If you’ve recently looked at your water heater, you might have noticed a small, basketball-sized tank sitting on the pipes above it. That is an expansion tank. While it might look like an optional add-on, it plays a critical role in protecting your home’s plumbing from the “hidden” dangers of thermal expansion.

At Davis Plumbing, we receive many calls from 951 homeowners wondering if these tanks are necessary. Here is why they are a vital part of a modern septic system design and home plumbing setup.

The Science of Thermal Expansion

When water is heated, it expands. In the old days, that extra volume of water would just push back into the city’s main water supply. However, most modern homes in Riverside County now have “closed-loop” systems with check valves. This means the expanding water has nowhere to go. This creates a massive spike in pressure that can stress your pipes, toilets, and the water heater itself.

How the Expansion Tank Protects You

The expansion tank acts as a “safety lung” for your plumbing. It is divided by a rubber diaphragm with air on one side and water on the other. When your water heats up and expands, it flows into the tank, compressing the air instead of putting pressure on your pipes. This prevents:

  • Leaking Faucets: High pressure often causes constant drips.
  • Premature Tank Failure: Constant pressure spikes can weaken the inner lining of your water heater.
  • Burst Pipes: In extreme cases, thermal expansion can cause a pipe to fail at its weakest point.

Is It Required in the 951?

In many cities within Riverside County, building codes now require an expansion tank whenever a new water heater is installed. Even if it’s not required in your specific area, we highly recommend it to extend the life of your plumbing system.

Professional Plumbing Protection

Not sure if your home has a closed-loop system or if your expansion tank is working correctly? Davis Plumbing offers comprehensive septic tank inspection and plumbing safety checks throughout the Inland Empire. We’ll ensure your home is up to code and protected from pressure damage.

Call Davis Plumbing at (951) 657-0393 to speak with an expert today.