In the present time, buyers are available models of columns that do not require the presence of a vertical chimney. They are called turbocharged and the main difference between such columns is the forced ventilation through a coaxial pipe, which can be led out through the wall into the street. Through this pipe combustion products are simultaneously removed from the heater and air is pumped from the street.
Why it is often used in dachas?
For dachas, the choice of the heater, which uses gas from a cylinder as source of energy, is often the only way to get hot water in dacha conditions. In situations where the dacha is not connected to the main gas pipeline, and there are problems with the electricity grid, this type of gas heater will be a real salvation.
Principle of operation
The main function of gas boilers is heating water in the shortest possible time. It looks like a housing in which there is a gas burner, combustion chamber, heat exchanger.
In a liquid gas heater, the water is heated while it flows through the heat exchanger, which in turn is heated by the burner. In addition, the device has such elements as: the water cooling system, control unit, temperature, pressure and draft sensors. Thanks to the electronic safety system, the operation of the column is monitored throughout.
Water heater Electrolux GWH 265 ERN NanoPlus
How to choose a gas water heater: selection guidelines and rating of the best models
The choice of gas equipment must be approached in terms of safety and reliability. Buying a cheap water heater can have fatal consequences for its owner. It is necessary to get acquainted with the basic requirements for the maintenance of gas equipment. Agree?
We will tell you how to choose a gas water heater to buy the perfect unit. In the proposed article we describe all the criteria that can affect the choice of gas wall-mounted equipment. We have popular among consumers models from proven manufacturers.
Connection to a cylinder of liquefied gas
First of all, you need to make sure that your gas heater is configured to use the gas that is present in the cylinder. If required, carry out work on the readjustment of the column with the replacement of the nozzles of the collector and to assess the tightness of connections. The date of readjustment and the type of gas that can be used in the device must be necessarily marked on the equipment.
Cylinder, which will be connected to the gas column, must be equipped with a reducer with a stabilization pressure of 300 mm water.st., as well as the minimum vapor phase capacity of 1 m³ per hour. Also pay attention to the selection of the hose. its length should be up to two and a half meters, and the inner diameter should be 12 millimeters. It is important to buy a hose that will withstand the work with the speaker on a gas cylinder.
How to connect a gas boiler to a cylinder of liquid gas
When installing the hose it should not be kinked and twisted. If the hose has to be installed with a bend, use adapters and take care of the bend radius (it should not be less than 90 mm in its outer line). In addition, the hose should not bend within 50 mm of the ends of the tips.
Installing a gas stop tap should be carried out in front of the column, so that it was easy to get to this tap. After installation work is complete, the hose and other connections should be checked to detect leaks in a timely manner. Only after that the water heater can be used to heat water.
Gas cylinder. 100% dacha option
Often, the flow-through water heater running on gas cylinder. the only way to heat water for dacha. Of course, no one cancels the summer shower with natural heating from the sun, but what to do in winter? Exit. a boiler or a gas boiler.
As for the electric water heater, it is not always possible to make a choice in its favor for a simple reason: not all dacha settlements have an ideal power grid, which would work without failures and not annoying power surges. This is partly the fault of those who use electric motors for irrigation, electric saws, air conditioners and other powerful appliances. Boilers or electric instantaneous heaters are not always the best solution.
Cylinder gas mixture is not a problem to get. over, most domestic manufacturers (and not only) produce gas equipment, which works regardless of whether the gas used. conventional or liquefied.
The difference between liquefied and natural gas
Everyone knows that methane (CH4) prevails in the composition of liquefied petroleum gas mixture (hereinafter LPG). hydrogen (H) in it is about 55%, so per unit mass methane generates more heat when burned than any other organic substance. LPG for boilers, water heaters and internal combustion engines is a homogeneous mixture of propane (C3H8) and butane (C4H10). The priority of natural gas over LPG is mainly in its cheapness. this parameter prevails even over the high efficiency of methane combustion.
- heat generation during combustion. 6,4 kW/1 dm3;
- under pressure, natural gas easily transforms into liquid phase, and vice versa;
- from LPG storage is pumped into standard cylinders or gas holders;
- For combustion in nozzles and cylinders of internal combustion engines, propane-butane is fed in gaseous form;
- As LPG is used, condensate is accumulated at the bottom of the tank as an unavoidable element that occupies the usable volume.
LP Propane gas mechanicals. Converting from Natural Gas
Tanks, where LPG is pumped never fill up. 20% of the tank is always left empty to allow the propane-butane to pass into gaseous form. In standard cylinders, the net capacity is 40 liters, while it is possible to pump 50 liters.
Advantages and disadvantages of cylinder heating
Heating with cylinder gas in a private home has advantages over other heating option, as well as disadvantages.
First, here are the undeniable advantages of heating with liquefied natural gas:
- high efficiency at significantly lower labor costs compared to solid fuel heating;
- The possibility of converting the gas boiler from an ordinary cylinder to mains equipment;
- absolute autonomy and independence of the cylinder system;
- long service life of the equipment (15-25 years);
- availability of demand for cylinders in the secondary market. the cylinders can be easily sold, if they are not needed.
