Controller and Thermostat


Thermostat: basic boiler thermostat

Every boiler has a thermostat:

  • This is a basic thermostat, present on the boiler itself.
  • It measures the temperature of the water circulating within the boiler and keeps it constant.
  • It measures the internal temperature of the system, it is indifferent to the room temperature, but by varying it manually, you can regulate the heating accordingly.

thermostat and controller

Room thermostat: essential :

  • The room thermostat is normally set to a comfortable temperature setpoint: 18°C, for example.
  • Connected directly to the burner of the boiler, it modulates its operation so as to maintain the room temperature constant.
  • It is normally placed in a reference room (living room, hallway) where the temperature is supposed to be uniform and can measure and correct for variations in temperature in the house.
  • Using room thermostats to control individual room temperature canquickly produce energy savings of around 10%.


Programmers modulate the heating according to the time of occupation of the home, they usually offer three plans:

  • comfort mode: where heating is operated normally: in the evening for example.
  • economy mode: where the heating is background for overnight or for short absences.
  • frost fashion: for prolonged absences, holidays: where heating is idle.

The programming can be done:

  • based on time: 8 am to 10 pm, for example.
  • depending on the time of day: day / night, morning / afternoon / evening.
  • depending on the day of the week working days / weekends.

Three distinct advantages:

  1. Energy savings: heating is active only when necessary! If during the day, there is no one at home, you can choose to pause the heating.
  2. Increased comfort: it helps to anticipate your needs. Heating the bathroom starts up 1/2 hour before you wake up.
  3. This is automatic once you have set the device, you do not have to touch anything.

The cost of installing a programmer can be quickly recovered due to the significant savings generated.

Outdoor sensor: to anticipate climatic variations

  • The sensor measures the temperature outside the house.
  • It then propagates the changes to the climate system of the boiler.
  • It keeps a constant temperature still inside the home and shortens the normal system response.
  • It proves especially useful with floor heating systems which have a less rapid heating response.

Thermostatic valves

  • They allow you to adjust the heating of each heating radiator separately. They are placed on each radiator: 1 per unit.
  • They operate on the temperature of the water flowing through the radiators. They do not operate on rapid heating: putting the thermostatic valve on a setting of 5 will not make it heat up more quickly!
  • They are mostly graded as follows:





7 ° C



12 ° C




16 ° C




20 ° C




24 ° C



> 25 ° C




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