Does Boiler Pressure Drop: Reasons & 9 Facts You Should Know


In this treatise, the topic “does boiler pressure drop” with Reasons & 9 several facts will be prate in a brief manner. Boiler loosing pressure it is a very simple occurrence and overtime.

The pressure of the boiler can be lower. The process of lowering the pressure of boiler are listed below,

  • In the first step of the process the boiler should be shut off and make sure that the boiler should be fully cooled down.
  • In the next step heat should to be shut off and wait until the radiators to completely cool down.
  • After that a container and a towel need to place under the bleed valve. If we not placed a container and a towel under the bleed valve then accident can be happened due to hot air and hot water especially in case of if we don’t allow enough time to completely cool down the radiators.
  • Unfix the bleed valve. A hissing sound can be come out for the reason of realising hot air and hot water.
  • When the sound of hissing is stopped need to secure the bleed valve.

Is it normal for boiler pressure to drop?

Yes, to drop the pressure of the boiler is very normal. Most of the cases near about 99% dropping the pressure of the boiler means there should be a leak is present. In some cases fault of the pressure gauge leak also can be happened, in some cases in our naked eyes leakage could not identify clearly but certainly leakage is present in somewhere of the boiler system or heating system.

Image – Diagram of a water-tube boiler;
Image Credit – Wikipedia

Why does boiler pressure drop?

Boiler pressure drop means dropping the amount of water which is circulating in the heating system or the boiler system.

The reason behind the pressure drop in the system of the boiler is listed below,

  • Leakage is present in the boiler
  • Leakage is present in the system of the boiler
  • Broken parts of the boiler
  • Fault is present in the pressure relief valve
  • Damaged expansion vessel
  • Bled of the radiators

Leakage is present in the boiler:-

If leakage is present in the boiler then the pressure dropping appear. Leak can be appear in various parts of the boiler such as joints of the rings, automotive air vents, diverter valves and also in the washer for this reason the heat exchanger also can be defected. Bigger size leak can’t be miss, boiler will drop out from the bottom section but smaller size leak sometimes can be neglected because the dripping of water can be end up another part of the boiler.

 Leakage is present in the system of the boiler:-

If leakage is present in the pipe system of the boiler then this leakage also can be causes pressure dropping of the boiler or heating system. When leakage is appear a quick investigation is needed to find the particular place from where the water is dripping. Mainly around the bends and joints leak can be occurring.

Broken parts of the boiler:-

The reason behind the pressure drop in the system of the boiler is broken parts are present in the boiler. If excess amount of pressure is dropping then we need to understand that some parts should be broke and it can be identified by the monitor of the boiler.

Fault is present in the pressure relief valve:-

The purpose of using pressure relief valve is when the excess amount of pressure above the 3 bar is crosses that time the pressure inside the boiler exist by the pressure relief internal valve and pressure relief external valve. But when the leakage is present in the pressure relief valve the pressure could not release in a proper way and pressure is dropping in the system.

does boiler pressure drop
Image – Schematic diagram of a conventional spring-loaded pressure relief valve;
Image Credit – Wikipedia

Damaged expansion vessel:-

If defection in present in the expansion vessel in that case the pressure will be arise up to 3 bars when boiler heat up. Expanded water could not get enough space to flow as a result from the pressure relief internal valve and pressure relief external valve the excess amount of pressure is exit and pressure drop is appear in the boiling system or heating system.

Bled of the radiators:-

Another reason behind the pressure drop in the system of the boiler is bled of the radiators. Identification and fixing the issue of bled of the radiators is not too complicated.

How often should boiler pressure drop?

When the system of the boiler or the system of heating is cold, the pressure should be stand in between 1 bar to 1.5 bars. If the amount of pressure drop is lower than the ideal one (near about 0.5 bars) in that case water shortage is appear in the system and the whole system need a replacement.