In addition, heating with cylinders allows you to heat water in a private home for domestic needs.
Let us also list the main disadvantages of such a heating system:
- Cylinders should be refilled regularly, about every 2-3 weeks, which is inconvenient and expensive;
- in case of improper organization of the system gas consumption increases significantly;
- The need to create suitable conditions for the storage of tanks.
Thus, the organization of the heating system on balloons can be very dangerous, if you do not observe some conditions of operation of the equipment. Therefore, you can store the vessels only in a ventilated room under which there is no basement. It is best to place the cylinders in a separate structure.
Reasons and principles of boiler modification
From the first lines, we want to warn you that the work on the conversion of the boiler to another type of fuel should be performed by a master of the organization, which has a contract for the supply of gas and maintenance of equipment.
However, any host should know the essence and the stages of the process for elementary control over the actions of guest performers. And doubts about their competence sometimes justifiably creep up. So it is better to trace the implementation of the procedure, which, incidentally, depends on the safety of the house and homeowners.
It also happens that the representative of the gas service can not get to a remote place. In this situation, the home handyman, of course, will try to do everything with his own hands. But the inexperienced handyman in the gas field will be responsible for the result of his efforts, and the manufacturer’s warranty will be canceled.
Buying a gas boiler for domestic use, you get a device that is configured to process the main fuel variant. Centralized pipeline supplies us with a mixture of combustible gases, dominated by methane. Mains gas enters appliances with a natural density and pressure of 21 mbar.
Liquefied gas is the exaggerated name for a mixture of propane and butane, in which either the first or second component may predominate. It can be predominantly butane with a small admixture of propane, or vice versa, 99% dominated by propane.
The density of the liquefied mixture increases by a factor of 600. The pressure does not increase by as much, but it is still higher than natural gas, 30-31 mbar.
The types of gases on which the boilers operate are standardized. They are assigned codes, which the manufacturer indicates in the technical documentation. Thus, the boiler consumption of main gas is marked with the code G20. The possibility of operating the boiler with liquid mixture with a predominance of butane is designated G30, with mixture with a predominance of propane G31.
In order that the blue fuel performs its essential duties the gas flows through the nozzles into the combustion chamber. There, the gas is mixed with the air by a burner in proportions that are optimal for the type of fuel. This means that the burner must be fed with the necessary amount of gas for normal combustion.
Normal mixture formation is possible with a nozzle diameter suitable for its execution. The size of the feed holes determines how much gas at a certain pressure enters the combustion chamber at a specific volume of air. That is why nozzles with different nozzle cross section are installed for liquefied mixtures and for main gas.
Note that the nozzle size is determined not only by the type of gas, but also by the power of the boiler itself. For information, for a 10kW unit operating at maximum operating conditions, mains gas needs 1.2 m³/h, liquefied mix of any kind 0.86 kg/h.
The more powerful the equipment, the more fuel is required for its operation. The larger must be the size of the nozzles that let the blue fuel into the combustion chamber. Their section is clearly calculated and strictly regulated by the manufacturer, producing for a series of boilers of a given capacity burners with nozzles of a given diameter.
So how do you switch to LPG if you did not initially think to buy a boiler for LPG? Correct, replace either the entire manifold with the entire set of nozzles, or just the nozzles, leaving the manifold in place. The second option is not possible in all boilers.
In addition to replacing the LPG devices, the burner of an electronically controlled gas boiler must also be reset. It is necessary for full delivery of air in the volume required for the process of uninterrupted combustion. The new settings will also ensure that the gas supply is interrupted in the event of a risky situation.
You will also need to install a pressure reducer designed to regulate the pressure of gaseous fuel. The gas pressure regulator can be connected to one or more cylinders. You may need to change the gas valve, if necessary.
In any situation, before ordering a contractor to convert a wall or floor gas boiler to liquefied fuel, it is worth consulting with the gas service that oversees your equipment and gas supply to your facility.
They will tell you what devices should be bought for translation. Calculate how much the upgrade will cost you, along with the cost of the master.
How to determine if your gas stove works properly
When you light the burner, there should not be any extraneous sounds in the form of pops. The flame must burn evenly, its tongues must be blue-white, not without reason gas is called “blue fuel”.
If during combustion of the air and gas mixture yellowish impurities are observed, and the tongues of flame acquire a red tint, it is obviously a sign of improper operation of the nozzles.
When converting the stove from mains gas to cylinder gas, all of the above disadvantages are very characteristic. And plus there will be soot emission due to incorrect pressure. So immediately with the naked eye it is difficult to see, but it will manifest itself in the form of black spots on dishes after 1-2 days of operation.
Avoiding all these troubles is quite easy. It is necessary to correctly select the nozzles for the gas stove when changing operating conditions and the conversion to cylinder gas. It should be taken into account that due to the difference in pressure of the incoming fuel the diameter of the holes in the nozzles (nozzles) will also be different.