hydronic tanks

The Core of Boiler System Protection

Boiler systems heat a fluid and pump it through a closed loop of pipes to radiators, baseboard heaters or in-floor radiant tubing, increasing the temperature in a space. When a liquid is heated, it expands in volume, resulting in a rapid increase in pressure.

A hydronic heating system expansion tank is built to relieve the excess pressure from the system. It features a heavy-duty bladder or diaphragm that separates the system's heating fluid from a captive cushion of air. This design allows it to store the excess volume and release it when the system cools down, protecting other components from leaks and damage.

Selecting the Right Hydronic Expansion Tank for Your Boiler

A hydronic expansion tank is a critical part of a dynamic heating system design. Consider the characteristics of your boiler system to choose the right size and model. Most manufacturers offer sizing tools and mobile apps that run complex calculations to find a match.

At Midwest Supply, we are dedicated to streamlining your purchase process. Our experts are available to provide online technical support, walk you through your options and find a tailored solution for your boiler system.

Some of the most important things to keep in mind when comparing commercial hydronic expansion tanks include:

Total System Volume

The total system volume is measured in gallons and comprises the total amount of fluid contained in the boiler, pipes and heat emitters. This volume is one of the most crucial factors in determining the size of your hydronic tank. The less fluid in the system, the less it will expand, so you can use a smaller tank.

Fluid Type

Hydronic expansion tanks are only used for non-potable water and fluid systems. Some boilers use a mixture of water and glycol, also known as antifreeze. Knowing the type of fluid your system uses is essential because glycol expands at a significantly higher rate than plain water, requiring a larger tank size.

System Temperature Range

The temperature range of your system is the difference between the coldest temperature and its maximum operating temperature. Higher temperature swings result in greater fluid expansions, which need large expansion tanks to ensure safe operations.

System Pressure Range

The maximum and minimum pressure of your boiler will determine how efficiently the tank can absorb the expanded fluid. The lower pressure occurs when the system is cold, while the highest pressure is set by the boiler's pressure relief valve.

Find a Full Range of Hydronic Expansion Tanks for Sale

Midwest Supply is the professional's source for high-quality, durable hydronic expansion tanks. Browse our inventory now to find the right expansion tank to ensure the stability and longevity of your hydronic system.