Summary:
Mr. Rooter Plumbing® goes into detail about what an expansion tank is and the situations in which you might need to install one.
- A water heater expansion tank absorbs pressure from heated water, preventing plumbing damage.
- It’s especially important in closed plumbing systems where water can't flow back into the main supply.
- Signs you may need one include dripping faucets, pressure changes, or noisy pipes.
- Expansion tank size depends on your water heater capacity, pressure, and temperature.
Mr. Rooter Plumbing® offers expert installation, repair, and advice on expansion tanks. When researching the best water heater for your property, you may have discovered the importance of a water heater expansion tank. Rather than simply installing a water heater to manage your heated water supply on its own, you often need to install a thermal expansion tank next to it or on top of it.
What does an expansion tank do, and why is it so important? Learn the answers to your pressing questions below!
What Is a Hot Water Expansion Tank?
A water heater expansion tank is a small tank that’s connected to your water heater’s plumbing system. It’s designed to absorb the increased volume of water that results from thermal expansion when water is heated.
The expansion tank prevents excessive pressure buildup, which protects your water heater and plumbing system from damage. To do this job, it has a small rubber bladder that’s partially filled with air. The air in the bladder absorbs the pressure of the expanding water.
Alongside preventing buildup, a water heater reservoir tank provides other benefits, such as:
- Extending the life of your plumbing system parts
- Preventing stagnant water
- Enhancing the main water heater’s efficiency
- Protecting water heater health
Do I Need a Water Heater Expansion Tank?
If you’ve never seen a water heater or boiler expansion tank before, learning about how important they are can be confusing! These tanks are often required for new water heater installations, particularly in closed plumbing systems. If you have an older water heater, you may not have or need one.
What Is a Closed Plumbing System?
A closed plumbing system is a form of plumbing setup in which the water flows in a loop under pressure and can’t flow back into the main water supply. There are backflow preventers or check valves in place to let the water in, but not back out again. These systems have been designed to prevent contamination of the public water supply while also maintaining a consistent water pressure for the property occupants’ convenience.
Clues It’s Time to Add a Water Heater Expansion Tank
While water heater expansion tanks are a standard part of closed plumbing systems, you may also need to install one if you have an older water heater. Look for these signs:
- Faucet drips and leaks
- Water pressure fluctuations
- Mineral deposits around pipe fittings
- Loud noises
These signs can mean your plumbing system is under stress, or there’s pressure in your pipes that needs to be regularly released.
Choosing the Right Water Heater Expansion Tank Size
If you believe you need to install a water heater reservoir tank to take the pressure off your water heater, you’ll need to ensure it’s the most appropriate size to suit your water heater.
While most water heater expansion tanks are 2-5 gallons, your water heater tank specifications determine its exact size. Follow these steps below:
- Read the sticker on your water heater to learn its size
- Test your home’s water pressure with a water pressure gauge
- Check the temperature of the water from your cold and hot faucets with a thermometer
- Input the information into an online expansion tank size calculator
Alternatively, contact a local trusted plumber who can advise you of the best water heater expansion tank for your needs and assist with installation.
Comprehensive Water Heater Services, Including Expansion Tank Installation
Don’t put your water heater at risk of pressure buildup and failure any longer. Talk to the expert team at Mr. Rooter Plumbing® about installing a new water heater expansion tank. Our licensed and insured plumbers can assist with new installations, replacements, repairs, and maintenance. Request a job estimate online or call us 24/7.
