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Boiler needs topping up every day

Boiler needs topping up every day

Why does my boiler need topping up everyday?

Are you finding that you are having to top up your boiler pressure every day? If so, read on to find out what could be causing this system fault and whether you need to call a heating engineer.

What is boiler pressure?

Modern boilers heat cold water which flows around a circuit of pipes and radiators through your heating system in your home. For this to happen the water pressure needs to be kept stable.

How often should I need to top up my boiler?

When the heating system is cold, the pressure should ideally be between 1 and 1.5 bar. If the pressure is too low i.e. below 0.5 bar then water has been lost from your system which needs replacing. If the pressure is too high this can indicate there is too much water in the system. As a first step you can bleed a radiator until the gauge returns to the normal limits of 1 – 1.5 bar.

If this does not solve the pressure problem or you are still having to top up your boiler frequently then it is important to get to the root of the cause to protect your boiler from damage.

Causes of a rise in pressure?

Aside from having too much water within your system, high pressure can indicate your expansion vessel requires re pressurising. In this instance you will require a heating engineer.

If you are ever in doubt with any aspect of your boiler or heating system you should ALWAYS contact a registered heating engineer.  It is normal for a heating system to be topped up once or twice a year.  For example this could be done during your annual boiler service. If you are having to top up your pressure frequently then you should call an engineer.

Causes of a drop in pressure?

A loss in boiler pressure can be caused by a variety of things. Commonly a loss in pressure is caused by a leak in your heating system or if you have recently bled your radiators.

Leaking system

Even a tiny leak can cause a large pressure drop if left unnoticed. Noticed a drop in pressure? Have a look around your home for any damp patches around your radiators or boiler. You should never look for a leak inside your boiler only a qualified gas or oil engineer should do this.

Other signs for an ongoing leak could be;

  • Mould appearing, rot in extreme cases
  • Peeling paint rust marks
  • Swelling or bulging of floor boards or ceilings

However, it is not always easy to find a leaking pipe especially if it is behind a wall or panelling.

In summary if you are in any doubt about your boiler pressure you should always contact a registered heating engineer. Failure to do so could result in unnecessary damage to your boiler and heating system which could result in a costly repair. Please also see our article on how to re pressurise your boiler


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