thermal tanks

Why Thermal Expansion Tanks Matter

When water is heated, it expands. In a closed environment like your water heater and plumbing system, this results in a pressure spike. A thermal expansion tank works by absorbing extra water volume to ensure safe and stable pressure levels, protecting components from damage, leaks, and ruptures.

Thermal tanks are equipped with a flexible bladder or diaphragm that separates a pocket of compressed air from the system. As water heats and expands, the excess pushes into the tank, compressing the air within it. When the hot water stream is used, the air pressure pushes the extra volume back into the system.

Some of the benefits of choosing a quality expansion tank include:

• Protect plumbing and appliances from excessive pressure buildup
• Extend system lifespan and reduce costs on replacements
• Improved system efficiency and operational safety

Selecting the Right Expansion Tank for Your Water Heater

You must consider several factors before choosing a thermal expansion tank to create a balanced system. Proper sizing and pressure rating will ensure the tank is nearly empty when the water is cold, providing the right capacity when the water heater is in use. This allows for stable and safe system pressure at all times.

Some important things to have in mind when shopping for expansion tanks include:

Match Tank Size to Water Heater Capacity

The volume of the water heater will determine the size of the expansion tank you need. The larger the volume of your water heater, the more it will expand, requiring a large expansion tank to safely absorb pressure. You should size your tank to the volume of expanded water. Everflow thermal expansion tanks provide sizing charts on their specs, measured in gallons.

Verify Water System Pressure

A thermal tank works by balancing two pressures — the pressure in your system on one side of a rubber bladder and the pressure of a cushion of air on the other side. Matching the static pressure of your system with the tank measurements will allow it to work at full capacity and protect your heater.

Choose a Certified, Trusted Brand

At Midwest Supply, we have over 50,000 in-stock products from industry-leading manufacturers available for fast shipping. Your thermal tank should meet all local plumbing codes and be certified for potable water systems. Choosing a trusted brand ensures you receive a durable and compliant component made from high-quality materials, delivering top performance.

Buy Thermal Expansion Tanks Online with Confidence

Midwest Supply is your premier partner for quality thermal expansion tanks. Browse our high-quality thermal expansion tanks or contact our team online for support in finding the right model and size for your water system.