How to Repressurize a Boiler

Do you know how to repressurize a boiler?

Repressurize a Boiler

One of the most common causes of broken boilers is loss of water pressure. Low water pressure can be caused by several different things such as a leaking boiler. It is also possible to lose pressure when you bleed the radiators.

Low water pressure is easy to diagnose. Most modern boiler models feature a built- in pressure gauge that will show the boiler pressure. Before you start the steps to repressurize a boiler, first make sure that it indeed needs to be pressurized by checking the pressure gauge. This is usually found in front of the boiler. Generally, the ideal water pressure should be between 1 and 2 bars. Some models will show a red bar where the water pressure was initially set.

If the water pressure is incorrect, you may be able to repressurize a boiler by yourself. Knowing how to increase boiler pressure properly can save you a visit from your local engineer.

How to repressurize a boiler

  • Before starting, make sure the boiler is turned off and has cooled down.
  • Always read the manufacturer’s manual before repressurizing a boiler.
  • If the pressure is too low, you will need to top up your system.
  • Locate the filling loop – a flexible hose that is usually silver or grey, with a small valve on each end and usually located at the bottom of the boiler.
  • Make sure both ends are attached securely to both valves.
  • Open both valves either using your hands (if you can) or a flat headed screw driver.
  • When the repressurizing begins, you will hear the water filling the system.
  • Watch the pressure gauge closely. When it reaches 1.5 bar, close both valves.
  • Turn the boiler on or reset it, if needed.

As a precautionary measure, make sure you keep an eye on the pressure gauge as you repressurize. Over- pressurizing is just going to be another problem to take care of. If you cannot watch the gauge yourself, get someone else to help you.

If you are not confident that you can repressurize a boiler by yourself, get help from a gas safe registered engineer from RJ Gas.