How to raise the pressure in the boiler Bosch

How to raise the water pressure in the boiler Ariston?

Nitrogen or air pressure in the tank must be within 0.8 bar. If your heating system contains a large amount of water. more than 100 liters. you need an additional expansion tank.

How to pump air into the expansion tank correctly

Disconnect the boiler from the network. Shut off all taps in the boiler, supply, return, cold water inlet. The pressure in the boiler must be zero. Connect the pump with a manometer to the expansion tank through the slide valve. the drainage nozzle is open.

The pressure in the boiler drops: how to raise

The nominal pressure in the system ensures normal circulation of the heating fluid and pressure in the taps. But what to do if the pressure drops in the two-circuit boiler? Why this happens? The main reasons:

  • improper installation,
  • The mismatch between the boiler capacity and your piping,
  • leakage,
  • radiator damage,
  • Gas supply interruption.

Let’s consider how to raise the pressure and what to do when the boiler does not hold it.

Pressure types

Why the pressure drops in a wall-mounted appliance? First let’s understand what kinds there are and how they affect the operation of equipment.

  • Static. The higher the height, the higher the performance. Every meter increases by 0.1 bar.
  • Dynamic. Forced operation of the pump produces a nominal head in a closed system.
  • Operating. Includes the above two options.
  • Excess. Determined by the pressure gauge as a difference between the ambient and the detected value.
  • Nominal. The one specified by the manufacturer in the documentation for a particular model.
  • Maximum. That maximum allowed to avoid breakdowns and accidents.
  • Pressurized. Used in manufacturing when inspecting equipment.

The values in the heating circuit are measured in atmospheres. They may vary; it is important that the value does not exceed the maximum and minimum allowable thresholds. Low value is possible only when the coolant is pumped into the circuit. In other cases, it should not deviate from the norm.

Pressure control in the gas boiler

All modern heating equipment is equipped with monitoring sensors. A pressure sensor monitors normal operation. In the event of deviations from the norm it sends a signal to the control module, and the boiler is blocked. In addition, an error code can be displayed.

What pressure should be? A manometer helps to monitor the values. A Bosch, Ariston, Navien, Baxi mounted unit in the house maintains values from 1.5 to 2 atm. Falling values are observed only in systems with forced fluid flow (pump).

How the equipment works

Under normal conditions, the work goes like this:

raise, pressure, boiler, bosch
  • Sensors detect the temperature of the heating medium. If an external thermostat is installed, the burner ignites automatically and heats up.
  • As the temperature rises, the pressure rises. Water expands when heated, so an expansion vessel is provided to discharge the excess heat transfer fluid. Safety valve also bleeds excess heat carrier into the drain.
  • If there is a malfunction, too much water drains. As a result the pressure drops.
  • As soon as the temperature reaches the set temperature, the boiler shuts down.

Learn more about how the expansion tank works:

  • The tank consists of two parts divided by a diaphragm. In one cavity there is nitrogen, in the other cavity excess fluid accumulates.
  • The heating medium fills it up as much as the difference in the system and nitrogen values is large.
  • As soon as the heating stops, the nitrogen pushes the water out of the cavity by deforming the diaphragm.

Why the water pressure drops

  • The height of the shell installation, consequently the height and length of the pipes.
  • Fluid affecting pipes and other elements.
  • The design of the trunk lines.

If your home has self-contained heating, then the standards depend on:

Next we will look at causes unrelated to the installation. If the device resets and does not gain pressure, it may be an internal breakdown or external factors.

You refill the coolant in the circuit, but the pressure is still low. If the batteries are well heated, the moisture evaporates quickly, so the place of the leak is difficult to detect. Take a dry cloth and go over all the pipe joints, connections. Look to see if puddles are accumulating under the radiators.

If no leak can be found, use a compressor.

  • Disconnect the radiators from the heating device.
  • Drain all the liquid.
  • Connect a compressor to the taps.
  • Pump the circuit with air.
  • You will hear an odd sound in places where there is damage.
  • Use sanitary tow or sealant to seal it.

Your radiators are built into the wall? Then call in a specialist. They will check with a thermal imaging camera. You only have to open up the faulty area and repair it.

Incorrectly selected boiler. the capacity does not correspond to the set parameters of the pipeline. Therefore the pressure constantly falls and does not hold.

If the values drop quickly, the cause could be in the expansion tank. You pour the coolant every week, but it becomes less and less, although there are no leaks. You can also observe pressure drop in the faucets.

