In this article, we’ll take a look at what an expansion tank is, why you may be experiencing a drop in boiler pressure, how to identify the problem, and why regular boiler inspection and maintenance is essential if you want to prevent more serious problems.
How to recognise that your boiler water pressure is dropping?
You may not easily notice a drop in boiler water pressure until it starts to manifest itself in lower heating output or a complete shutdown of the boiler. That’s why it’s important to know how to spot such pressure changes early to prevent bigger problems.
There are a few signs you should look out for:
1. Inspection of manometer
The manometer is the basic indicator of the pressure in the boiler. It is located directly on the boiler and usually takes the form of an analogue or digital indicator. The ideal water pressure of the system is between 1 and 2 bar, depending on the type and size of your heating system.
If the pressure drops below this value, it’s a clear signal that something is wrong. So, a regular visual check of manometer should become part of your routine, especially during the heating season.
2. Frequent switching on and off of the boiler
If you notice that your boiler is frequently turning on and off when it shouldn’t be, this could be an indicator of unstable water pressure. This is known professionally as ‘short cycling’ and is caused by the boiler failing to maintain a constant pressure in the system.
This condition not only reduces heating efficiency but also accelerates the wear and tear on the boiler and its components.
3. Insufficient heating performance
A drop in water pressure can cause your heating system to be unable to reach the desired temperature. Radiators can be lukewarm or cool to the touch when they should be hot.
This problem often manifests itself especially in the coldest months when your boiler is under the most load.
4. Water leaks from the relief valve
The relief valve serves as a protection mechanism that releases excess pressure in the system. However, if the boiler pressure fluctuates, the valve can release water even during normal operation.
If you notice wet spots or drops of water under the boiler, this may indicate that the pressure in the system is not stable. In this case, the boiler should be checked as soon as possible.
5. Increased frequency of water refilling
If you have to add water to the system frequently, this is a clear sign that the pressure in the system is dropping. This problem may be caused by a water leak or a malfunctioning expansion tank. Regular water refilling is not only impractical, but can also lead to other problems such as corrosion of system components.
Follow these signals
All of these signs should be warning signs that your heating system needs attention. By all means, don’t ignore them, as any problem with water pressure can lead to more serious malfunctions that require costly repairs or even replacement of the entire boiler. Regular pressure checks and preventative maintenance are so crucial to the long-term reliability of your boiler.
What is an expansion tank?
An expansion tank is an inconspicuous but crucial part of the heating system that helps maintain a stable water pressure.
Water has one interesting property – when it is heated, its volume increases. In a closed system like your heating system, this increase in volume causes an increase in pressure. This is where the expansion tank comes in.
It’s divided into two parts: One is filled with water from the heating system, and the other is filled with compressed gas, usually nitrogen or air. These two parts are separated by a flexible membrane.
- When the water in the system begins to heat up and increase in volume, the compressed gas in the expansion tank begins to compress, allowing the water to expand without dangerously increasing the pressure. In practice, this means that the expansion tank acts as a safety valve, ensuring that your heating system operates safely and efficiently.
- On the other hand, as the water cools and its volume decreases, the gas in the expansion tank expands and keeps the pressure in the system at a stable level. In this way, the expansion tank ensures that your heating system will not be subjected to extreme pressure fluctuations that could lead to damage or even failure.
How to solve the problem with the expansion tank?
If you find that your boiler is not maintaining a stable water pressure, it is likely that the problem lies with the expansion tank.
The first step is always to check the pressure. If you find that the pressure is not in the right range, you may need to re-inflate the gas or replace the membrane. However, these are tasks that you should leave to the experts to avoid further complications.
Use the services of specialists
So do not hesitate to contact our specialists who will guarantee you a comprehensive inspection and servicing of your heating systems, including the inspection and maintenance of expansion tanks. Our experienced technicians can quickly diagnose the problem and suggest the most appropriate solution – whether it’s a simple pressure top-up, replacement of a damaged component or complete boiler maintenance.
Regular servicing will give you the confidence that your heating system will run efficiently and safely throughout the winter. Don’t wait for problems – invest in prevention and ensure a smooth heating season.
