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Set heater correctly
Set heater correctly
Video: Set heater correctly
Video: How To Use Your AC/Climate Control/Heater Correctly 2023, February

If you set your heating optimally, you not only save energy costs, but also relieve the environment. With our tips you have the right twist and don't waste money.

In order to heat the home as quickly as possible, many people make the mistake of opening the radiator thermostatic valves fully. But the valve is not a tap and if the number is higher, water is no longer pumped through the pipe - just because it is set to five means that the room does not heat up faster. Often you then forget to turn it back and it is heated more than necessary, or if the heating is set correctly. You should acquire some basic knowledge so that you can set your heating correctly.

Set heater: The heater thermostat

We use the numbers on the thermostat to control the desired room temperature. The various levels only influence the room temperature up to which a radiator heats. As the? A temperature sensor is built into the thermostatic valve, which measures the room temperature, compares it with the desired level and opens or closes the valve accordingly. The radiator thermostat therefore keeps the room temperature constant.

Example: The room is 18 degrees Celsius, the heating is set to level three - which corresponds to about 20 degrees Celsius. The heating valve opens and warm water flows into the radiator until the set target temperature is reached. The valve closes automatically. In principle, the thermostat constantly compares the actual temperature with the target temperature and reacts accordingly. Set the heater to level 5, so tell her you want it to be extremely warm all the time.

Set heating: This is what the numbers on the thermostatic valve mean

* = Frost protection about 7 ° C
step 1 about 12 ° C
Level 2 about 16 ° C
level 3 about 20 ° C
Level 4 about 24 ° C
Level 5 about 28 ° C

The lines between the steps correspond approximately to one degree. On some thermostatic heads there is even a legend with the levels and the corresponding target temperature. Only an intact thermostat can work properly - you should replace defective and older devices. The thermostat is constantly in motion and is opened and closed several thousand times a year - a certain amount of wear and tear is therefore normal. Check the thermostatic valves several times a year and replace them as required. If such a valve has served you well for 15 years, you should replace it.

Theromstat Heizung
Theromstat Heizung

Take the test! Do you know how to set the heating or what the numbers on the heating controller mean?

Photo: fotolia / Ingo Bartussek

Set heating: The ideal room temperature

Normally, the temperature is 23 degrees Celsius when showering, it is good to live and work at 20 degrees, 16 to 18 degrees are sufficient for sleeping and cooking. We feel the same value differently - depending on whether we are fit or, for example, flipped, wearing a summer dress or sweater. For older people, the heating often has to be set higher. It's best to find out for yourself which temperatures are the most suitable for you.

The heating is not set correctly: the consequences

Anyone who has not set their heating correctly for a longer period of time and turns it too high basically only causes more heat to escape through the wall of the house. The higher the temperature difference between inside and outside, the more energy is inevitably lost. This means that the radiators "boom", energy consumption and costs increase - a vicious cycle! So it is better to set the heating correctly right away.

The central control on the boiler

If you want to save energy in the long term, it is important that you not only set and operate the radiators correctly, but also the central control of the boiler. First of all, you should compare and change the set times and programs with the actual requirements. The heating was often only set once, during installation.

Heating smart

Even in an average three-room apartment or a house with four or five rooms (six to 15 radiators), constant adjustment of the heating or the thermostats can be quite annoying. In addition, we do not always come home at the same time and it may happen that it is not warm. Modern technology can make everyday life easier for us here. Programmable thermostats increase comfort, can be controlled on the go and even save costs in the medium to long term. You can easily replace the thermostats yourself on any ordinary radiator. If you also think about such a little helper, you are spoiled for choice: A set of five smart thermostatic valves including a control unit are already available for around 200 euros.

Smartes Thermostat
Smartes Thermostat

Smart henchman: With programmable thermostats, the temperature can be regulated more easily, adapted to specific times of the day and living situations

Photo: innogy

The 5 most common heating defects and their causes

As long as you don't freeze, you don't think about heating. Only when it stops working is everything about it - usually in winter. Some problems can be solved on your own, others can only be solved by a specialist. Here are the five most common heating defects and their causes.

1. The heating stays cold

Although all thermostatic valves are turned on, the heating remains cold or does not start at all. Either the heating is not set correctly, the pressure in the water line is too low, the circulation pump is not running properly or you simply run out of fuel.

So first check all settings, either via the control panel of the heater or - in newer systems - via the app on the tablet. If everything is OK here, take a close look at the heating manometer: If the pressure is below a bar, this may be the reason for the heating not working. If the pressure is in the normal range, inspect the circulation pump. The hot water is only distributed in the system when it is switched on and working properly. It also happens that the fuel simply runs out. Simply check the gas or oil tank here and order new fuel if necessary.

2. The radiators do not become completely warm

The radiators only achieve full heating output when they also become completely warm. If your radiators only get warm at the bottom or only at the top, you should do something about it. A common reason for this condition is too much air in the heating system - especially in autumn, i.e. at the beginning of the heating season. In this case, simply turn on all the radiators for a short time and bleed the heating. The air should then have disappeared from the system and the radiators should function normally again. If this is not the case, the heating is not set correctly. This is where the specialist helps: with hydraulic balancing, it ensures the right pressure conditions in the heating system.

If there is too little water in the heating circuit, this is often due to a defective expansion vessel. You can test it by tapping the round metal bowl that is usually near the heating system. If it sounds hollow on one side, everything is fine. If, on the other hand, it appears to be completely filled with water, the compensation membrane is often torn and the pressure compensation in the heating system no longer works. Many homeowners are now simply refilling water. However, this means that there is too much water in the heating system and escapes through the pressure relief valve when heated. In this case, the expansion tank must be replaced by a specialist.


A manometer measures the exact water pressure. From its display you can quickly see whether there is too much air in the radiators.

Photo: iStock / alder7

3. The heating does not go out

If the heating continues to heat up the apartment and does not regulate itself automatically when the required temperature is reached, either the pin in the thermostatic valve is jammed, the valve is defective or the radiator temperature sensor is covered. It is best to check the sensor first. If this is covered, remove the interference factor and wait for the problem to be solved. If this is not the case, turn off the thermostat and gently hit the spindle pin. During the summer, i.e. outside of the heating season, the thermostatic valves are often closed and the pins are simply stuck. If that doesn't help either, turn off the radiator and wait. If it does not cool down, the thermostat or closing mechanism in the valve are defective.

4. The heater drips

If the heating system drips, you should definitely consult a specialist as soon as possible, because water damage spreads as long as it goes unnoticed and is very difficult for the layperson to find. The reasons for the dripping heating can be porous seals and leaks on pipes or radiators.

5. Noises in the heating

Does the heater chuckle and whistle again and again? The noises are annoying but harmless. Here, too, the problem should be resolved after venting.

Knocking or cracking in the heater, on the other hand, is not so easy to fix. The pipes are often too narrow, so that the hot water pipe expands and touches the cold water pipe. Usually, only a new installation of the pipes helps here. If the pipes are freely accessible, sometimes a piece of cardboard is enough to separate the pipes at critical points.

A rattling in the heating system is an indication of reversed supply and return pipes during installation. The radiators get warm, but the water flows through the valves in the wrong direction. The specialist can help you here by installing other valves. Test: Turn off the heater and wait until it has completely cooled down. Now turn the heater back on. If the lower heating pipe becomes warm first, then the valves have been swapped.

A hum in the heater is a clear sign of an error, which unfortunately can have many triggers. From loose pipes to incorrect heating settings. You should also consult an expert here. The problem may be of a larger nature and should be cleared as soon as possible.

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