How to connect a thermostat to a warm floor

The ther­mo­stat can be con­nect­ed to a warm floor with your own hands — it’s quite sim­ple if you fol­low the instruc­tions. We will tell you about the nuances of installing the device in our mate­r­i­al.
How to connect a thermostat to a warm floor
How to con­nect a ther­mo­stat to a warm floor. Pho­to: shutterstock.com

If you want your under­floor heat­ing to work at its best, then installing a ther­mo­stat is a nec­es­sary step. Instal­la­tion can be entrust­ed to pro­fes­sion­als, or you can do it your­self with lit­tle skills and abil­i­ties. But even if you decide to entrust this mat­ter to a spe­cial­ist, it would be nice to know what the process looks like — just in case, as they say, trust, but ver­i­fy. Tips from “KP” and expert Kon­stan­tin Livanov, who has been engaged in repair work for 30 years, will help you fig­ure out how to con­nect the ther­mo­stat to a warm floor in a qual­i­ty man­ner.

How to connect a thermostat to a warm floor

What is a thermostat

A device such as a ther­mo­stat, or, as it is also called, a ther­mo­stat, is need­ed for the oper­a­tion of a warm floor (and not only). It allows you to con­trol the on / off of the sys­tem and fix the tem­per­a­ture regime for a cer­tain peri­od of time. And the most advanced mod­ern sys­tems are able to main­tain and change the micro­cli­mate in the house and remote­ly, through the net­work.

Step-by-step instructions for connecting a thermostat to a warm floor

Choice of mounting location

To install, you first need to deter­mine where we will put the ther­mo­stat. Most mod­ern appli­ances are designed for a stan­dard wall box with a diam­e­ter of 65 mm. They are installed in the sock­et frame or placed sep­a­rate­ly — this is not so impor­tant for instal­la­tion. It is desir­able to pow­er the ther­mo­stat from the elec­tri­cal pan­el using an auto­mat­ic pro­tec­tive shut­down sys­tem. But it is also pos­si­ble to use the con­nec­tion to the out­let (AC mains 220 V, 50 Hz).



The loca­tion of the tem­per­a­ture sen­sors is crit­i­cal to the cor­rect oper­a­tion of the ther­mo­stat. If your mod­el has a remote air tem­per­a­ture sen­sor, you need to install it at a height of at least 1.5 m from the sur­face of the heat­ed floor, and gen­er­al­ly away from heat sources (for exam­ple, win­dows or radi­a­tors). And it is bet­ter to choose mod­els with an air tem­per­a­ture sen­sor built into the device itself — there is less trou­ble with them, you can imme­di­ate­ly install the ther­mo­stat in the right place.

How to choose a ther­mo­stat for under­floor heat­ing

Choos­ing a ther­mo­stat for under­floor heat­ing can be con­fus­ing

Preparatory work

Of course, before installing the ther­mo­stat, it will not be super­flu­ous to study the instruc­tions that any self-respect­ing man­u­fac­tur­er puts in the box with the device. This is also why experts rec­om­mend choos­ing cer­ti­fied devices from trust­ed com­pa­nies, and not chas­ing cheap ana­logues from Chi­na.

Before instal­la­tion, pre­pare the fol­low­ing things:

  1. Cor­ru­gat­ed mount­ing tube. Usu­al­ly it comes with a warm floor, but any­thing can hap­pen. Uni­ver­sal diam­e­ter — 16 mm. But to deter­mine the length, you need to mea­sure the dis­tance between the instal­la­tion site of the device and the tem­per­a­ture sen­sor.
  2. Reg­u­lar screw­driv­er.
  3. indi­ca­tor screw­driv­er. It is use­ful in order to find out what volt­age is in the mains.
  4. Fas­ten­ers.
  5. Lev­el.
  6. Mount­ing box and frame for light switch­es

Final­ly, we make a hole for installing the device and grooves in the wall and floor, which are need­ed for lay­ing pow­er cables and remote tem­per­a­ture sen­sors.

Electrical connection diagram

So, we are all ready to con­nect. We bring wires into the junc­tion box: a blue wire goes to “zero”, the phase is con­nect­ed to a black wire, ground­ing is con­nect­ed to a wire in yel­low-green insu­la­tion. Do not for­get to mea­sure the volt­age lev­el cre­at­ed between “zero” and phase — it should be 220 V.

