frequently asked questions about manometers and thermometers in heating

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Manometers and thermometers are essential components of every professional heating system, serving as the primary source of information for operators regarding the system's condition. Their correct function and accuracy directly affect the boiler's operational safety and the overall efficiency of the building's thermal management. In this section, we will examine the practical aspects of selecting, installing, and diagnosing these instruments based on real customer project experiences.

Selecting the correct measurement range for different types of boilers

The most common mistake when selecting a manometer is the installation of an instrument with an excessively high measurement range, which leads to low accuracy at the normal operating point. For standard domestic gas or solid fuel boilers, a range up to 6 bar is sufficient, where the needle moves in the second third of the scale for optimal readability during operation.

Gas boilers with a supply pressure up to 3 bar require a manometer 0 - 4 bar or 0 - 6 bar.

Boilers using solid fuels and heat pumps often operate at higher temperatures, so we recommend a range of 0 - 10 bar.

For variable-speed system pumps, an accurate manometer with a small range is critical, for example, an axial manometer 0 - 4 bar, which reacts to even small pressure changes.

Difference between axial and radial connections

Axial connections dominate in professional heating, where the inlet hose runs perpendicular to the front of the manometer, allowing for compact mounting on the front of the boiler or distributor without the need for long connecting pipes.

Conversely, radial manometers have an inlet from the back and are suitable only for specific applications where a certain distance from the wall is required due to thermal load or mechanical damage.

Axial manometers (e.g., an axial manometer 0 - 6 bar) are the standard for modern boiler assemblies.
They reduce the risk of glass damage in the event of accidental impact by tools during maintenance.
They simplify installation in tight boiler room spaces where space is limited.

Integrated thermomanometers vs. separate sensors

Many technical solutions today prefer the combination of pressure and temperature in one instrument, which significantly saves space on the boiler panel and simplifies reading parameters during system startup.

However, a thermomanometer must be equipped with a dual calibration to prevent mutual influence of the sensors under extreme temperature conditions, which is a common problem with cheap models.

For simple domestic boilers, we recommend an axial thermomanometer 0°C - 120°C 0 - 6 bar.
In industrial applications, it is better to use a separate thermometer for higher temperature measurement accuracy.
A separate thermometer (e.g., an axial thermometer 0°C - 120°C, 100 mm) has higher sensitivity and longer service life in aggressive environments.

Common faults and diagnostics of zero readings

One of the most common situations technicians deal with is when the manometer reads zero, even though you know the system is pressurized and the boiler is running.

This phenomenon is caused by clogging of the capillary with deposits, freezing of the liquid in the system, or mechanical damage to the spring, which requires immediate replacement of the instrument.

Check whether the inlet hose or the connection screw to the boiler is clogged.
Verify whether the manometer is exposed to excessive thermal stress, which may have deformed internal parts.
In the case of a persistent problem, it is necessary to replace the manometer with a new one, for example, an axial manometer 0 - 10 bar, which has a more robust construction.

Maintenance and Calibration in Professional Heating

Pressure gauges in commercial and industrial systems must be regularly inspected in accordance with current standards, with the interval depending on the frequency of use and type of fuel.

For standard domestic boilers, a visual inspection once a year is sufficient, while for public buildings and industry, calibration by a certified laboratory every two years is mandatory.

Always use original parts and calibrated test instruments when replacing.
After gas exchange in the boiler, it is necessary to manually set the pressure gauge to the current operating pressure.
Ensure that the pressure gauge is protected against vibrations and mechanical damage during maintenance.

Frequently Asked Questions

Why does the pressure gauge show zero even though there is pressure in the system?

This is the most common error caused by clogging of the capillary with deposits or freezing of the liquid in the system, which requires immediate replacement of the device.

What diameter and type of connection should I choose for a 63 mm pressure gauge?

The standard solution is a G1/4" connection, which is compatible with most domestic boilers and distributors, while the axial type is suitable for compact mounting.

Is a pressure gauge with a thermometer better or a separate thermometer?

For home use, an integrated thermopressure gauge is sufficient, but for precise temperature monitoring in industry, it is better to use a separate thermometer with a larger range.

The correct selection and installation of a pressure gauge is a key factor for the safe and efficient operation of your heating system, as it provides essential data for optimizing fuel consumption.

Whether it is the replacement of an old device or a new installation, always follow the boiler manufacturer's instructions and comply with the pressure vessel standards.

Do you have a question on this topic?

Not sure or dealing with a specific situation in your home? Write to us – we are happy to help.