  • Turn off the water valves.
  • Drain the circuit completely.
  • Open the nozzle on the expansion tank (RB) and fix the figures.
  • Pump in air until all the water comes out.
  • Bleed the air and repeat the action. Make sure the gauge needle does not exceed 1.3 bar.
  • Open the taps and fill up with liquid.

If after the procedure the pressure drops and does not rise, inspect the diaphragm for damage. Replace it if necessary.

Malfunction of the heat exchanger. No irregularities detected after checking the tubes and connections? Inspect the radiator for damage. Large accumulation of scale on pipes leads to frequent flushing with reagents. This causes rapid material deterioration and cracking.

Bithermal unit cannot be repaired because of the design. Will need to be replaced. If a tubular radiator is installed, remove it. Fissures can be detected by green spots on the surface. Dry the device, clean the damaged place with sandpaper. After soldering with a soldering iron or burner.

Unfortunately, the assembly will not last long after repair. Therefore, sooner or later you will have to replace it.

Expansion vessel and its pumping

In a closed system the cause of pressure drop in the circuit can be a failure of the expansion tank.

  • Frequent feeding of the system. If there is a requirement to additionally introduce coolant into the system at least once a week without any visible leaks, the problem is due to the expansion vessel not working properly;
  • Scatter of manometer readings for different operation modes of the system. Sharp drop of the coolant head in the system when using hot water supply is also indicative of malfunction in the RB.

Pressure inside the expansion tank

To check the functionality of the tank should be pumped and check the pressure in it corresponds to the pressure in the heating system.

  • Close the stop valves (forward and return flow);
  • Open the nipple, drain the water until the pressure value in the boiler is equal to zero;
  • Take a reading on the expansion tank in the “open” position on the nozzle. Presence of condensate on the expansion tank should not be observed;
  • Blow air into the DH pump until no more fluid escapes from the connection. To allow water to flow out of the tank completely;
  • Release the air;
  • Repeat the procedure, keeping the pressure in the DH at 1.11.3 bar;
  • Open shutoff valve;
  • Start the heating medium in the network. Set the pressure level to 11.1 bar.


In the absence of a special pump for DH a normal bicycle pump can be used.

Pressure in the heating system. standards, indicators, how to raise or lower

The central heating systems of multi-storey municipal buildings and detached houses have not only significant design differences, but also different physical characteristics of the heating medium used. When designing in-house heating systems the main design criterion is the pressure in the heating system, the parameters of which have a significant impact on the correct functioning of the entire heating.

In individual residences for heating stand-alone systems are used, which includes a variety of equipment, when filling the circuit with heat carrier independently, it is important to maintain the correct head parameters. Control and regulation of the pressure within prescribed limits during operation of the heating system will ensure the longevity of its operation, optimize the consumption of thermal resources, increase the efficiency of heat exchangers.

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There are different types of Bosch 24kW boilers:

  • Atmospheric. Air supply and smoke evacuation occur naturally.
  • Turbines. They have a sealed combustion chamber with forced air extraction and smoke extraction using a special turbo fan.
  • Single-circuit, designed only to supply the heating network of the house.
  • Dual-circuit, capable of supplying domestic hot water in addition to heating.

All single-circuit models have the ability to connect the boiler indirect heating, which expands their capabilities and allows you to get the full set of functions.

Why does the water pressure drop in the heating system??

The main reasons are: leaks in the heating system, malfunction expansion tank in the boiler, lack of built in expansion tank volume of the heating system, faulty pressure gauge or pressure sensor, leaks DHW heat exchanger or bi-thermal heat exchanger (flow between the heating and.

There are several common causes of pressure drop in the gas boiler: The expansion tank malfunctions. Problems with electricity or its long absence. There was a leak from the heating system.

Proper service of gas boilers Buderus: how to make adjustments and regulation, how to turn on the device and fix errors

Popularity and high demand for gas boilers Buderus are partially based on the relatively low cost of equipment.

But the main factor stipulating the preference among users is a high level of construction and assembly, traditional German quality of components, accuracy and thoroughness of development.

Most owners, after buying a boiler, are not ready to operate such equipment by virtue of the outdated approach to the operation of heating products.

In the minds of people prevails the idea that the boiler is enough to turn on, no additional measures are required.

However, complex technology requires an understanding of the logic of the developers and design features, otherwise you can not achieve high efficiency and long service life.

How to set the gas boiler Buderus

The basic setting of Buderus boilers is made in the factory. After purchase, it is only necessary to make some adjustments necessary for the most efficient operation of the unit under given conditions.

As a rule, the operating limits for gas pressure and DHW (heating water) temperature need to be set.

