Water Heater Expansion Tanks Explained
How much do you know about your water heater? If you answer “Not that much”, you’re not alone. Homeowners can’t be expected to have expert knowledge of their hot water and plumbing systems. After all, that’s why you have us, Best Choice Plumbers.
But we do think it’s important to have some understanding of various parts and components of your hot water system, such as the thermal expansion tank. Understanding the purpose of this component will give you a better sense of the workings of the water heater as well as when you may need to call for repairs.
What is a Water Heater Expansion Tank?
A water heater expansion tank is a cylindrical tank that is installed on the cold water supply line of your water heater. It consists of two compartments separated by a rubber diaphragm: one side is connected to the water supply, and the other side contains compressed air. The tank is designed to absorb the increased volume of water that occurs when water is heated and expands, thereby preventing excessive pressure build-up.
What Does a Water Heater Expansion Tank Do?
When water is heated, it expands. The expansion tank absorbs the excess pressure, protecting your water heater, pipes, and fixtures from potential damage.
By mitigating pressure build-up, the expansion tank helps prevent damage to the water heater, such as leaks, burst pipes, and reduced lifespan of the unit. It also helps prevent the dripping of water from the pressure relief valve, which can be a sign of over-pressurization.
Maintaining a stable pressure within the system helps ensure that the water heater and plumbing fixtures operate efficiently and reliably, reducing the risk of unexpected failures and costly repairs.
How to Know If Your Expansion Tank Needs to be Replaced
- Inspect the expansion tank regularly for signs of wear and tear, such as rust, corrosion, or water leaks. Any visible damage is an indicator that the tank may need to be replaced.
- If you notice fluctuating water pressure in your home, it could be a sign that the expansion tank is failing.
- Frequent issues with your water heater, such as the pressure relief valve discharging water, can indicate that the expansion tank is no longer effectively absorbing pressure.
- Expansion tanks typically have a lifespan of 5-10 years. If your tank is within or beyond this age range, it’s a good idea to have it inspected and possibly replaced to ensure continued protection for your water heating system.
If you notice any of the signs above, it could mean that your expansion tank is in need of replacement. Contact Best Choice Plumbers today for a hot water system inspection, and if needed, new expansion tank installation. Our team of experienced plumbers are here to ensure your entire plumbing system remains in good condition and operates smoothly for years to come.