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What happens if boiler pressure is too low?

Tuesday 13th October 2020

The most common type of boiler in UK households is a combi-boiler. These are used primarily for heating and hot water. Low pressure is a fairly common problem with combi-boilers, but without the necessary boiler service, this could lead to further problems. If you’re worried about your boiler pressure being too high or too low, then it’s advisable to contact a certified boiler engineer.

What are the causes of low boiler pressure?

The most common cause of low boiler pressure is a leak somewhere in the system. It could also be caused by bleeding any of your radiators or if the expansion vessel or pressure relief valve in your boiler is faulty. If you notice a leak anywhere in your home, you should contact a certified plumber immediately. It’s also recommendable to have a boiler service carried out regularly, as leaks can sometimes go unnoticed.

What happens if your boiler pressure is too low?

Low boiler pressure isn’t a serious problem and shouldn’t cause damage to your boiler. The main issue is, however, that it will affect the functioning of your boiler. This could have a detrimental effect on the efficiency of your heating system. If your heating isn’t working properly, this could also mean an increase in your energy bills. If you don’t use your boiler often, it can run out of pressure as well.

How do you tell if your boiler pressure is too low?

The pressure is displayed on combi-boilers on a gauge located on the control panel. There is both a red and green section on this gauge. The green section indicates safe boiler pressure, from 1-1.5. The red section is the maximum level of safe pressure. You should check this gauge frequently to ensure the needle doesn’t go below the green section. If you notice the needle has dropped below the level of safe boiler pressure, you will need to arrange a boiler service with a plumber or certified engineer.

What should you do if your boiler pressure is too low?

If your boiler pressure is too low, you should contact a plumber or heating expert. Alternatively, there are some things you can do at home. Check the manual for your boiler before carrying out any attempt to repressurise your boiler. Look for the filling handles which should be at a 90° angle to the flow of the pipe. Turn off the boiler, and make sure you have identified the pressure gauge. You can then turn the filling handles and watch the pressure rise on the gauge. When it reaches the right level, turn them back and switch the boiler back on. Unless you’re confident in what you’re doing, however, it’s recommended to contact a gas safe engineer. 

Lonsdale Plumbing provides boiler service to homeowners in Leicestershire, Derbyshire, and the East Midlands. We cover all aspects of plumbing and heating engineering. We always have the owner’s best interest at heart and strive to provide you with the right advice and the most cost-effective solution. If you need a boiler service or assistance with any boiler problems, get a free quote today.