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Pressure Tanks

A. O. Smith offers two types of pressure tanks: expansion tanks and pump tanks. Expansion tanks protect water heaters and plumbing systems from damage caused by water expansion while our pump tanks protect and extend the lifespan of well pumps by reducing their on/off cycling.

Expansion Tanks

Expansion Tanks

Storage & Pump Tanks

Pump Tanks

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Potable Water / Hydronic Expansion Tank Sizing

Use this sizing tool to calculate the proper expansion tank to meet your requirements.

Visit the Sizing Calculator
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Find Replacement Parts

Find replacement parts for your water heater.

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Product Documents, Images, & Videos

Get access to the latest product literature documents, images & videos.

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Check Warranty Status

Check the status of the product warranty.

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Water Heater Resources

Interactive tools, product manuals, warranty information, and more.

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Not sure which water heater is right for you?

Use our Buyer’s Guide to choose the correct model for your family’s home.

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For more than 40 years, Reliance Water Heaters has been committed to delivering dependable water heaters. Order from a trusted retailer near you.