Household gas boilers are most often used in private homes and apartments, although the latter are usually centralized heating. perhaps not the most efficient. Boiler installation also makes sense in cottages, cottages, bathhouses and other similar facilities, which need heating.
For apartments is suitable boiler with the following parameters:
- 2 circuits,
- closed combustion chamber,
- coaxial chimney,
- convection heating,
- electronic control,
- wall installation,
- output from 10 to 30 kW.
For a private home, you can choose a more bulky, but practical and not as expensive option:
- 1 circuit indirect water heater,
- open combustion chamber,
- vertical flue,
- condensing heating,
- electronic control,
- floor installation,
- power from 20 to 50 kW.
The power of the heating equipment is the first thing you need to determine before buying. It is calculated through the heating area, taking into account the climate zone.
At first, with a standard ceiling height of up to 3 meters you can do simple calculations: multiply the area of the housing by the factor for your region, and divide the total by 10. As a result, you will get an approximate output of the boiler in kW.
On the way of installation of the boiler depends not only the organization of space, but also the safety of gas equipment. Wall mounting will save space, but the compactness of the model entails a number of technical constraints. Burner, exchanger, pump and control electronics will be too close to each other, which will create a tense temperature mode of operation and complicate maintenance. Compact wall-mounted models have capacity limitations. they are more suitable for apartments than for private homes.
Floor standing boilers are usually installed in separate rooms, so their dimensions, as well as heat output, are not limited by anything but common sense.
Features of the selection and installation of the most economical gas heating boiler
Gas is the most popular energy resource, which is used for heating. A unit that converts the energy created by the combustion of gas into heat is called a gas-fired heating boiler. With the annual rise in gas there is the question of saving money and the natural resource itself. To keep costs down, you need an economical boiler that uses gas productively to heat the fluid in your home heating system.
Top 15: The best two-circuit gas boilers in 2022
The best floor standing two-circuit gas boilers
|2.||Pechkin KSGV-31,5, 31.5 kW||Two-circuit floor gas boiler with excellent value for money||3.||Baxi SLIM 2.300 Fi, 29.7 kW||The best two-circuit floor standing gas boiler in the premium segment||4.||Lemax Premium 16NB, 16 kW||Floor standing gas boiler with mechanical control||5.||Siberia 29K, 29 kW||Not bad two-circuit gas boiler floor type||2.||Lemax PRIME-V20, 20 kW||Wall mounted two-circuit gas boiler with low life level||3.||Navien Deluxe S COAXIAL-24k||Popular two-circuit gas wall type boiler||4.||Bosch Gaz 6000 WBN 6000-18 C, 18 kW||Quality gas double-circuit boiler||5.||Buderus Logamax U072-35K, 35 kW||Good two-circuit gas boiler of wall type||2.||Kentatsu Balance Plus 24-2CS||The best budget two-circuit gas wall type boiler||3.||Protherm Leopard 24 BOV, 22.1 kW||The best two-circuit gas boiler under 10 000||4.||Ferroli Tantaqua N F 30, 31 kW||Best two-circuit gas boiler under 100 in 2022||5.||Arideya CS: GO-GV-12,5, 12.5 kW||A good budget two-circuit gas boiler floor type||
Top of the best two-circuit gas boilers
What floor gas boiler is better to choose?
Choice in favor of gas equipment due to the economy of use, as natural gas has the lowest price compared to alternative fuels. However, in order to maximize the benefits, it is important to choose the equipment correctly, as well as to install and maintain it in accordance with all established requirements.
When choosing floor gas boilers, you need to pay attention to the following criteria:
The choice of floor standing gas boilers for country and private houses is very large. To narrow your search, it is recommended to carefully examine the models presented in the rating of the best floor standing gas boilers in 2022.
Rating of the best floor standing gas boilers
Best two-circuit wall mounted gas boilers
Best cheap wall mounted gas boilers (under 30 000 )
When organizing a heating system in the house, any homeowner wants to save. For this choose the type of fuel and buy a reliable source of heat. Since the list of products is huge, it is necessary to study their characteristics. The review presents the best economical boilers 2020 according to buyers.
Choosing a gas heating boiler
To begin with, there is a huge variety of heating boilers on the modern market, which work on natural gas. They differ from each other not only in technical and operational characteristics, but also in purely design features. Therefore, we will compare boilers on different items, and then provide a rating of gas boilers.
Boiler floor or wall-mounted
From the names of the two gas units, it is clear that one is installed on the floor, the second is mounted on the wall. But this is not the only difference between them.
First of all, wall-mounted models are low-powered compared to floor-mounted ones. That is why they are installed in small private homes. Although there is an option when one floor standing unit is replaced by two or three wall mounted, connecting them to different heating circuits. This scheme of the heating system is often used in large houses with several floors. That is, the owner has the opportunity to slightly heat the part of the house where people are rarely present, which leads to significant savings in gas payments.
Wall mounted boilers have a small weight of no more than 80 kg. The reason is because they are wall mounted. As for the power, it does not exceed 35 kW, and the tank capacity does not exceed 40 liters. That is, it is a great option for a house with a total heated area of 100-120 m². But wall-mounted models have two more significant advantages:
In this respect, floor units are heavier. Their minimum weight is 100 kg. They are more powerful in terms of heat production and the size is larger. Therefore, they can only be installed in rooms that meet the requirements of specialized SNIP. That is, such rooms must comply with regulations: the height of ceilings, the height of the foundation on which the boiler is installed. A very important parameter is the air exchange rate. That is a lot of troubles with the floor appliance.
