How To Replace Water Heater Expansion Tank

How to Replace Your Water Heater Expansion Tank

You may save a significant amount of money and time by replacing your water heater expansion tank on your own. This tutorial will walk you through the process of replacing the expansion tank on your hot water heater without the need to hire a professional plumber. Simply follow the instructions outlined below to replace your water heater expansion tank in a safe manner.

Step 1 – Identify Your Old Expansion Tank

The first step in replacing the water heater expansion tank is to identify where it is located on the water heater. Most of the time, the tank is positioned immediately next to your water heater and is directly linked to the water heater. Once the problem has been detected, make a note of the dimensions and connections to guarantee that when you purchase a replacement, it will fit and function properly. New water heater expansion tanks can be purchased at a local hardware supply store or ordered on the internet.

Step 2 – Turn Everything Off

The first step in replacing the water heater expansion tank is to identify where it is located on the water heater. Most of the time, the tank is positioned immediately next to your water heater and is directly linked to the water heater. Once the problem has been detected, make a note of the dimensions and connections to guarantee that when you purchase a replacement, it will fit and function properly. New water heater expansion tanks can be purchased at a local hardware supply store or ordered on the internet.

Step 3 – Drain the Water

Drain the water from the water heater to lessen the pressure of the water coming out. By opening the bleeder valve, you will be able to drain the water. Fill the bucket with water and set it aside. Because the water may be pressured, use caution when using it.

Step 4 – Disconnect the Expansion Tank

Carefully disconnect the expansion tank from the rest of the system, taking care not to damage any of the pipes or fittings in the process of doing so.

Step 5 – Pressurize the Expansion Tank

Check the pressure reading in the tank when the water supply is switched off. It should read “0.” To fill the tank, use a bicycle tire pump and attach it to the Schrader valve, which is located at the bottom of the tank. Air should be added to the tank until it reaches 12 psi, or according to the amount specified on the manufacturer’s instructions.

Step 6 – Check the Pressure

Check the pressure reading in the tank when the water supply is switched off. It should read “0.” To fill the tank, use a bicycle tire pump and attach it to the Schrader valve, which is located at the bottom of the tank. Air should be added to the tank until it reaches 12 psi, or according to the amount specified on the manufacturer’s instructions.

Step 7 – Teflon Tape

Make use of the Teflon tape and wrap it around the ends of the connections to secure them. Do not start wrapping the Teflon tape around the connector threads from the beginning; instead, leave the first two or three threads uncovered, or your tape will get into the system.

Step 8 – Install the New Tank

Placing the new tank in the same location as the old one is essential. Connect the new tank to your heater system with caution. Check to see that the connectors are securely fastened.

Step 9 – Check the System

It is now possible to turn on the water supply.

To make sure that there are no leaks, check all of the connectors.

Step 10 – Open a Faucet

Open a faucet and let the water to circulate through the water heater system for a few minutes. Check for leaks once again to make sure there aren’t any.

Step 11 – Switch on the Power Supply

Turn on the water heater system’s power supply first, and then turn on the water heater itself, allowing it to come to temperature.

Step 12 – Hot Water

Once the system has reached operating temperature, perform one final inspection. Check the hot water faucet to see whether the water flowing is hot by opening it and checking it again.

Installing a Water Heater Expansion Tank

When used in conjunction with a pressure-limiting valve or a back-flow preventer, a water heater expansion tank serves as a safety measure to safeguard pipes and fixtures in plumbing systems. In certain cases, constructing an expansion tank is required by local building codes when installing a new water heater, while in other cases, it is a retrofit project that is carried out in order to provide additional protection to an existing water heater. An expansion chamber for accepting water that expands in volume as it is heated will be installed in a small air-filled tank above the water heater, and a splice will be made into the cold water supply pipe above the water heater to complete this project.

DIYers who are just starting out may find it useful.

How an Expansion Tank Works

It is possible that an expansion tank will be necessary in some cases, and it will help your water heater survive longer. Due to the thermal expansion of water as it heats up, a closed plumbing system that does not include an expansion tank linked to the water heater may suffer damage as a result of this expansion. The volume of water grows by roughly 2 percent when it is heated from a temperature of 50 to 120 degrees Fahrenheit. As the water heater tank fills with more and more water, it puts less pressure on the pipes and fixtures, lowering pressure on the water heater tank.