Adjust the gas supply parameters using the adjustment screws on the gas fitting while monitoring the result on the control panel. Connect a U-manometer to the measuring connection, which defines the gas pressure limits.

Start the service mode 1 for this time.2.F (maximum output).

Setting the temperature is performed from the control panel. Pressing the “-” button activates the winter mode (heating circuit is on).

Then press the “OK” button, the display will then show the temperature of the WV (direct, or supply line).

Use the “” or “-” buttons to set the necessary values and press the “OK” button again.

To set the summer mode follow the same steps, only when setting the value press the “-” button until the display shows dots. Then press “OK”, the display will be permanently lit with a crossed out heater icon, indicating that the heating medium does not function.

How to start the device correctly

The first start-up is performed after all pipes have been connected:

In addition, it is necessary to connect the power supply, using a special socket with a grounding electrode.

Electronics of the boiler is very sensitive to power surges or spikes, so it is important to protect the control board from them.

It is necessary to use a standard voltage regulator, produced by Buderus, or similar (which is somewhat worse).

Start the boiler either when it is first turned on or after the summer break.

In both cases it is necessary to fill the system with water first. Checking the manometer, fill the system up to the value of 0.8 bar. The standard operating pressure is 1 to 2 bar, but note that when the water heats up, the water volume increases, causing the pressure to rise.

After that set the required temperature of the coolant on the control panel, which will start the burner and start the boiler.

Before switching on it is necessary to bleed the radiators with the help of Maevsky cocks., otherwise an error will be displayed at start-up. Reset it by pressing and holding “ОК” button, after which the attempts shall be repeated until a positive result is obtained.

Do not fill the hot heat exchanger with water, as this can cause cracks and damage the unit. Wait until the boiler has cooled down before filling the system.

How to turn on after the shutdown

Turning on the boiler is done by pressing the appropriate button. If the cutoff occurred due to external reasons (no gas in the mains, water or electricity blackout), you must first make sure that the necessary resources are restored.

Worcester repressurising. no key and no hose!?

raise, pressure, boiler, bosch

In case of failure of any nodes or parts, causing the boiler shutdown, you must first eliminate the cause. replace or repair the problematic node or part, restore the oxidized contacts, etc.д. Otherwise the boiler will not start, the installation will be immediately blocked by the self-diagnostic system.

Main malfunctions

Buderus boilers are designed on the basis of the most advanced technical developments.

They are stable in operation, but there is no insurance against a malfunction yet. Buderus boilers are equipped with self-diagnostic system, which is a network of sensors connected to the most important and critical units or parts of the boiler.

Operation of all elements is constantly monitored by these sensors, if there are any discrepancies or changes in the normal mode, the display shows an alphanumeric code of this or that error. Other faults are also possible.

Let’s consider the most common ones:

  • The burner does not ignite. Reasons can be disabled starters of heating system or control systems, failure of automatic devices of protection, failure of regulator or limiter of boiler temperature. Possible boiler lockout due to problems with the flue gas control equipment.
  • Burner starts, but immediately generates an error. Most often the problem is a closed gas valve, or air in the gas line. In both cases it is necessary to open the valve and bleed the air.
  • No ionization current signal appears after the start of the burner. Generally problems are caused by oxidized contacts or the “N” and “L” electrodes mixed up. It is also possible that the ionization electrode is shorted to the body or that the automatic burner control is broken.
  • After ignition, the burner gives an error. current less than 1.5 mA. Here the cause may be oxidation or soot on the ionization electrode, which should be cleaned.
  • Boiling sounds can be heard from the heat exchanger. This is a sign of a thick layer of limescale or insufficient quantity of coolant in the system.


Protection autodiagnostics, gas control, overheat protection, antifreeze mode, safety valve, air vent, protection against pump blocking

The holes are detected visually, by pumping water into the piping up to a predetermined level, and the cycle is stopped. The most susceptible to leaks are the pipe joints, shut-off valves, radiator connections and the boiler itself.

One of the causes of pressure drop is leakage at the joints of the pipe and radiator

  • Presence of corrosion on metal tubes and connections;
  • Poor quality installation of the pipeline;
  • Loosening of joints;
  • Damage to the pipe due to mechanical impact.

Fixing the problem

If the connection is damaged, the fitting or the connection itself is replaced. If the leak is detected (with a special scanner) in the pipe behind a decorative partition, wall or under the floor, it is necessary to dismantle the surfaces and make repairs.

