- Single-circuit or dual-circuit?
- Floor or wall?
- Boiler output
- Type of ignition
- Condensation or conventional boiler?
- Traction type
- Control system
More than half of the boilers in the modern market are gas. Such popularity they deserve due to a number of advantages, among whicheconomy, convenience and ease of control, efficiency, noiselessness, small size, practicality and many others. In those houses, where the gas pipeline is connected, such boilers become the best option for organizing heating in a dwelling, and sometimes even, they cope with the function of supplying hot water. The modern range of gas boilers is so great that anyone canfind a suitable model. It is important only to immediately determine the requirements for the boiler: it must be single-circuit or dual-circuit, floor or wall, volatile or stand-alone.
It should be noted that even though the gas boiler is central to the heating system at home,the gas pipeline also deserves attention, which should be as safe as possible. Usually, residential buildings are connected to low-pressure gas pipelines, but many private houses can be connected to medium-pressure gas pipelines, and then one can not do without
When there is a certainty that everything is good with the gas pipeline, it is worth moving on to choosing the gas boiler itself.
Single-circuit or dual-circuit?
The difference between these two types of gas boilers is certainly familiar to many and follows from the name. So,single-circuitIt is able to heat water only for the heating system, and the two-circuit water, thanks to the presence of another heat exchanger or even a boiler, heats the water and for the hot water supply system. To proceed with a choice is necessary only from one's own needs and needs.
Since a single-circuit boiler only heats the heating medium for the heating system, an indirect type boiler can be attached to it to get hot water. Installation of a single-circuit boiler, as a rule, requires the use of an expansion tank, safety valve, circulation pump, which as a result, the device is quite massive, so it often provides a separate room - not every kitchen has a place like this system. And the whole process of installation is more complicated and time-consuming than in the case of a dual-circuit boiler. If you choose the boiler with built-in equipment, and for hot water use a hinged boiler, then Such a set will have a more aesthetic appearance, and it will occupy much less space, so it can be placed on kitchen.
Double-circuit boiler- the best option when you need to provide a house or apartment with heating and hot water, but you do not have an extra space for installing two different devices. Two-circuit boilers are compact floor or wall units with the size of a cabinet. At the same time, floor models are more interesting in terms of capabilities than their wall counterparts. The latter are excellent for small flats and houses: they take up less space and do not have the capacity to heat a larger area. Floor boilers can have a capacity of up to several hundred kilowatts, which means that they can provide a huge house with heat or even an institution, and at the same time to heat water for hot water supply with a speed of up to 33 liters per minute, which is more than enough.
Two-circuit boilers are also different in type of heat exchanger forSeparate and bimetric. The separate heat exchanger heats the water separately for the radiators and for the water supply system. Such devices are less sensitive to the composition of water and more durable. Bimetrical heat exchangers use as one container for heating water for two circuits, more depend on the quality of water, and with its increased rigidity can quickly fail.
Floor or wall?
To date, most boilers designed for single-family homes are wall-mounted. Boilers of high power, more than 30 kW, are executed in the floor version, although there are floor boilers with a rather small capacity. In general, there are options for every taste, and the choice depends on personal requirements.
Wall-mounted boilersthey are compact in size: they can be installed in the kitchen and in the bathroom without any special difficulties, and do not clutter up the premises. In a small box there is a whole boiler room with a burner, pumps, emergency group, expansion tank, etc. Manage these devices very much it is convenient, and as a rule, it is possible to adjust the temperature of the coolant that enters the batteries and the temperature for hot water if the boiler two-circuit. In this case, you can select a special summer mode, when the heating is only for the hot water system, and only when the cranes open. But most models of wall-mounted boilers are highly dependent on the supply of electricity, so those living in localities with regular problems with the presence of electricity, the choice of such devices should be treated with special caution.
Wall-mounted boilers can be both single-circuit and double-circuit, and the water in them is heated by the flow principle. Since such devices are constantly at eye level, it is important that they are attractive in appearance, so manufacturers are trying to develop the most stylish design.
The power of the wall-mounted boilers is considerably less than the floor ones and varies between 12-42 kW. Choose a device with a large margin of power is not worth it, because its price will be higher, and all the advantages you can not take advantage of, and even breakages you can run into.
Floor boilersare more suitable for rooms where there are problems with power supply, since they are often equipped not with electric but with piezopodging. In addition, they are very simple to operate, they can maintain the preset water temperature, they have reliable automation, which allows to cut off the gas supply if the flame in the burner has died out. But with hot water supply they cope a little worse than wall-mounted boilers: it is difficult to adjust the desired temperature, and it is difficult to name an economical heating system.
