Your boiler is an integral part of your central heating system. It heats the water inside the tank that supplies either steam or hot water (most modern systems are hot water heating systems. Older homes usually have steam heating systems), which flows through the pipes and radiators.
Boiler pressure is the pressure of hot water running in your central heating system. Your boiler must be at the right pressure for your heating system to work properly. Usually, the ideal boiler pressure is between 1-1.5 bars (when your central heating is not working) and 1-2 bars (when your boiler is heating up).
Boilers have a boiler pressure gauge (usually located on the front of the boiler or behind the control panel) that displays boiler pressure. On older systems, the boiler pressure gauge is usually located underneath as part of the pipework. Boiler pressure dials indicate low and high boiler pressure with red and green color-coded markers. Safe levels of boiler pressure are marked in green.
It is normal for boiler pressure to rise when the boiler is hot and falls as it cools down (water expands when heated and contracts when cooled). However, an abnormal rise or drop in boiler pressure could indicate a problem with your boiler.
If your boiler pressure is too low, your system won’t be able to heat water properly or, worse, won’t heat your water at all. If, on the other hand, your boiler pressure is too high, your system may fail.
Sometimes, a boiler gradually loses pressure over time. You know you have low boiler pressure when it drops below one bar. Two common causes of low boiler pressure are water leaks and bleeding radiators.
A leak in your pipe boiler or radiators could be hard to spot. Look around for signs of leaks such as damp patches and drips of water around the base of the boiler. Damp patches along the pipework could indicate problems with your pipework. Do not try to look inside your boiler. If you are unable to diagnose the problem, reach out to an expert for help.
If you just bled your radiators, you may notice a drop in your boiler pressure. Bleeding the radiators will remove air in your boiler, causing your boiler pressure to drop.
Follow these steps to increase your boiler pressure.
If your boiler pressure drops more than twice a year, check your pipes for signs of leaks. Green deposits near joints in copper pipework or stains on the ceilings or skirting boards could indicate a problem. If you find a water leak or your boiler pressure keeps dropping significantly, schedule a boiler inspection.
If your boiler pressure gauge reads 2.5 bar or over, you have high boiler pressure. There are several reasons why boiler pressure increases. You could have accidentally put more water in your system than recommended or left the filling valves open, or not screwed them tight enough.
Here are steps to decreasing boiler pressure
If your boiler pressure keeps rising abnormally, have your contractor inspect your boiler.
John Owens Services Inc. offers top-notch VAC repair services near Novato. Our heating and cooling experts know everything there is to know about HVAC systems. We will help you select the right HVAC system size for your home as per your heating and cooling requirements. To schedule an inspection, call 707-207-8592.
Our philosophy is simple, we always want to maintain equipment to give it the longest life possible. Next, we want to focus on repairing when something goes wrong. Then only as the last choice, we replace equipment when needed. That’s the John Owens Way.