An expansion tank is comprised of a

An Expansion Tank May Be Mandatory

Because water heater installation normally necessitates the use of a plumbing permit, you will learn about any expansion tank requirements when you submit an application for a permit to install the water heater. If the system does not contain some form of pressure-limiting or back-flow valve that maintains the system closed, an expansion tank is typically not necessary. Although it is not necessary by local code, if your system does include some form of limiting valve, it is a good idea to add an expansion tank, even if it is not required by the code.


The installation detailed here makes use of existing copper tubing and follows typical installation guidelines.

Your installation will be different based on the size of the pipes in your circumstance and other considerations; if you’re unsure about how to continue at any time, consult with an expert for assistance.

Tools and Supplies You Will Need

  • Temperature expansion tank
  • Dielectric water heater union
  • Pipe wrench or channel-lock pliers
  • (2) 3/4-inch copper female-threaded unions
  • Pipe-sealing tape
  • 3/4-inch copper pipe
  • Additional 1/4″ copper fittings (as needed)
  • Thermal expansion tank
  • Dielectric water heater union Equipment for soldering copper flex pipes (if required)
  • Plumbing soldering equipment (if required)

Instructions (New Water Heater Installation)

When installing an expansion tank, it is often done directly above the water heater by means of a tee-fitting that is inserted in the cold water supply pipe of the system. It is customary to place the expansion tank vertically, yet it is allowed to put it horizontally if it is necessary due to space constraints. The plumbing fittings you’ll need may vary depending on the sort of plumbing pipes you have and how the expansion tank is positioned, but copper pipes and fittings are the most often used materials for the connections in this situation.

Attach a Dielectric Union

  • Installing a dielectric union at the cold water entry port of the water heater once it has been properly positioned is the next step. With pipe sealing tape wrapped over the union’s threads, insert the union into the cold water intake port on the water heater with a pipe wrench or channel-lock pliers

Attach Copper Adapter

  • After wrapping several loops of pipe-sealing tape over the top threads of the union, attach the union to the pipe with a female threaded copper adaptor. Using a pipe wrench or channel-lock pliers, tighten the joint firmly.

Attach Tee Fitting

  • Install a short piece of copper pipe and a tee-fitting on the water heater’s dielectric union to connect it to the adapter on the water heater. In order to give adequate space for the expansion tank, the tee-fitting should be approximately one foot above the water heater. The majority of plumbers use sweat-soldering to construct these connections, although they may also be made with push-fit connections (sometimes known as “shark-bite” connections).
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Attach Expansion Tank Pipe

Make an attachment to the side outlet of the tee-fitting with a short piece of horizontal copper pipe attached using sweat-soldering or push-fit connectors. However, depending on the amount of available space, it is advisable to make this copper pipe as short as possible—no more than 6 inches or so in length is recommended. Attach a female threaded adapter to the end of the horizontal pipe via sweat-soldering or a push-fit connection at the other end of the horizontal pipe.


  • When working with brass fittings and nipples, it is preferable to do so whenever feasible. Metals such as brass and copper are more effective in supporting the weight of the expansion tank. When supporting pipes from a beam, it is usually preferable to use a clevis hanger to secure the pipes.

Attach the Expansion Tank

Threaded fitting on the expansion tank: Wrap pipe-sealing tape around the threaded fitting on the expansion tank and screw it into the threaded adapter on the horizontal pipe. In most cases, hand tightening is adequate; nevertheless, extreme caution should be exercised to avoid damaging the pipes or fittings by overtightening.


  • Consider putting an additional valve before to the expansion tank, which will allow you to isolate the tank from the rest of the system in the event that it has to be replaced.

Complete the Installation

  1. Using whatever pipes and fittings are necessary, complete the installation by connecting the top outlet of the tee-fitting to the cold water supply pipe. Instead of using rigid pipes, many plumbers choose to use a copper flex line to create this connection. Likewise, finish connecting the hot-water pipes to the water heater, and then switch on the water heater, open the water valves, and test the functioning while checking for leaks.

Variations for an Existing Water Heater

When installing an expansion tank in an existing water heater, the most difficult part is figuring out where to put it. Space might become limited, and you may find yourself utilizing a variety of pipes and fittings to make place for the expansion tank. The copper flex line will often be replaced with a shorter or longer version, and extra elbows and pipes will be added to the cold water pipe as needed. In some cases, it may be required to put the expansion tank a foot or two further from the water heater, provided that it is correctly spliced into the cold water supply line.

