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What Does High Pressure Have to Do With Boiler Repair?

Boilers are part of a hydronic heating system. A hydronic system uses either hot water or steam to heat your home. Your boiler needs to operate with a certain level of pressure in the system, but too much pressure can cause problems. We’ll explain more in detail below, but when it comes to heating repairs, there’s only one company to call: At Your Service Plumbing, Heating & Air. We have been helping customers with heating repair since 1980, and our NATE-certified technicians are available 24 hours a day, 7 days a week.

High and Low Pressure Boilers

When it comes to pressure, there are two types of boilers: high and low. Low pressure boilers are the ones used to heat buildings; high pressure boilers are used to generate steam for power. Examples of where a high pressure boiler is used would be Laundromats, dry cleaners and power plants. As such, the issues we’ll be discussing here pertain to low pressure boilers.

Reasons the Pressure May Rise

The normal pressure range for a boiler shouldn’t exceed 15 psi (pounds per square inch). If it does, it’s best to call for a technician. Here are some reasons why high pressure can develop in a boiler:

  • Problems with the expansion vessel – the expansion vessel helps regulate the pressure in your system. If it malfunctions, it can cause the pressure in your system to rise.
  • Problems with the expansion tank – the expansion tank is needed to accommodate for the expanding water levels in your system as the water is heated. Problems with the expansion tank, such as a clogged water pipe, the combination of too much water/too little air in the tank, or a defective tank, can all cause pressure to rise.
  • Trapped air in the system – pockets of air in your system, sometimes referred to as “air lock”, can sometimes cause the pressure to rise in your system.

The balance of correct pressurization in your boiler is critical to proper operation. As such, only a trained professional should work on any pressure problem with your heating system. Experiencing heating problems? Call At Your Service Plumbing, Heating & Air and schedule heating repair service in Salt Lake City with us today.


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