Next, we’re going to cut the wires. This must be done in such a way that they pro­trude from the box by about 5 cm. Of course, the wires must be stripped.

After strip­ping, we con­nect the pow­er wire to the installed ther­mo­stat. The scheme is always in the instruc­tions and is dupli­cat­ed on the instru­ment case. We throw the phase wire at the desired con­tact, it is marked with the let­ter L. “Zero” is denot­ed by the let­ter N.

Now we need to con­nect the tem­per­a­ture sen­sor to the ter­mi­nals on the device. We recall that it must be laid in a cor­ru­gat­ed pipe.

To test the ther­mo­stat, you need to set the max­i­mum tem­per­a­ture on it. The click of the relay will let you know that the heat­ing cir­cuit is closed. That’s it, if the under­floor heat­ing and the ther­mo­stat are con­nect­ed cor­rect­ly, then you get a work­ing sys­tem.



Popular questions and answers

I already have a warm floor, I want to install a thermostat, but the amount of work scares me. Can the appliance be installed with minimal effort?

It is pos­si­ble, but in any case, the con­nec­tion to the ther­mo­stat for under­floor heat­ing and the sen­sor will have to be mount­ed. Look towards embed­ded mod­els. Such ther­mostats can be neat­ly installed where it is con­ve­nient for you.

How much can you save on your heating bills by installing a thermostat?

With a high-qual­i­ty ther­mo­stat, you can save up to 70% on heat­ing bills for the fam­i­ly bud­get. But it must be borne in mind that in order to achieve such indi­ca­tors, it is nec­es­sary to use mod­ern tem­per­a­ture con­trollers that can oper­ate in a pro­gram­ma­ble mode and have remote con­trol.

I am going to install a warm floor and a thermostat at the same time, I will pour the floors with concrete immediately after. How long do you have to wait after the screed to use the heating?

The sys­tem on a per­ma­nent basis after pour­ing, screed­ing and lay­ing tiles (lam­i­nate) should only be used after the screed has com­plete­ly dried. For exact infor­ma­tion on the time required for this process, it is bet­ter to check on the pack­ag­ing of the dry mix that you are using. Oth­er­wise, the heat may cause cracks in the fill.

The youngest son strives to constantly turn something on and off. I’m afraid that he can get to the thermostat if you put it. Is it possible to put it somehow imperceptibly?

There are sev­er­al solu­tions in this sit­u­a­tion. You can, for exam­ple, try to put the ther­mo­stat high­er. But in fact, the most con­ve­nient option is to lock the ther­mo­stat con­trol pan­el. The lock of the but­tons in the device turns on auto­mat­i­cal­ly, and to unlock it is required to press a cer­tain com­bi­na­tion of but­tons.

What safety precautions should be observed when connecting a thermostat?

As with any work with elec­tri­cal appli­ances, it is worth remem­ber­ing safe­ty pre­cau­tions. It can not only pre­vent the fail­ure of the ther­mo­stat and under­floor heat­ing, but also save your prop­er­ty, and maybe life.

The rules for safe­ly con­nect­ing a ther­mo­stat to a warm floor are quite sim­ple:

- De-ener­gize the entire house and apart­ment before con­nect­ing. This is the most cor­rect option, but if this is not pos­si­ble, then at least dis­con­nect the ded­i­cat­ed line to the ther­mo­stat from the net­work.
- Do not turn on the mains until the ther­mo­stat is ful­ly assem­bled.
- Of course, devices are most often installed in con­di­tions of dirty repairs, but before installing and turn­ing on, clean both the place and the device.
- Do not clean the ther­mo­stat with aggres­sive chem­i­cals.
- Nev­er allow work with exceed­ing the pow­er and cur­rent val­ues ​​that are high­er than those indi­cat­ed in the instruc­tions for the device.

Final­ly, if you are not com­plete­ly con­fi­dent in your abil­i­ties, then it is bet­ter to entrust the instal­la­tion of a ther­mo­stat for a warm floor to a spe­cial­ist.