I distinctly remember the day a customer called me in a panic because water was cascading down her staircase, flooding the new oak floors. It turned out her plumbing system had suddenly switched from open to closed, causing a pressure build-up that led to significant water damage.

What could’ve avoided it? An expansion tank. From that moment on, I knew that recommending an expansion tank with every water heater installation was a must.

Here’s why you should consider adding an expansion tank to your water heater system and how it can save you from unexpected headaches and costly repairs.

The Importance of an Expansion Tank

An expansion tank is like a safety net for your plumbing system. It steps in to handle the extra water volume that occurs when your water heater heats up. Without it, this extra volume can increase pressure in your pipes, potentially causing damage.

Open vs. Closed Plumbing Systems

One big reason we advocate for expansion tanks is that it’s tough to tell if your home has an open or closed plumbing system. An open system lets excess pressure flow back into the municipal water supply. A closed system, however, keeps all that pressure within your home’s plumbing, which can lead to problems.

Why Every Installation Should Include an Expansion Tank

Given how easily your home’s plumbing system can switch from open to closed, it’s smart to include an expansion tank with every water heater installation. This small addition can prevent unexpected water damage and save you from costly repairs.

Lifespan of Expansion Tanks

Expansion tanks usually last as long as water heaters. So, when you replace your water heater, it’s a good idea to replace the expansion tank too. This ensures everything works smoothly and keeps your plumbing system in great shape.

Is an expansion tank required in California?

Yes, California requires a thermal expansion tank or equivalent in water heating systems for closed systems. According to the Plumbing Code (Section 608.3) and Mechanical Code (Section 1005.0), these tanks are necessary to prevent pressure spikes and leaks by absorbing excess pressure when water heats up and expands. Additionally, they are mandated if your water heater is equipped with a pressure regulator or backflow preventer.

Do you need an expansion tank? Give us a call to schedule a plumbing inspection if you live in any of the following cities:

Final Thoughts

Installing an expansion tank with your water heater isn’t just a good idea—it’s essential. It’s a small investment that can prevent major damage and expenses. Whether you realize it or not, your plumbing system can change, and being prepared with an expansion tank is a wise choice.

If you have any questions or need help with your plumbing, give us a call. We’re here to offer expert advice and top-notch service, keeping your home safe and efficient.