If the pressure is continuously drooping from the system of the boiler or system of the heating then we should to follow some steps they are listed below,

  1. In the first step of the process the boiler should be shut off and make sure that the boiler should be fully cooled down.
  2. In the next step the both edges of the filling loop double checking is necessary thus they should securely connect.
  3. Open the both internal valve and external valve to deliver cold substance water into the system of the boiler or system of the heating.
  4. Wait until the range of the pressure gauge comes to the read point of 1.5 bars.
  5. Close the both internal valve and external valve step by step.
  6. If boiler back required then reset button is pressed.
  7. In the final step the both edges of the filling loop unfurl and remove.

Does boiler pressure drop in summer?

Yes, during the season of summer boiler pressure drop is happened. Dropping the pressure is a very common and normal matter almost every time pressure is drop due to many reasons.

In the system of the boiler the pressure can be drop for the leakage of the boiler any others parts of the boiler if some fault is present. Mainly during the water circulation of the system water is expand that time water could not enough space to circulate and relief valve is open to normalize the inside condition of the boiler at that particular time pressure is also dropped.

Does boiler pressure drop in winter?

Yes, during the season of winter boiler pressure drop condition can be observed. Dropping the pressure is a very common thing almost every time pressure is drop due to many reasons.

The reason behind the pressure drop in the system of the boiler is broken parts are present in the boiler. If excess amount of pressure is dropping then we need to understand that some parts should be broke and it can be identified by the monitor of the boiler, we need to take help of experts.

Does boiler pressure drop when heating off?

Yes, in the system of the boiler pressure is drop when heating is off. There are two main problems that typically cause a loss of pressure – water escaping somewhere in the system or a failure of the expansion valve and resulting damage to the pressure relief valve.

Why does boiler pressure drop when heating is on?

The reason behind the pressure drop in the boiler when heating is on are listed below,

  • Leakage is present in the boiler
  • Leakage is present in the system of the boiler
  • Broken parts of the boiler
  • Fault is present in the pressure relief valve
  • Damaged expansion vessel
  • Leakage is present in the boiler

Does boiler pressure drops when running hot water?

Yes, in the system of the boiler pressure is drop when hot water is running.

Why does boiler pressure drop overnight?

The most common reason for dropping the pressure overnight is releasing the water or air from the radiator when it is bleeding. The issue of the bled of radiator is not a major problem with little bit awareness and repairing the problem easily can be fix.

The other reason of the pressure drop in the system of the boiler is listed below,

  1. Leakage is present in the boiler
  2. Leakage is present in the system of the boiler
  3. Broken parts of the boiler
  4. Fault is present in the pressure relief valve
  5. Damaged expansion vessel

Why does boiler pressure drop every day?

The most common reason for dropping the pressure everyday is releasing the water or air from the radiator when it is bleeding. The issue of the bled of radiator is not a major problem with little bit awareness and repairing the problem easily can be fix.

If leakage is present in the pipe system of the boiler then this leakage also can be causes in an everyday manner pressure dropping of the boiler or heating system. When leakage is appear a quick investigation is needed to find the particular place from where the water is dripping.

If by a small investigation the leakage of the system can be identify then it’s okay but if not then skilled person required to fix the problem. Mainly around the bends and joints leak can be occurring.

The symbol for leak present in the system are listed below,

  • Mould appearing
  • Bulging or swelling of ceilings or floor boards.
  • Peeling paint rust spot

Conclusion:

If the pressure of the boiler is low that we can measure with the help of pressure gauge or discussion with boiler manual.

The leaks are checked in the surrounding of the radiators connection of the pipes. Water stain and discoloration of the pipe is the sign if the leakage in the pipes.

A expert hand needed if required to recover internal parts fault.

Indrani Banerjee

Hi..I am Indrani Banerjee. I completed my bachelor's degree in mechanical engineering. I am a enthusiastic person and I am a person who is positive about every aspect of life. I like to read Books and listening to music.

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