A thermal expansion tank plays a critical role in protecting your plumbing system. But like any plumbing component, it does not last forever. If your expansion tank has failed or is no longer working properly, it can put stress on your water heater, pipes, and fixtures.
At Roto-Rooter, our plumbers regularly inspect and replace thermal expansion tanks as part of water heater service and pressure troubleshooting. If you are experiencing plumbing issues, a failing expansion tank could be the cause.
What a Thermal Expansion Tank Does
When water heats up, it expands. In a closed plumbing system, that extra volume has nowhere to go. A thermal expansion tank absorbs the increased pressure created during the heating cycle.
Inside the tank is a rubber bladder that separates water from compressed air. As heated water expands, it pushes into the tank and compresses the air. This prevents dangerous pressure spikes inside your pipes.
Without a properly functioning expansion tank, pressure builds every time your water heater runs.
Why You Might Need a New Expansion Tank
Thermal expansion tanks typically last between five and ten years. Over time, internal components wear out and stop working as designed. Our plumbers often find failed tanks during routine inspections.
Here are the most common reasons you may need a new one.
The Internal Bladder Has Failed
If the bladder ruptures, the tank fills completely with water. Once this happens, the tank can no longer absorb expansion. It becomes useless and must be replaced by a licensed plumber.
You Notice Water Pressure Spikes
High pressure can cause faucets to drip, toilets to run, or your temperature and pressure relief valve to discharge water. These are warning signs that your expansion tank may not be doing its job.
The Tank Is Waterlogged
A plumber can test your expansion tank by tapping it or checking air pressure at the valve. If the tank is fully waterlogged or has lost its air charge, replacement is often the best solution.
You Recently Replaced Your Water Heater
If a new water heater was installed but the expansion tank was not replaced, it may already be worn out. Installing a new heater with an old tank can lead to premature plumbing issues.
Signs of a Failing Thermal Expansion Tank
Watch for these warning signs:
- Dripping from the temperature and pressure relief valve
- Fluctuating water pressure
- Banging or knocking pipes
- Visible corrosion on the tank
- Water heater leaking prematurely
If you notice any of these issues, call a professional plumber to inspect your system.
If you need professional Water Heater Repair in Sacramento, Water Heater Repair in Desert Hot Springs, or Water Heater Repair in Escondido, Roto-Rooter has licensed plumbers ready to help. Our experienced plumbers diagnose pressure problems, failing expansion tanks, leaking water heaters, and inconsistent hot water quickly and accurately. Whether your system is experiencing high pressure from a faulty thermal expansion tank or your water heater is showing signs of wear, our plumbers provide fast, reliable service to restore performance and protect your plumbing system.
How a Plumber Replaces an Expansion Tank
Replacing a thermal expansion tank requires proper sizing and pressure adjustment. Roto-Rooter plumbers will:
- Check your home’s water pressure.
- Confirm the plumbing system is closed.
- Select the correct tank size for your water heater.
- Precharge the tank to match your water pressure.
- Install and secure the new expansion tank properly.
Improper installation can lead to continued pressure problems. That is why it is important to have experienced plumbers handle the job.
Do Not Ignore a Failed Expansion Tank
A failed expansion tank can shorten the life of your water heater and damage plumbing components throughout your home. Replacing it is far less expensive than repairing burst pipes or a failed water heater.
If you suspect your thermal expansion tank needs replacement, contact Roto-Rooter today. Our licensed plumbers provide fast, reliable service to protect your plumbing system and restore proper pressure control in your home.