7 Easy Steps to Install Water Heater Expansion Tank

You should install a water expansion tank in your building now that you have determined the proper size for your system’s water expansion tank. Fortunately, no specific talents are required for this procedure. To execute this activity, you will just require this tutorial and a few simple tools. You will need to purchase the tank first, though, which will require you to go to a store. A small device may be purchased for as little as $40, but bigger units might cost several hundred dollars. If you want to use the item in conjunction with a 40- to 50-gallon heater, select a 2-gallon type.

For the expansion tank, you can use a 3/4-threaded connection to secure it. You will need to install a tee fitting above your water heater in order to get a proper fit. Here are the procedures to take in order to get everything set up.

How to Install Water Heater Expansion Tank

Your water heater’s water supply should be turned off. If your unit is permanently connected to a water supply line that has a shut-off valve, turn off the water flow from the supply line to your building. If your devices are powered by electricity, turn off the circuit breaker. If your water heater is powered by gas, turn off the gas supply. However, if you are unsure about how to complete this procedure, you should contact your local gas supplier for assistance.

Step 2: Bring Out Expansion Tank and Accessories

Seek for an expansion tank that will be a good fit for your unit. This may be accomplished by taking note of the heater’s dimensions before purchasing the tank. As soon as you go to the hardware shop, you may double-check the dimensions. Don’t forget to get up some plumber’s tape as well as the tee fitting. A set of screws (1 and a half inch long) and mounting brackets should also be included.

Step 3: Confirm the Water Supply Line for Cold Water

Locate the cold water line that is horizontal to the water heater by going to the cold water line and looking for it. This line will be required in order to establish a connection with the unit.

Step 4: Install the Expansion Tank

To put the unit near to the heater, it should be placed above the pipe that feeds cool water to the unit. Mark a location on the wall where the mounting pipes will be installed and drill few holes in the wall. Attach the cold water supply line to the expansion tank and screw it in place.

Step 5: Attach the Heater Tank

Make your way to the bottom of the connection on the expansion tank and cover the area with plumber’s tape before attaching the connector to the tee fitting at the top. A wrench should be used to tighten this connection. Make sure it’s not too tight.

Step 6: Restore the Water and Power Supply to the Heater

Turn on the water supply to your heater by turning on the water valve. After that, turn on the electricity to your unit by turning on the breakers. If your heater is powered by gas, make sure the gas supply line is in good working order before turning on the gas.

Step 7: Check the Expansion Tank

By turning on the faucet, you may check the tank’s level. After that, place your palm under the faucet to check if the water is hot or cold.

How Do I Know If The Expansion Tank Is Working?

Assume that a diaphragm separates the water from the air in the expansion tank. If it is installed at the end of the water supply pipe that distributes cold water, it will function properly. Gently tap the top and bottom of the expansion tank with your fists. If the tank has a hollow sound, that means it is in great working order. If, on the other hand, you hear a thud, this indicates that water has entered the upper chamber as a result of a damaged diaphragm. Check the temperature of the tank by touching the upper and bottom portions of it.

Because it keeps cold air in the top area, you should get a sense of coldness there.

Common Questions about Installing Water Heater Expansion Tank

Yes, especially if you’re using a closed water supply network.

It is, however, permissible for use in buildings with open water distribution systems. There is no need to be concerned about the expense, as it is less than $50 in total.

2. Should I Place My Expansion Tank Near the

It is necessary to repair an expansion tank that is located near a water heater. This device may be installed anywhere along the water supply line. The majority of the time, it remains attached with a T at the cold water input that provides the water heater with cold water. You can, however, place it on a portion of the cold water supply line if necessary.

3. What is the Perfect Angle for My Expansion Tank?

It is possible to install an expansion tank at any angle you choose. Some manufacturers, on the other hand, advised that you hang it in a vertical orientation. However, any other upright angle is acceptable. Make a hole in the pipe and fasten the clamps with screws. So that it lines up with the tank’s screw holes, it is aligned. However, because it only allows you to set it in a single location, this approach might be annoying. When you acquire an expansion tank, it comes with a saddle fitting installed.

It is designed to fit the pipe while also include features that allow it to be connected to the expansion tank.

How To Replace A Water Heater – And Add An Expansion Tank While You’re At It!