Floor boilers have a higher power than wall boilers. By the way, the final power largely depends on the type of burner chosen, and in similar devices it can beatmospheric or inflatable. The first are supplied as a kit, and the boiler in this case has a power of 10-80 kW, but sometimes slightly higher. An inflatable burner can achieve power of several hundred and even thousands of kilowatts, but it must be purchased separately.
As is clear from the key characteristics of floor boilers, they are installed in rooms with a large area. In small houses and apartments, its use is unjustified by the fact that such a boiler will take up space on the floor.
Boilers of all the overpowered types may have different capacities. The choice of a device with a specific power value should be based primarily on the area of the house. If you seek help from specialists, they will conduct the most complete calculations, take into account all factors and output the optimum boiler output. But you can try and manage on your own. So,For every 10 sq. m. of floor space, 1 kW of boiler power. Divide the known area of the house or apartment by 10 and round up the result in a larger side each can. Further to the result obtained, it is better to throw another 25% of the power, and already search for the unit with the desired value.
If the house is characterized by increased heat loss, then to the received capacity it is necessary to add another 25%. But in this case, do not interfere with the warming of the home, change the windows and doors, in general, do everything to make the house economical, and to pay less for gas.
As for hot water supply, then low-power boilers (up to 15 kW) on average heat about 12 liters of water per minute, which is enough for a small family. If 4 or more people live in the house, it is better if the boiler can heat 15 liters of water per minute and more, which is more than 20 kW.
A wishtake a cauldron more efficiently, so as not to bother with the calculations, can lead to undesirable consequences. A device that does not work at full capacity can also fail quickly, like a device running in an overloaded mode. The reasons for this may be mass, for example, the use of a pulsed mode instead of a continuous one, because a powerful boiler heats up quickly room, and then the automation switches it off, the chimney cools down, condensation forms there, which eventually leads to the need repair.
Type of ignition
To start the boiler to heat water, it is necessary to set fire to the gas. The most ancient and conservative way is to bring a match. Now there are few such boilers on the market, and the need for matches has been replacedpiezopodging. It is enough to press the button, as it produces a spark, which is necessary to start the combustion. Simple and convenient, but not very economical, and also takes time to manually turn on the boiler. But this option is independent of electricity and most suitable in those places where there may be problems with the supply of electricity. But since in snowy winters the breakages on power lines are not uncommon, then such a boiler becomes a very attractive option.
Boilerswith electric ignitionmore convenient to use, more economical. They are equipped with a water flow sensor on the main line, which provides information on the need to light the burner.
Condensation or conventional boiler?
Conventional boilers, which most in the market, burn fuel, and do not use its latent heat: the products of combustion, together with warm water vapor, simply go into the chimney and are eroded. But all this warmth can be selected and used in the heating system, which is realized in thecondensing boilers. In such devices, the exhaust gases are cooled, and the efficiency of the entire boiler is increased and sometimes reaches more than 100%. This may seem strange, but it follows from simple calculations based on approved procedures, which were adopted even when there were no condensing units yet. The magnitude of this indicator is due to the fact that the same resource is used in fact twice to produce heat. If you do not go into details, you can say thatCondensing boiler is about 10-17% more profitablethan usual, which means that it will use less gas, which is a serious basis for saving, especially in winter, although initially such devices will cost more.
Boilers can also differ in the type of traction. So, if the house already has a traditional chimney, then you can choose a devicewith natural draft. In this case, the combustion products are diverted through a chimney of a certain height. There are boilers withforced draft, they are also called turbine, because in their design there is a small fan (turbine), which allows you to remove all combustion products through a small pipe, for example, a wall. If there is no chimney in the house, then this option will be optimal, since it will save on its design and construction.
The temperature can be adjusted using the usualmechanical thermostatwith several modes: the user exposes a certain mode, and the water in the system heats up to the specified temperature, after which the heating stops. When the water cools, the burner is switched on again to the set power and heats the water. After including such a boiler for the heating season, it can not be turned off, but simply change the temperature regime.
More advanced areelectronic thermostats: with them you can accurately set the temperature, which is necessary in the room, and even consider the dependence on the time of day. Such devices are more economical, convenient, they always create an optimal microclimate, but also cost much more.
Finally it is worth noting that the gas boiler is an equipment of increased danger, therefore it requires special care andcompliance with safety regulations. Although almost all models are equipped with protection against the extinction of the flame, from the drop in gas pressure and other mechanisms, yet Before the beginning of each heating season the device must be inspected and tested, and for this purpose, specialists.