Why does the pressure drop in the gas boiler: the causes of pressure drop in the boiler and their elimination

Most often, users of even the highest quality devices encounter problems in their performance and do not know what it is related to. The most common is a significant reduction in pressure. However, this only occurs in systems with forced circulation. In the case of natural, another defect can occur. In this article, we will analyze the main points of the first of these situations, which every owner of a gas boiler should know.

What should be the norm of water pressure in the gas boiler

Of course, it is necessary to monitor the optimum parameters, at which the process of work goes most effectively. When assembling the structure, manufacturers build in a special apparatus that allows you to monitor the indicators. The information that it collects can be noticed on the panel and, based on this, analyze. So the ideal measurement is considered to be one and a half to two atmospheres. If it shows a number greater or less than the named interval, respectively, it indicates the presence of malfunction.

In addition, it is worth remembering that there are several types of pressure:

  • Static. With it, the indicators of the heating system are at rest.
  • Dynamic. Runs through all elements of the design.
  • Maximum. The device can stop working if the level turns out to be much higher.

Also the pressure tends to change from a lower to a higher reading as the unit heats up.

Why can the pressure in the gas boiler drop: common causes

To always be ready, even with sudden and unpleasant cases, it is necessary to know all possible sources, from which various difficulties can be formed. Let’s consider the main ones, the most common.

The boiler discharges excess air

The reason for the occurrence may be the fact that you have not previously used the device. Naturally, at the first startup, the unit will eject excess air mass. Such an independent action can be explained by the presence of automatic air vents. If you have a purchase with a wall catch, you can turn the screw specially designed for ejection. Then air will go, followed by water. It is necessary for further operation.

In the expansion tank there is an air escape

Air leakage can be due to the following reasons:

  • Failure of the compensator, hence it will not provide maintenance of the specified head.
  • Loss of tightness of the tank. Because of this the atmosphere is thrown out of it. Subsequently, you may notice a lightning-fast drop in blood pressure.
  • Do not forget about the cases arising from prolonged operation. a rupture of the membrane, which is located inside the tank. It is very difficult to rupture, but there is a possibility of occurrence, so it is easy to recognize.
  • The next cause may be the spool. It is located on top of the device and gradually bleeds air. Such a process can take place from several months. As a result, an unfavorable outcome of events is possible. the elimination of the entire air mass and filling the entire expansion unit with coolants.

The heating system is leaking

Perhaps the most unpleasant situation is a leak, because the water begins to splash immediately or manifest itself gradually. In any case this will sooner or later become noticeable to others. Occurs due to damage at the top or bottom of the water floor heating. The correction of what has happened is a long and costly process. But nothing is impossible.

Why else can the pressure drop in a two-circuit heating boiler

Not only the above-mentioned points deserve attention. Other problems are also distinguished:

  • If the operation time exceeds a sufficient amount of time, it is likely that the automation of the boiler is just out of order. Because of this, microscopic cracks are also possible, which are sometimes difficult to see with the naked eye.
  • When crossing pipelines, the device being used can leak.
  • The boiler is not suitable for use due to improper selection.
  • Poor installation of the entire heating system.
raise, pressure, boiler, bosch

Why is the pressure in the boiler dropping, if there is no leakage

Of course, in addition to the main problems, there are also indirect problems. For example:

  • The formation of so-called airlocks. They can be caused by improper use of the bleeding valve. it becomes clogged or the regulation is incorrect.
  • Also, due to violation of technical requirements, when filling the coolant systems can form low pressure.
  • Poor sealing also contributes to the entry of air into the system.
  • Atmospheric suction when connections are found to be loose.

All of the above sources are accompanied by characteristic noises and sounds. Therefore, they can be identified quite easily and proceed to fix them. Otherwise, it will follow the emergence of new problems, with which it will be much more difficult to cope. In addition, there can be not only discomfort for the occupants of the structure, but also a danger to the surrounding people.

How to raise the pressure in the boiler depending on the cause of the problem

Here are a few recommendations on how to fix the problem

  • The most common is a leak. It is recommended that the entire construction be inspected as thoroughly as possible to find the point of origin. If detected, the next step is to disconnect the unit from the system. If a pipe is damaged, it must be replaced: remove the old pipe and replace it with a new one. The same maneuver is desirable if the muffler is damaged. If there is any corrosion at pipe joints you can seal the area.
  • It is always advisable to carry out preventive measures beforehand. This will ensure protection against air s. Pay attention to the correct connection of the heating structure, as well as all possible valves and components. Always check the correct functioning before starting work. Checking is as follows: through the compressor to apply pressure and observe the parameters. If it does not loosen in 30 minutes. everything is fine.

Checking your system pressure on your Worcester Style boiler

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