My wife and I recently traveled out of town to work on a project, which required us to be gone for many days. As soon as we returned home on Saturday night, I jumped into a long, hot shower to unwind. I unloaded the truck and dragged the contractor bag stuffed with dirty laundry down to the basement. I was exhausted. Because I was born with great skills of observation, I was the first to notice the large puddle that had developed beneath our water heater. I murmured a stream of peculiar terms common to homeowners and do-it-yourselfers, concluding with something along the lines of “Just what I wanted to do tomorrow — replace a water heater,” or something along those lines.

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Something doesn’t seem quite right, doesn’t it?

Replace A Water Heater – Out With The Old

Disconnecting your non-functioning water heater is generally a basic process. The first step is to deprive it of its fuel supply. If it’s an electric water heater, switch off the circuit breaker and check the voltage using a voltage tester to make sure it’s not blown. Disconnect everything by opening up the panel where the wiring is routed through. Gas heaters should have their gas supply turned off before the flexible supply line is disconnected from the old water heater. Please keep the black pipes that were used to connect the flexible supply line to the water heater; if they are not severely rusted, you should be able to clean the threads on them and reuse them.

Disconnect the gas line and any electrical connections if applicable.

You have the opportunity now.

Replace A Water Heater – And Add An Expansion Tank

Unless you’re planning to add an expansion tank to your “replace a water heater” project, this part is not applicable. Even though it’s really intriguing and educational, if you don’t think it applies to you, you may move ahead to the “Hookup” part. With the advent of building codes in many regions, expansion tanks are now compulsory — and for good reason. If you have a hot water heater, the water will expand as it heats up. When something grows in size, it needs to move somewhere. In the past, the most typical route for excess water to leave was through the water supply itself.

In many towns, reverse flow preventers or check valves are required, which prevent the water from escaping back into the home pipes and converting it to a “closed system.” If the pressure gets up too high, and the enlarged volume of the fluid becomes too large,

The Pressure Is On

It is necessary to match the air pressure within the expansion tank to the water pressure in the pipes as part of the expansion tank installation process. Water pressure in a typical home ranges between 40 and 60 pounds per square inch (p.s.i.). When I connected my recently acquired water pressure gauge, the number soared to more over 140 p.s.i. – and stayed there for the rest of the evening. So that’s why our faucets are always bursting. I tested it on another faucet, thinking to myself, “There’s no way that’s correct.” It’s the same thing.

They stated that the average pressure on our street is 162 pounds per square inch.

At the very least, I knew that my $10 gauge was probably in fine working order.

Replace A Water Heater – The Hookup

When it comes to replacing a water heater, the most difficult aspect is over once the new water heater is in place and operational. The only thing left to do now is drag the old tank out of there; assuming you’re still on good terms with the person who assisted you in bringing the new tank in. Finally, it’s time to connect the new water heater to the rest of the house’s plumbing system. Make careful you clean the threads on the connectors that come off the hot and cold water pipes using a cheap brass or steel wire brush before installing the connections.

Make a test fit to ensure that the connections you purchased are of sufficient length.

Installing An Expansion Tank? Get Pumped!

The expansion tank should be installed after the new water heater has been completely installed. Once you’ve completed all of the necessary plumbing, it’s a straightforward process that takes only a few minutes. This is supposing that you do not need to install or replace your water pressure lowering valve along the way. The pressure in the expansion tank must be equal to or higher than the pressure in your home’s water pipes. When I installed the new reduction valve, I adjusted it so that the pressure was little higher than 60 p.s.i.

The expansion tank is equipped with an inflation valve, similar to those used in a car or bicycle tire.

Thermal Expansion Tank Explained

A common inquiry we receive from clients in Carrollton, TX and the surrounding regions is: “What is that odd looking tank over my water heater?” We respond by asking them: “What is that strange looking tank above my water heater?” “Can you explain me why my plumber told me that I needed a water heater expansion tank?” The hot water pressure isn’t always strong enough for my liking. “What exactly is going on?” Please continue reading if you have lately considered any of these questions. Specifically for you, the professional plumbers at Jennings Plumbing Services have compiled this information about water heater expansion tanks.

Only a licensed and insured plumbing specialist should be hired to complete any and all plumbing work. Jennings Plumbing disclaims all liability for any harm or injury that may arise as a consequence of the use of this information. Any type of use is permitted.

What Does A Thermal Expansion Tank Look Like?

