Among the most used heating equipment and installed in the houses, we find the gas boilers . In reality, the market offers an important variety of models with different systems, with different energy ratings, and, therefore, Of course, adapted to almost all budgets.
In this article we are going to try to investigate the different types of gas boilers for the home that we find in the market according to its efficiency energy.
First, we must ask ourselves…
As a piece of information, we wrote an article about wood stoves pellets – biomass that you can consult from here. As you see, in the previous image, are the most efficient!
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Innovations, research, and technologies every more and more advanced, have made it possible to obtain substantial improvements in the operation of gas boilers.
Basically we can distinguish its operation according to these types of gas boilers :
They are the ones that have the combustion chamber sealed. No consume oxygen inside the premises, and are of a type of very safe operation, precisely because air does not enter in contact with the gases that are produced with the combustion.
In sealed gas boilers, the chamber where the combustion is completely hermetic. They are bi-tubular, for a duct they absorb the outside air, and through the other they extract the toxic gases and remove them through the exhaust pipe. ventilation.
In these appliances, the combustion chamber is open. Very unlike sealed boilers. In these teams, the air used for combustion is in the same place of the boiler. That makes it less efficient from the point from an energy point of view, and that it is more polluting.
Atmospheric boilers feature drawbacks, due to the fact that its combustion chamber does not It is duly isolated from the space in which it is located. install. With the system used in gas boilers atmospheric conditions, combustion gases remain in the air of the houses.
These devices are also watertight. The difference fundamental is in its design. His system is similar to condensing boilers, and offers a NOX emission index (nitrogen oxide or nitric oxide) lower. From there his name.
This type of low NOX gas boilers incorporates a design especially in the combustion system. By reducing gas contaminants, complies with the regulations of ecology and care of the environment.
It uses, like airtight installations, outside air. The burner is cooled by the water circuit, and thus This way the temperature of the fumes is reduced and with it the pollution.
This type of heating installation is considered a revolution in performance. They are also waterproof, but with the added advantage of reusing the energy generated by the water vapor in the combustion of gas.
European regulations require since 2015 (Regulation ErP), that gas condensing boilers are the only domestic boilers with permitted installation.
Your comparative performance may be greater than 100%. Saving of energy and costs, and better production of hot water and/or heating systems.
This is obtained thanks to the fact that the sealed chamber cools the gases until about 70 o Then the latent heat that is close to 200 o C is take advantage of it to generate more energy.
The cooled gas being carbon dioxide, what comes out mostly to the outside it is water vapor, of low or null level pollutant.
As a complement, you can consult our article on oil-fired condensing boilers for heating.
We have seen according to its operation and performance, but boilers are also classified according to their installation (Way to place them). is to answer the question of… What is a wall-mounted gas boiler?
Due to the way of installation, there are two types:
Currently most of the boilers installed for the provision of hot water and heating in homes, are of the sealed type. Its emission of NOX (nitric oxide) is very low, although polluting.
And, condensing boilers are gaining ground in the market, thanks to its energy efficiency, its performance and the low polluting power. And, although its price is higher With respect to the others, the investment is quickly amortized with gas fuel savings.
Yes we do have a house with a natural gas connection for heating, of course a very convenient and comfortable option for the heating system is to install a gas boiler.
Today, we can not only use it to heat the water that runs through the radiator circuit to provide heat to the home, we can also have water sanitary hot… What should you take into account when choose a gas boiler?
But first, before buying a gas boiler we must to review the following points…
More or less, we are already used to seeing labels energetic. In the case of these teams, they are governed by:
Why do we have two energy labels?… Each heating appliance carries an energy label with detailed information. And, on the other hand, the systems of heating that are composed of different technologies, they also carry the energy label of the system.
With the labels we can answer…
If the installation is only for heating we will not have no problem, but if we want to have hot water, the The market offers us different options, which are:
Please note that we need to know how much hot water we will use at home. You should think about the number of bathrooms that you have, the number of users of the dwelling and their frequency of daily use.
Although they will advise us on this aspect where we buy the caldera, at least, we should have an idea.
We have to look at the power of the team that we are going to install at home, since it is not the same to heat a home small of 50 meters, what a large home.
How to calculate the heat output for a house or room? The estimate is, for each square meter, you will need, on average, approximately 150 W of power (Always ask the specialist of the store, it is a value approximate, since the value of W also varies according to climatic conditions and insulation of the dwelling, for example).
If we situate ourselves in a real case with the data previously indicated, if we have a 120 m2 floor. They are 120 x 150 = 18,000 W, so the boiler you need must have a minimum power of 18 kw.
Remember, we can save more electricity if we install a thermostat, although the most modern equipment already has them incorporated. To know more from our article on thermostats in home heating.
Although we have already discussed energy labeling and its importance, it must be recognized that the purchase market – sale has overturned with the boilers of condensation due to its high performance.
When we go to buy a boiler we will see that the market offers us practically two types: Low NOx (Low Temperature) and Condensation. So we have made a comparison to see the differences and advantages:
| Low Nox Boilers – Low Temperature | Condensing boilers |
| Performance above 90% | 109% yield. |
| Lower performance and efficiency | Greater performance and efficiency |
| Water return temperatures 70 – 90ºC | Water return temperatures 40 – 55º C |
| Smoke temperature 90 – 120º C | Smoke temperature 40-60º C |
| You don't need a drain to channel the water | Needs a drain to channel the water condensed |
| Hands face installation | More expensive installation |
| Less complex installation – Less expensive repairs | More complex installation – More expensive repairs |
| Lowest price on the market | Highest price on the market |
In the following diagram we see a comparison of models with boiler prices :
| Boiler type | Price only for heating | Mixed price (Heating + ACS) |
| Low temperature boiler | 1,200 Euros | 1,500 Euros |
| Condensing boiler | 2,100 Euros | 2,500 Euros |
The price of a natural gas boiler is linked to its quality and efficiency. Normally, the teams of condensation are the most expensive on the market intended for to homes and also more efficient (Remember that there are also to install it, with installation prices that range between €400 – €600)
Based on the previous considerations, the boilers of condensing are more efficient than low NOx. Thus, it is advisable for the consumer to install condensation.
But… Which condensing boiler is better? Broadly speaking, it is the one that stands out among the technical criteria of:
As we see in the previous video, technically they have advanced a lot, but to choose our installation, remember that the professionals are there to advise us and always ask in several shops, prices vary and so do the offers.
In the same way, we have other heating systems efficient. You can see the thermal emitters for homes, they are very comfortable to install.
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