Does it matter whether a thermal expansion tank (for water heaters) is installed above the pipe it tees from (tank's threaded port pointing downwards) or if it's installed below so that it hangs from it (tank's threaded port pointing upwards)?
Plumbing – Is the orientation of an expansion tank with respect to the pipe important
plumbing
Related Topic
- Plumbing – Can a thermal expansion tank be install above the water heater
- Plumbing – Replacing steel expansion tank with diaphragm expansion tank. Is location critical
- Plumbing – the Correct Hot Water Expansion Tank Pressure
- Plumbing – Did a pressure spike cause this valve body to crack in half
- Plumbing – Can the water supply pass through a water heater before the expansion tank
Best Answer
In general, the tank can be installed vertically above or below the plumbing, or horizontally. Typically, the tank is only required to be supported when installed in the horizontal position. Most smaller tanks are designed to be supported by the plumbing, when installed in the vertical orientation. The most common recommendation seems to be, to install the tank vertically below the plumbing.
You'll want to check the manufacturer's installation instructions, to determine how to properly install the specific tank you're using.
Here's example installation instructions, from a Watts® Potable Hot Water Expansion Tank.