As the temperature increases inside a water heater, the thermal change produces extra pressure inside the tank. Traditionally, plumbing systems have been designed to direct this additional pressure back into the municipal water supply line. However, with more communities adopting the use of closed-loop systems, many homeowners are discovering that they need to invest in a thermal expansion tank to prevent pressure problems. If you’re facing this issue, here’s what you should know about thermal expansion tanks and how they can prevent the need for plumbing repairs.  

How Does a Thermal Expansion Tank Work?

Thermal expansion tanks come in a variety of sizes, but generally, look similar to a propane tank. They are attached directly to the side or top of the water heater. One half of the tank contains compressed air, while the other half contains water from your household supply line. A rubber bladder sits between the air and water.

When the water heater temperature increases, the liquid inside the system will expand and be directed toward the expansion tank. As the liquid enters the tank, the bladder will press against the pocket of compressed air to create more room for the liquid. As a result, the pressure will remain stable.

What Are the Benefits of an Expansion Tank?

If your home’s water supply line is outfitted with a check valve or pressure regulating valve, you have a closed-loop system. Without an expansion tank, your home’s plumbing system will be subject to water pressure fluctuations.

While these fluctuations won’t cause noticeable problems right away, it could lead to severe issues that limit the performance of your plumbing system. Specifically, sudden pressure changes may lead to water hammer—a problem that occurs when water suddenly changes direction inside the pipes. In addition to periodic clanking noises, this force can cause considerable damage to pipes that may result in dangerous ruptures and leaks. Since an expansion tank helps mitigate this extra pressure, it can prevent water hammer and the plumbing repairs it may cause.

When your water heater is putting too much pressure on your pipes, turn to the professionals at Do It Right Plumbing Sewer & Drain Services in Eagan, MN. Serving home and business owners throughout Dakota County, these licensed and insured plumbers are equipped to install and repair thermal expansion tanks, as well as set-up new water heater systems. They can also reliably restore leaks and other problems caused by water hammer. To learn more about their emergency plumbing repairs and routine maintenance services, visit them online. If you’d like to request emergency service or schedule an estimate, call (612) 388-8524.