What to do if the radiators do not heat up

What to do if the radiators do not heat up

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What to do if the radiators do not heat: all the instructions and boiler maintenance work to be carried out if the radiators do not heat.

Sixradiators do not heat upthere are two causes: a failure in the heating system or poor insulation of the rooms to be heated.

When the heating is inefficient, thermal insulation must be taken care of

Often iradiatorsthey give it their all" for heat the house and they have nothing wrong with them. In these cases, the problem lies in the structure of the house: drafts, non-insulated walls and non-insulated fixtures ... bad insulation is the cause of heat losses such as to make the action of the radiators.

If you live in a non-insulated house, the inefficiency is not linked to the heating system but to poor insulation.

If you notice that iradiators do not heat upon particularly windy or colder days than usual, check doors and windows. In this case, there may be drafts, that is, cracks that cause inconvenient air changes. The drafts, in fact, let out the hot air produced by the radiators and let the cold air in from the outside.

If there are drafts in the house, run for cover trying to better isolate your home. Where are the drafts? The drafts are located near electrical sockets, in the entrance of plumbing systems, from the chimney flue, near the shutter box and along the profiles of doors and windows. For every information:how to eliminate drafts from doors and windows.

Drafts are not the only means of heat loss. The building envelope, if very old or badly structured, could have a large number of thermal bridges.

Consider the idea of ​​renovating the house by assuming the addition of internal insulating panels. A thermal coat is the best solution to ensure the thermal insulation of the building. The thermal coat can be external or internal. An external thermal coat can be very expensive while the intervention on the internal masonry can be more accessible or even possible with DIY.

If the problem is not bad insulation of the building, then proceed with the following tips.

What to do if the radiators do not heat up

Established that the problem is related to the inefficiency ofradiatorsand not to bad insulation of the building, do routine checks on the boiler.

Access the boiler, if the heating plates are cold or just lukewarm it is appropriate to act. First, check the value of the set temperature for heating. Remember that the domestic heating temperature has nothing to do with the temperature set for the production of domestic hot water. Using the knob dedicated to domestic heating, set a temperature between 60 and 70 ° C.

After that, wait for about 30 - 40 minutes. You must allow the boiler all the time to produce hot water and let it circulate in the heaters. Calculate that isteel radiatorsthey tend to heat up faster while older onescast iron heatersthey take longer.

If the heaters do not heat up even after a maximum of 40, 50 minutes, then check the system water pressure.

From the boiler control panel there is a pressure indicator. If the pressure is lower than 2 bar, look for the water pressure lever (usually this check must be carried out directly in the lower part of the boiler), open it slightly until it reaches the value 2. Sometimes, the water key is of black color and is placed under the boiler. In rare cases it is a real tap placed near the ducts, always in the boiler room.

Once you have brought the pressure to 2 bar, be careful to close the lever well. If you experience excessive pressure, there is a tap under the boiler (usually red) which serves to release the water pressure. To decrease the pressure and reach the value 2, carefully open the tap.

To be able to increase (or decrease) the boiler pressure in complete safety, we always recommend consulting the boiler user manual.

At this point the problem should be solved but if unfortunately, returning to the heating plates you still notice that yourradiators do not heat up, get ready to vent the radiators.

Remove the air from the radiators, as is done

Bring an empty pitcher and go near the vent taps of each radiator. Let the water and water out as described in the guide article how to vent the radiators and deepen it Bleeding radiators.

The operation of boiler bleeding aims to eliminate the air bubbles present in the radiator circuit. The air bubbles, in fact, do not allow the passage and optimal distribution of heat.

What to do if the radiators do not heat the house

If the radiator plates doheat upbut the heat produced is not enough, you probably live in a house rich in heat loss. As specified in the introduction, insulation is the winning weapon for a house that consumes little and guarantees maximum home comfort.

In some circumstances the radiators are unable to heat the house, this occurs when:

  • the house is rich in heat loss
  • the radiator is installed close to a damp wall that overlooks the outside of the house
  • the radiator is installed near a window

In these circumstances, to increase the efficiency of the radiators, a reflective panel can be installed. This is a small do-it-yourself intervention that can be right for you and improve the heating of your radiators.

For this do-it-yourself, all you have to do is install heat-reflecting panels behind the radiators. This trick will help you increase the amount of heat distributed in the room.

The radiators radiate heat both front and rear. The heat spread behind is almost wasted, especially when it comes to perimeter walls, near windows or worse, damp walls.

Among the various reflective panels, I point out thoseRadflex because they are installed by gluing, they can be easily removed and they do their job well.

These heat reflective panels are easily found on the market, in plumbing and plumbing shops or do it yourself. On Amazon, they can be bought at a price of 26.51 euros with free shipping costs. From personal experience I point out that these "seasonal" products (which are only served in winter) have a price that can fluctuate a lot during the year! The cost specified is for the pack of three.

For every information:Radflex, heat reflective panels.

We have reported these reflective panels to you because for do-it-yourself installation it is not necessary to disassemble the radiators, however feel free to choose the model you prefer, taking into account your needs.

Other checks that you can do with DIY and without requiring the intervention of a technician, are available in the articleDo-it-yourself boiler maintenance.

You may also be interested in our related article: How to eliminate the air from radiators

Video: Fixing A Cold Radiator - HomeServe troubleshooting Advice (June 2022).


  1. Anwealda

    you were wrong, could it be?

  2. Radburt

    I confirm. This was and with me. We will discuss this question.

  3. Groshura

    What a phrase ... great

  4. Farris

    cool))) good excuse)))

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