The majority of expansion tanks designed for home usage have a design that is quite similar to a small propane tank. The expansion tank depicted above is a 2-gallon thermal expansion tank that was put on a brand new 50-gallon water heater in a residential residence by Jennings Plumbing Services. As you can see, this one is a light off-white or beige in hue. However, they are also available in the color blue, albeit these are far less popular. On top of each thermal expansion tank is an air valve, similar to the ones seen on the majority of automobile tires.

The bottom of the tank has a threaded connection, which is used to connect the expansion tank to the water heater’s internal piping system.

What Does a Hot Water Heater Expansion Tank Do?

While the water within your water heater will not reach the boiling point, it will continue to expand as the temperature of the water rises. This is referred to as the thermal expansion process, and it is during this phase that the expansion tank is utilized. In the vast majority of circumstances, the increased pressure will simply discharge into your local municipality’s water distribution system, posing little to no threat to public health. Pressure from thermal expansion can begin to build up inside your house’s plumbing system if your plumber has placed a check valve, also known as a pressure regulating valve (sometimes known as a ‘PRV’), on the water supply line that is going into your home.

This might result in significant property damage.

Am I Required To Have One?

For a closed-loop system, it is always wise to include an expansion tank for the heat generated by the system. Excessive water pressure in your plumbing system, in the same way that high blood pressure can eventually wear down your internal organs, can similarly wear down the appliances and fixtures in your house. It is common for the toilet fill valves, supply lines, and the solenoid valves found in washing machines, dishwashers, and ice makers to be the weakest sections of your home plumbing system.

In the event that you have overly high water pressure (anything greater than 80 psi) rushing through your property from the city water supply, an expansion tank will not be able to fix the situation.

What If I Have More Than One Water Heater?

A Water Heater may be present in more than one location in your plumbing system depending on the size of your property. That’s perfectly OK! The use of a single two-gallon thermal expansion tank per heater, or the installation of a single five-gallon thermal expansion tank for both heaters, is normally recommended in these situations, provided that they are both connected to the same close looped system.

However, it is always a good idea to double-check with your local Texas town to ensure that you are meeting all of their criteria! It is also a good idea to look into the specs of the expansion tank manufacturer.

How Long Will My Thermal Expansion Tank Last?

It is extremely difficult to forecast the life expectancy of a Thermal Expansion Tank (TET). With so many variables that can influence how long one lasts, such as the quality of the manufacturer’s materials or manufacturing, the quality of the water, and the appropriate inflation of the tank, it is difficult to predict how long one will last. Tanks can collapse in as little as two years, although there have also been instances when tanks have lasted for eight years or more in extreme circumstances.

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The majority of the tanks we install are covered by a manufacturer’s guarantee that lasts either one or five years.

Do Thermal Expansion Tanks Leak?

Yes, the expansion tank, like every other component of your home’s plumbing system, is susceptible to breakdown over time. The majority of the time, they fail in two ways. After a period of time, the rubber bladder within them wears out, and the tank ceases to operate as a means of reducing thermal expansion as a result. Secondly, corrosion and leakage might occur at the point of connection between the water pipe and the tank’s pressure relief valve. If you want to be sure that the expansion tank does not cause harm, one thing you can do is have it professionally installed by a competent and certified plumber.

He will also put it (if at all feasible) above the water heater pan or somewhere else that will limit the risk of fire if something goes wrong.

Is My Thermal Expansion Tank Working?

NOTE: Before doing any testing, make sure that the shut off valve positioned on the waterline before to the expansion tank itself is operational and operating properly. If a failure happens while you are testing, it has the potential to cause significant damage to your house or other belongings. We always recommend that you have any testing done by a licensed specialist. If you see any evidence of corrosion, immediately turn off the water and call a competent specialist to inspect the situation.

There are a few various things you may take to determine whether or not your expansion tank is functioning properly:

Method 1: Checking Water Pressure

A visibly monitored water pressure is one of the most straightforward ways to determine whether or not your thermal expansion tank is functioning properly. If you want to execute this visual test, turn on the hot water for a longer amount of time and then turn off the hot water for a duration of time after that. In this case, if your thermal expansion tank is functioning properly, there will be no difference in pressure between the two conditions. If, on the other hand, your expansion tank is malfunctioning, you will notice that the pressure is greater, which will gradually fall back to normal as the water continues to flow.

