The gas heater does not heat the water

After a long day at work, many people enjoy the pleasure of taking a nice hot shower when they get home, as it can be very relaxing. But when the heater is not working properly, there are several things that can go wrong and here we will go through them one by one.


If you have come home to find that there is no hot water coming out of the taps, it is most likely that your heater has broken down or needs some type of maintenance. This equipment and its installations have elements to raise the temperature of the water to the desired level, but they require constant attention to avoid malfunctions.

Having a specialist in the field will help to resolve the situation quickly so that you can have hot water in your pipes again for personal hygiene, although it is also useful in the kitchen to clean certain appliances more easily, such as a crepe machine, a glass blender or a coffee maker.


Why doesn’t the water heater work?

A gas water heater works when the circuit is completed by turning on the tap. This action is responsible for igniting the flame in the boiler and allows the warm water to enter the heater, to then circulate through the coil towards the pipes, reaching the outlet at the determined temperature.

Although it may seem simple, the installation of the gas boiler and its pipes contain sensitive elements that can be affected by various factors; among them, the constant use. When a piece of equipment works with water, it is exposed to friction from particles that cause wear and corrosion inside, which, over time and its accumulation, can be a serious problem.

Another influencing factor is the fact that the heater uses fuel. The gas has an effect capable of wearing down the internal coating of the pipes and affecting the components of the system. In addition, the constant generation of heat causes changes in air pressure, which must be supported by the pipes.

Finally, it is also necessary to consider the intensity of use that is given to the gas heater. As expected, in cold seasons much more hot water is usually needed than in summer; and this generates an extra effort on the part of the system that, over time, will require its respective maintenance.

Common reasons for malfunctions in domestic gas heaters

If the boiler turns on, but does not heat the water, the reasons why it is failing can be varied and then you can check them one by one to rule them out and find a diagnosis that allows you to solve the problem:

1. Circuits on and off

When the problem is in the on and off circuits of the heater, you may notice that the hot water does not come out when you turn on the tap, but instead stays cold and this could be due to a faulty heat membrane that is not able to send the message correctly to the heater.

Therefore, if you notice that the water heater does not turn on when you open the tap or that the heater does not turn on the burners, it is most likely that some fundamental part has been damaged, such as the coil or the aforementioned heating membrane.

2. Blockage in pipes

Another reason that could explain why the shower water is lukewarm is that the pipes have become blocked or clogged.

The water of the cities transports various minerals, such as lime. This mineral is capable of accumulating on surfaces and causing blockages that prevent the free flow of water, directly affecting the performance of the gas boiler and the pipes in general.

Like most problems, blockage also needs immediate attention, as low or no pressure could increase the level of heat in the pipes.

3. Filtration in the installation

The coil is a spiral pipe that is located very close to the heater and is responsible for transporting the water. When leaks occur in the boiler installation, the coil is usually one of the compromised elements.

This may be due to broken sections of the pipe or connections that have loosened, allowing water to escape, and should be repaired soon, as excessive moisture could damage other parts or even cause leaks through walls and floors.

4. Low water pressure

To know what water pressure a gas heater needs, you must have a pressure gauge, which is a tool specially designed to measure atmospheric pressure and real pressure.

By connecting the pressure gauge to the unit outlets, the reading of the internal pressure in the equipment is obtained. If these values ​​are not in their proper position, the system will not work as it should and could even waste fuel.

5. Unknown noises

Unknown noises are a clear sign that something is not working properly in the gas boiler installation. They are usually due to a piece that has broken or slipped out of place.

This type of inconvenience must be attended to in the shortest possible time, since the movement of whatever is causing the noise can impact sensitive elements and cause greater damage.


If, for example, you realize that your Bosch, Ariston or Junker heater installation does not spark, you can take a look yourself if you feel qualified to do the diagnostics, but in the case of complex installations, it is best to contact a specialized technician who carries out the repair of gas heaters.

Similarly, checking the heaters yourself and the condition of all their sensitive parts on a regular basis will help make maintenance easier and prevent worse issues.

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