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Solar Expansion Tanks

Frequently Asked Questions

Check out our great FAQs and Answers for our Solar Expansion Tanks below:

What Is The Purpose Of A Solar Hot Water Expansion Tank?
An expansion tank in a Solar Hot Water System acts as a safety buffer for the heat transfer fluid in the system.  As the pressurized system heats up, the heat transfer fluid/water mixture expands and creates a higher pressure in the system.  When this happens, the expansion tank takes on the excess pressure to prevent any damage to the pipes.

What Size Of An Expansion Tank Do I Need?
The size of your expansion tank is dependent on the size of your Solar Hot Water System, how much heat transfer fluid will be in your system, and the pressure of the entire system.  Depending on these factors, we will help you decide which size will be right for your system.

Category How-To Guides

Check out our great DIY and How-To Guides for our Solar Expansion Tanks below:

How To Install An Expansion Tank

How To Tell If Your Expansion Tank Is Working:

An expansion tank is divided into two sections (top and bottom).  The top portion of an expansion tank is filled with the heat transfer fluid/water mixture, and the bottom is filled with air at a specific pressure.  There are two main ways to tell if your expansion tank is working: sound and feel.  Knock on the top and bottom portions of the tank separately, and listen for two different sounds.  The top should sound like a dull thud while the bottom should sound hollow.  If the two sounds are exactly the same, then you might need to repair or replace your expansion tank.  The top and bottom should also have different temperatures; the top should always be warmer than the bottom.  If this is not the case, you might need to repair or replace the tank.

Category Learning Guide

Check out our great Information & Learning Guides for our Solar Expansion Tanks below:

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How A Thermal Expansion Tank Works:

Additional & Related Resources

Check out our great Documents & Additional Resources for our Solar Expansion Tanks below:

  1. Fitting Set for Solar 16 G Expansion Tank
  2. Solar Expansion Tank – 2 Gallon
  3. Solar Expansion Tank – 4.4 Gallon
  4. 221006 EXPANSION TANK 4.7 GAL
  5. Solar Expansion Tank 6 – Gallon
  6. XMaxx Expansion Tank Bracket Kit with 1/2 in Svc Conn
  7. 221007 EXPANSION TANK 6.6 GAL
  8. XMaxx Expansion Tank Bracket Kit with 3/4 Svc Conn
  9. Solar Expansion Tank with Connections 6 Gallon
  10. Solar Expansion Tank 16 Gallon
  11. Solar Expansion Tank with Connections 16 Gallon
  12. 221008 EXPANSION TANK 9.2 GAL
  13. 14G Expansion Tank
  14. 7.6G Expansion Tank
  15. Solar Expansion tank – 53G
  16. Solar Expansion Tank – 26G
  17. Solar Expansion Tank – 32 Gallon
Solar Expansion Tanks

A solid, reliable solar expansion tank is a critical component of any pressurized solar hot water or solar heating system. The solar expansion tank provides a safety buffer as the heat transfer fluid (typically a combination of water and SunMaxx Glycol XT) expands as temperatures within the solar loop of your solar thermal system increase throughout the day.

If you have any questions in choosing the right size solar expansion tank for your new solar hot water system, or to replace an aging expansion tank in your existing system, please contact one of our solar professionals today.

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Silicon Solar
2917 State Hwy 7
Bainbridge, NY 13733
P: 1.800.786.0329


Why Shop With Us

Why Shop With Silicon Solar

Silicon Solar is, and always will be, a family owned and operated solar company dedicated to providing the highest quality solar powered products which have completed our rigorous quality inspection. We also manufacture a full line of solar powered products right here in our production facility; enabling us offer faster delivery and priority technical support.

Search our online catalog for hundreds of solar lights, solar fountains and many other products, including solar cells and solar panels. We also manufacture custom solar kits upon request for professors and educational programs.

Call us today for your solar request, 1.800.786.0329

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Help us fight SPAM:
What is the SUM of 7+4?

Contact Silicon Solar

Silicon Solar
2917 St Hwy 7
Bainbridge, NY 13733

P: 1.800.786.0329

Contact Silicon Solar