For this test, we recommend that you turn on a faucet so that you may visually evaluate the water pressure before proceeding. Please keep in mind that this is not a final list due to the fact that there are other aspects to consider.

Method 2: Sound Test

Use a metal item such as a coin to tap the top and bottom of the thermal expansion tank to ensure that it is in good working order. When you touch the top of the expansion tank, you should hear a distinct hollow ring because the top side of the tank is meant to be filled with air at this point. The sound of water being present on the underside of the bladder within the expansion tank should be heard if you tap on the tank’s bottom with your fingernail. It is probable that your thermal expansion tank has become faulty if you detect no difference in the noises after the investigation is carried out.

Method 3: Schrader Valve Test

Another easy and reliable approach to check the integrity of your thermal expansion tanks is to do a brief test on the valve located on the top of the tank itself. By releasing air from the tank through this schrader valve, you can ensure that the tank is working. If water is emitted during the test rather than air, this indicates that your expansion tank has been compromised.

Pressure Check: Advanced

The following items will be required for this examination: Bike Tire Pump (one piece) Gauge for measuring water pressure, one (1)

  1. Allow for approximately 15 seconds of continuous flow from your hose bib. This will alleviate any extra pressure that has been produced as a result of thermal expansion. Consequently, the residual pressure will correspond to only the pressure at which your PRV is set
  2. Make a connection between the hose bib and your water pressure gauge to ascertain the water pressure
  3. Turn off the water supply to your home by turning off the main shut-off valve, which is normally located in your front yard. Activate a faucet within your home and let all of the pressure to be released from your system
  4. Go to the expansion tank and link the output of your bicycle pump up to the Schrader valve
  5. Then go back to the house. How much air pressure is present in the tank will be shown by the gauge on your pump. In the event that the

After completing this operation, you can rest comfortable that your expansion tank is now operating as it was intended to do so. If your expansion tank is being installed or replaced, it is quite typical for plumbers to forget this step during the installation process.

Do You Still Have Questions?

Each of our service professionals at Jennings Plumbing Services has undergone extensive training in order to properly diagnose and install expansion tanks. If you have any questions or concerns concerning your expansion tank or its installation, please don’t hesitate to contact us and we will be more than pleased to assist. Take a look at some of our customer testimonials as well!

How To Know If Your Expansion Tank Should Be Replaced

This entry was posted byYour expansion tank is critical to the operation of your home’s plumbing system. Many homeowners, on the other hand, are unsure of when they should repair their expansion tanks. An expansion tank is useful for a variety of reasons. Maintaining your home’s plumbing system over time ensures that it operates smoothly while also preventing unwelcome and expensive problems down the road. Understanding the Function of Expansion Tanks In order to avoid problems caused by excessive pressure from your home’s hot water supply, an expansion tank is installed.

In your house, expansion tanks are located downstream of the inlet valve that provides water to the water heater and other fixtures.

The top section enables water to pass through, while the bottom portion prevents water from passing through.

How to Install Hot Water Heater Expansion Tank

In the case of hot water, it expands when heated, and because it is not compressible, the pressure in the pipes increases if there isn’t any more space. In order to deal with the thermal expansion of water, you must connect the extension tank to the water supply line in order to avoid excessive water pressure from building up. The consequence of excessive pressure in the conduit pipes is serious damage to couplings, fittings, and valves, as well as the water heater, and the expansion tank serves as a safety precaution.

There are several approaches to building an extension tank, but your plumber will tell you that the most effective is to utilize galvanized pipe. It is possible to install on either the hot or cold water pipes; however, the closeness of the pipes is not important.

What You Need

The following components will be required in order to complete a successful expansion tank installation. Tank for the expansion of a water heater Pipe wrenches are a type of wrench that is used to hold pipes together. Hacksaw Drill a pipe threader that is operated by hand Teflon tape is a type of tape that repels water. Pipe joint compound is a type of compound that is used to link pipes together. Screws tee-shirt fitting

Install Your Expansion Tank

The size of your water heater’s expansion tank will be determined by the capacity of your water heater. If you know how much water your water heater can hold, the attendant at your local hardware shop can assist you in acquiring the tank you require. While you’re in the store, you may pick up the tools mentioned previously. Reduce the amount of water that is supplied to your water furnace. Stop water flow at the primary supply line to the house; if your water supply line is equipped with a shut off valve, turn it off there as well.

Determine the location of the horizontal cold water pipe and the location of the expansion tank on the supply pipe.

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