Can A Water Heater Expansion Tank Be Installed Upside Down
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However, depending upon the brand of water heater, the conditions for warranty coverage may well demand that an expansion tank be installed. I have a Reliance Gas tank with 12 year warranty that requires an expansion tank or the warranty is void. An expansion tank is always highly recommended if you have a ‘closed-loop system’ caused by any kind of check valve or pressure regulating valve installed on your house’s water supply line. A common analogy compares having high water pressure in your home to having high blood pressure. The Handyguys review some basic maintenance for your expansion tank that should be included in a new home owners manual. Water Heater and Expansion Tank Maintenence. How To Adjust Hot Water. AsktheBuilder.com: Water heaters can be fitted with expansion tanks to capture expanded water and prevent water heater malfunction. Sizing water heater expansion tanks is easy for your hot water heater, and adding a hot water expansion tank can be done within 30 minutes. We recently had a hot water tank expansion tank installed on the cold pipe coming into the hot water heater. This expansion tank is mounted upside down, the print on the tank is upside down.
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- Water Heater Expansion Tank Sizing
- Water Heater Expansion Tank
- Water Heater Expansion Tank Installation
Can A Water Heater Expansion Tank Be Installed Upside Down Lyrics

A hot water expansion tank is a very important part of a water heater. When water is heated it expands and needs a place where it can safely overflow to. If there is no expansion tank, the pipes could begin to leak or burst. Installing a hot water expansion is job you can do yourself, with the right tools and this guide you will be able to successfully install your hot water expansion tank.
Step 1 – Shut off the Water Supply
The first step in installing a hot water expansion tank is to shut off the water supply to your heater. If you have a shut off valve located on the supply line for your water heater, close it or shut off the water from the main supply line to your home.
Step 2 – Turn off the Power Supply
If your water heater uses electricity, turn off the breaker that supplies electricity to your water heater.
Step 3 – Turn off the Gas
If your water heater uses gas to heat the water, you will need to turn off the gas supply to the heater. If you do not know how to turn off the gas supply, contact your gas company and seek assistance.
Step 4 – Size of the Expansion Tank
Decide on the size of the expansion tank you are going to buy, a good idea is to check the capacity of your water heater and buy the expansion tank. You can verify the right size at the hardware store.
Step 5 – Other Accessories
While you are at the hardware supply store, buy the Teflon tape and the tee fitting. You might also need to buy the mounting brackets and a couple of 1 ½ inch screws.
Step 6 – Cold Water Supply Line
Find the cold water line and check which one is horizontal to the hot water heater. This is the water supply line you will need to connect to your water heater.
Step 7 – Placing the Expansion Tank
Position the expansion tank above the cold water supply pipe. From there it should be assessable to the water heater.
Step 8 – Fix the Tank
Mark the place where the mounting brackets will go on the wall and drill holes. Fix the expansion tank on the wall.
Step 9 – Tee Fitting
Connect the tee fitting to the pipe that supplies cold water.
Step 10 – Connect the Tank
Wrap Teflon tape around the end of the connector of the expansion tank and fix it to the tee fitting. Tighten it with a wrench but make sure you do not over tighten it and break it.
Step 11 – Water and Power Supply
Turn on the water supply and switch on the breaker that supplies electricity to the heater. If you use gas for your water heater, reconnect the gas piping and turn on the gas.
Step 12 – Check the Expansion Tank
Once the tank is filled and the heater is on, open a faucet and check if hot water flows from the faucet.

I want to replace my water expansion tank and I just found out that it is installed in the hot water pipe coming out from the water heater. From what I've read, it should be installed in the cold water supply. I want to know if this will cause any problems
Tester101Water Heater Expansion Tank Sizing
2 Answers
The only 'problem' is that it fills with hot water. The water sits there and will get cold if not being used.
When the hot water is turned on again, this cooler water will mix with your hot water.
Your hot water will change in temperature a bit until the water in the tank, and the metal of the tank get hot.
Nothing will happen that will ruin your plumbing.
The hot water line is a normal-enough place to install one for hot water expansion (especially if there is a check valve on the line entering the hot water tank, for preventing thermo-siphoning.) It's not be the best choice from a hot water efficiency point of view, though (since the water in the expansion tank will tend to cool, and that means a slug of cold-ish water will come out before any hot water does.)
If using a tank for hot water expansion it can be on the cold feed line, but must be after any check valve. If there's no check valve, it can be anywhere on the cold side.
The cold water line is the typical place to have one for a well-pump pressure system, but that is presumably not the situation you have if the current tank is on the hot water side.
Be sure the tank you replace it with is designed to work with hot water; or move it to the cold side if that's not too inconvenient.
Ecnerwal