Plus, in general, these models are equipped with open combustion chambers. Therefore, they must be installed properly calculated chimney. And the air flow should be adequate.
But it is necessary to note the fact that wall hung gas boilers have a thin place. it is a heat exchanger. It is made either of steel or copper. The second option is expensive, but it will last longer than the steel one by two or three times. Why, because on a steel heat exchanger will always be formed condensate, which leads to corrosion processes. And this is a serious disadvantage.
As for the heat exchangers of the floor type, they are made of cast iron. Because the weight of the unit does not really matter. It is not necessary to hang it on the wall. And cast iron will serve you well for decades to come. So in this respect, the floor models are better.
It is clear that in terms of price the wall-mounted ones are preferable. In addition, it should be added that they are equipped with a circulating pump and an expansion tank. That is, all this is already included in the cost of heating equipment. For floor-type both elements will have to buy separately. And this is another additional cost item.
Connection of the gas boiler, both floor and wall, the process is not the easiest. In this respect they are equal. The main thing. no amateurism. These should be dealt with by professionals.
The boiler is either a single-circuit or double-circuit
What is the difference between a two-circuit gas boiler for heating a private home from a single-circuit. Let’s start with the latter. This is the classic heating option. It has one heat exchanger, which heats the water circulating through the heating system.
How to save gas using your central heating boiler.
Now about the choice. It would seem that the optimal solution is to choose a two-circuit gas boiler for heating for a large house, and for a small house a single-circuit. But it is not so easy.
The principle of dual-circuit gas boiler is as follows. two circuits can not operate simultaneously. That is, when the hot water system is turned on for consumption, the circuit is turned off for the heating system. This is done in order to increase the efficiency of water heating in the DHW system. It turns out that while you bathe in the bath or shower, the radiators in your house gradually cool.
Often another situation occurs. You’re taking a shower, and your wife has decided to do the dishes. The result. you get a contrast type shower, when you get hot and cold water flowing out of the shower head. Solve the problem by buying a more powerful dual-circuit gas boiler may not work. You need an accurate calculation of both the heating and hot water systems for hot water consumption.
There is a way out. install one or more single-circuit gas boilers for heating, and use a boiler for the DHW system. The last one is selected by volume. For example, if this parameter is 200 liters, it will be enough for a family of 5-6 people. The boiler itself. it is an insulated steel vessel, in which the coil is installed, which serves as a heat exchanger. It is connected to the heating system, so there will always be hot water in the house.
But compared to two-circuit gas boilers for heating and hot water, this combination will cost more. In addition, for it will have to organize a separate room.
And one more disadvantage. Practice in operating two-circuit boilers shows that often due to the increased hardness of the water DHW exchanger quickly fails. And its repair is almost 50% of the cost of the boiler.
If you are thinking sensibly, the optimal solution for the installation of double-circuit floor and wall gas boilers for heating and hot water will be a small private home.
Boiler convection or condensing
Scientific and technological advances in recent years have presented a large number of technologies and materials. It did not pass over heating units as well. That is why there are two varieties of gas boilers on the market today, based on a different method of heating. This is the traditional variant, aka convection, and condensation.
How an ordinary gas boiler works. In the furnace burns natural gas, which is heated by a heat exchanger, inside which the water flows. In this case, the burned fuel emits a certain amount of thermal energy, which is not fully used by the boiler. It simply flies out through the chimney. Hence the efficiency of such devices. not more than 90%.
Condensing models are different in design in that they have two chambers. In one the fuel burns, in the other carbon monoxide gases and the excess heat condenses on the surface of the heat exchanger. The process of condensation is accompanied by the release of thermal energy, which increases the temperature of water heating.
It must be noted that condensing units are economical. And, it would seem, the replacement of convection heaters for condensing heaters will lead to significant savings in natural gas. But here again not everything is so simple.
Condensate from burned gas is a chemically active liquid. Not all materials can withstand it. That means that both the heat exchanger and the chimney must be made of appropriate materials. And this leads to higher for heating equipment. In addition, the condensate will have to be discharged somewhere. Here too, problems can arise.
For example, in the septic tank and sewage system active liquid can not be discharged. And that means you need additional equipment, with which you can neutralize the condensate. Plus, you can’t do without consumables here either.
There is another nuance that you have to consider when buying a condensing gas boiler. It does not work well in a high-temperature heating system. Typically, it is a radiator variant. The thing is that the temperature of the water at the outlet is 50C. In contact with the heat exchanger, where the water is not below the designated value, condensation occurs poorly. And that means that there will be little heat energy released. That is, the efficiency of the unit will fall. It will not be bad, but not the maximum.
But if there is underfloor heating in the system, the condensing models are at their best. Because this type of heating requires water with a temperature no higher than 30-35C. Therefore the condensation process on the heat exchanger is also more efficient.
That is why manufacturers of condensing boilers in the data sheets put two efficiencies: for the system with a temperature of 30-50C and for 50-80C. That is, it turns out that if there is a question of which type to choose from the two above-mentioned, it will all depend on what type of heating is installed or planned to install in the house.
Technologies to save gas for heating
For us it is not so important to understand all the features of this technology, it is important to know and understand its essence. condensing boilers use as much as possible the energy of the outgoing gases formed during the combustion of gas fuel.
Due to the fact that engineers manage to remove additional energy from the outgoing gases, the temperature of the gases drops, and the efficiency of the boiler increases.
And at the moment the most economical gas boiler for heating a private home is condensing.