturers of temperature controllers should be followed. In addition, when choosing sensors, you should pay attention to its purpose. So, if it is designed to measure the floor temperature, it cannot be connected instead of a temperature sensor for measuring the air temperature in the room, and vice versa..

You also need to take into account the features of the sensor. For example, the appliance intended for indoor installation should not be installed in an open space.

When choosing, one must not forget that external factors can influence the measurement error..

Sensors whose measurement error will be affected by drafts, infrared radiation, must be protected against such influences.. Sensors without protection against these influences must be protected artificially or installed inside structures.

The sensor of the underfloor heating thermostat is a thermistor with connected copper conductors. The manufacturer usually supplies sensors with short wires..

The conductors from the temperature sensor to the thermostat can be lengthened and shortened. Extension of the conductors from the temperature sensor to the regulator is allowed up to 50 m.When extending the wire, remember that the longer it is, the greater the error in temperature measurement.

During the installation of the temperature sensor, it must be placed in an insulated corrugation, which is usually completed as part of the product. In addition to protection, the corrugation is also necessary for subsequent removal in the event of a sensor failure..

Its use is mandatory, and if it is not included in the kit, it must be purchased separately, following the manufacturer’s recommendations.

Having chosen a warm floor with water heating, a thermal head with a remote sensor is used. It is designed to control heating elements and maintains the temperature of the coolant within the specified limits in automatic mode. It is chosen according to the recommendations of the heating element manufacturer..

In addition to thermal heads with remote sensors, immersion sensors are used in the systems. They allow you to control the temperature of the coolant.

Installation and use

It is important to familiarize yourself with the instructions of the manufacturer of the heating system and the principle of their operation before starting the installation of the thermostat and floor heating thermostat sensors. An important condition for the successful operation of the system is the correct placement of the temperature sensor. Putting it and the wires leading to it must always be in a strobe using a corrugation.

It is recommended to install a junction box as close as possible to the output of the sensor wires.. This will allow replacement of the sensor at the lowest cost..

It is recommended to place temperature sensors directly in the body of the structure at an equal distance from adjacent heating elements. Laying the corrugated pipe follows with smooth turns and transitions. This will help in the event that the sensor is broken. Replacing a damaged device, following these recommendations, will be greatly simplified..

As a guideline, take the advice of using a trimmer cord. By attaching the sensor and lead wires to such a line, it is quite easy to insert the sensor into the corrugated pipe. Removing it with wires will be just as easy in the event of a breakdown..

Consider the typical mistakes when installing underfloor heating sensors. The most difficult thing is when you forgot to install the sensor, and the floor screed is already finished. In this case, if you are confident in knowing the exact location of the heating elements, you can make a groove on the floor and install the sensor. The second way out of this position is to install an external device for measuring the temperature in the room..

It should be remembered that there are sensors with polarity. Such sensors should be connected strictly according to the scheme specified in the instructions..

For remote sensors, when installing a warm floor with water heating, the main condition is the location of the temperature sensor at a distance from the heating elements and pipelines with a coolant. These sensors, like all others, should be protected from drafts, direct sunlight and infrared radiation..

Do not forget to follow the manufacturer’s recommendations. This will not only ensure the correct operation of the temperature sensor, but also protect against loss of warranty..

The underfloor heating control system includes a temperature sensor and a thermostat. If the manufacturer’s recommendation on the choice of elements of the heating system is followed, then the setting is reduced to setting the set temperature.

A more complex setting for a control system, which includes a programmable thermostat. In the latter case, the settings may include the turn-on time, setting the temperature of individual heating zones and other parameters..

The check consists in monitoring and maintaining the set temperature..


From all the variety of manufacturers of equipment for underfloor heating, we will analyze the advantages of products of well-known brands. Let’s note the advantages when choosing a brand for such brands:

  • Legrand;
  • Spyheat;
  • Tech;
  • Heiz.

Legrand has been working for a long time and specializes in the production of electrical devices, materials, equipment. She has established herself as a manufacturer of reliable and quality products..

Legrand programmable thermostats and thermostats have installation features. So, if you wish, you can choose equipment for installation in the seats of switches or sockets. In this case, you can put the equipment both on the wall and in the panel. Due to the quality and reliability, Legrand products have an increased cost..

The manufacturing company Spyheat specializes in the production of ready-made sets of underfloor heating and other heating systems. The advantages of the company include the fact that the company produces ready-made underfloor heating systems with all components. Since the company specializes in underfloor heating using heating cables, these products will be a budget option..

Heiz specializes in heating systems based on liquid heat transfer fluids. Thermostatic heads with remote sensors are needed to stabilize the room temperature. Devices from Heiz are distinguished by high reliability and accuracy of temperature control. The specified company provides a guarantee for its products for 5 years.. The thermal sensor is able to maintain the temperature with an accuracy of one degree. The manufacturer guarantees the sensitivity of the temperature sensor within 0.5 degrees.

Many manufacturers of underfloor heating use and recommend controllers and sensors manufactured by Tech. One of the important factors in favor of these products can be attributed to the fact that the company is engaged in the production of both equipment for space heating and for high-power boiler houses..

Tech sensors and thermostats are popular among manufacturers of heating systems, including underfloor heating kits. The reliability and quality of the Tech products is evidenced by the partnership with many manufacturers of heating systems. It will not be superfluous to add to the advantages of the product the absence of feedback on the malfunctions of its devices..

Which is better?

You can answer this question after a deep analysis of all the conditions for using the heating system..

The decisive parameters for choosing a system or an equipment manufacturer is the structure of the room. At the same time, it is also necessary to take into account in which structural design of the building the room for the installation of a warm floor will be located.

In order to determine the type of underfloor heating, should be based on the price of electricity and heat carrier. The price is calculated from the supplier’s rates for central heating or is determined by the price of the fuel used to heat the given premises.

For the subsequent selection of the manufacturer of equipment that will be used in the arrangement of a warm floor, one should focus on the price-quality ratio. In this case, the customer will independently choose the set of functions that he needs..


Everyone who uses underfloor heating has a positive opinion of its use. In most forums, issues related to underfloor heating boil down to the quality of installation. Malfunctions that are detected during operation occur due to installation errors.

To a greater extent, consumers are satisfied, whose floor heating has a programmable thermostat. notice, that operation of a warm floor in combination with a temperature sensor and an automatic temperature controller has a great advantage. Using sensors, a constant uniform floor temperature is maintained.

In addition to the convenience in temperature regulation, temperature sensors in combination with a thermostat can significantly save on energy resources. Optimum savings can be achieved with programmable thermostats.

The most economical are programmable thermostats. Moreover, the more parameters by which the regulator is programmed, the more savings it can provide. The set of parameters may include ambient temperature, days of the week, hours per day, etc..

You will learn more about how to choose a sensor for a warm floor in the following video.

About the author