Expansion Tank and how they installled

An expansion tank is a device that is used in conjunction with a hot water tank to control pressure fluctuations in domestic water distribution systems, in this case inside your property. The idea is simple, as water gets hot its molecules expand and as it cools water molecules compress. Let's get to the bottom of it.

A residential property has what’s called a closed plumbing system and such system can create dangerous high water pressures. Therefore, when such dangerous pressures exist, a expansion tank can actually help absorb them. A pressure tank is simply a metal tank with a rubber bladder inside of it that uses air as a cushion. Think of it as a pillow. When you rest your head on it you are creating a pressure and the pillow is happy to compress and make you feel good. Well, that's the whole point of an expansion tank because it likes to help your water pressure system stay controlled. 

How they should be installed?
For general knowledge an pressure tank holds about two gallons in a residential system but the size can also vary depending on the actual volume of the hot water tank they serve. Pressure tanks have labeling on them that specify the design pressure for which they were built, usually around 150 pounds per square inch (PSI) for residential use. A home inspector will generally inspect that they are properly supported specially if they are installed horizontally. Horizontal installations require proper strapping and bracing. With that being said, a home inspector will also look to see if the expansion tank is installed well above the hot water tank to ensure that water will easily flow back down in the direction of gravity. Another well known aspect to be checked are for any signs of corrosion. A corroded tank will lead to leaking and loose efficiency, so make sure you have a professional help you to either replace it or fix before something more serious can happen. Additionally, the best way to install them would be to position them in a downward direction just as shown on the above picture.

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