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Why Is a Water Heater Expansion Tank Important?

Let’s go back to elementary school for a moment. What does water do when it is heated? Correct – it expands! This is called thermal expansion. Now think about your tank-style water heater. It can hold only so many gallons of water as it heats up, so all that extra water has to go somewhere. A water heater expansion tank, designed to handle the thermal expansion of water, is the answer.

Follow along as we explain what an expansion tank is and how it helps maintain a safe and efficient home water system.

What is a Water Heater Expansion Tank?

A water heater expansion tank is a small tank that is installed near your water heater. It consists of two compartments separated by a bladder or diaphragm: one side is connected to the water supply, and the other side contains air. As water heats up and expands, the increased volume causes pressure to build up in the system. The expansion tank absorbs this excess pressure, preventing potential damage to the plumbing system.

Why is a Water Heater Expansion Tank Important?

1. Pressure Regulation

When water is heated, it expands and increases the pressure within the plumbing system. Without an expansion tank, this pressure can cause stress on pipes, joints, and fixtures, leading to leaks or even bursts. The expansion tank provides a space for the excess water to go, regulating the pressure and keeping it within safe limits.

2. Preventing Water Hammer

Water hammer is a phenomenon where sudden changes in water flow create a loud banging noise in the pipes. This can be caused by the rapid expansion and contraction of water within the system. An expansion tank helps to mitigate this issue by absorbing the sudden pressure changes, thus preventing the noisy and potentially damaging effects of water hammer.

3. Prolonging Water Heater Lifespan

Excessive pressure within the water heater can accelerate wear and tear on its components, potentially leading to premature failure. By managing pressure fluctuations, an expansion tank helps to protect the water heater, extending its lifespan and ensuring it operates efficiently for longer.

When to Call a Professional

If you notice water leaking from the expansion tank, frequent fluctuations in water pressure, water hammer noises, or if you expansion tank is between  5 and 10 years old, it’s a good idea to have it inspected by a professional and consider replacing it if necessary. And that’s where we come in.

At Messmer Mechanical, we service, repair, and install all makes and models of water heater so you can enjoy the steady supply of hot water you depend on. Contact us today.