The expansion tank is designed to handle the thermal expansion of water as it heats up in the water heater, preventing excessive water pressure. If water pressure gets to high it can damage valves in plumbing fixtures, joints in supply pipes and the water heater itself.
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How does water expansion tank work?

As hot water enters the heating system, the pressure in the system increases. As pressure increases, the diaphragm in the expansion tank is pushed down. This compresses the air in the tank, creating more space for excess water to enter.

What pressure should expansion tank be set at?

The recommended water pressure is between 50 and 60 PSI. Thermal Expansion Tanks contain an air bladder which is pressurized with air, and expands and contracts to absorb the expanded water from the water heater. needed. Check the air pressure in the Expansion Tank using a tire gauge.

How do I know if my water expansion tank is bad?

The tank should be full of air and therefore sound hollow. If it makes a dull thud rather than a hollow sound, your tank is full of water and needs repair or replacement. You can also gauge this by feeling the tank, which will be cool where it’s holding air and warm where it’s holding water.

Where do you put a potable expansion tank?

Your expansion tank can be anywhere on your plumbing system and does not need to be installed in close proximity to the water heater. It is most commonly installed using a “T” at the cold inlet to the water heater. But, functionally, it can be installed anywhere on the cold inlet line.

How do you bleed an expansion tank?

  1. Turn off the valve that auto-fills the system from your cold water line.
  2. If you have one, open a valve or bleeder on the top of your expansion tank. …
  3. Open a drain valve and drain a suitable amount of water.
  4. Close drain valve and re-open valve you closed in step 1.
Is a expansion tank required by code?

The California Plumbing Code (Section 608.3) and the California Mechanical Code (Section 1005.0) requires a thermal expansion tank, or listed equivalent, to be installed to water heating systems to relieve excessive building pressure during the heating process.

What is the difference between a pressure tank and an expansion tank?

The most significant difference between expansion and pressure tanks is their functionality. An expansion tank handles water expansion and provides protection for water valves and heaters. On the other side, the pressure tank lengthens the lifespan of the pump.

Can expansion tank cause low water pressure?

Before installing an expansion tank, measure the tank’s air pressure charge. When taken from the box, the air pressure in the expansion tanks will likely be lower than your home’s water pressure.

How often should expansion tank be replaced?

Between five and 10 years is the average lifespan of your tank. If your home’s water pressure matches the air pressure in your expansion tank, you can extend the life of your tank. You’ll need to replace it in some cases.

Why does an expansion tank fail?

The first is an air compartment with the pressure set to allow room for the water to expand into, but not to fill the entire tank. … When this happens, the expansion tank turns into a “dead leg” that will eventually cause damage and premature failure to your water heater.

Can an expansion tank explode?

If your house is heated by warm water and radiators you probably have an expansion tank. … Deal with your expansion tank problems as soon as possible. They can be so serious that your tank could even explode.

Is an expansion tank required for a water heater?

While expansion tanks are required by code in most closed-loop water heater systems, they have a reputation for failing. Common expansion tank issues include: Rubber Diaphragm Wear Out.

Can an expansion tank be installed upside down?

Expansion tanks can be installed in any direction. Whether oriented uprightly, horizontally, or even upside down, the expansion tank will function properly without any adverse effects.

Can you install an expansion tank sideways?

Can a water heater thermal expansion tank be installed sideways/horizontally? Most expansion tanks are designed to be installed vertically (stem up or stem down). You can install one sideways, but it will shorten the lifespan unless it is designed and specified by the manufacturer for horizontal installation.

Why is my expansion tank full of water?

Some tanks fail when a leak develops in the diaphragm. This usually causes the tank to fill with fluid and become “water logged.” You can check for this by pressing in the stem of the Schrader valve. If a stream of liquid comes out the tank is toast.

How do you check pressure in an expansion tank?

Once you completely open the valve, you can measure and note the pressure. You can also check your expansion tank’s pre-charge pressure by knocking on the side of the tank with your knuckles to determine if it’s full of air or water. Pre-charge pressure that’s too low may be indicated when the tank is full of water.

How do I know if expansion vessel failed?

If water comes out of the valve you have a definite expansion vessel fault. In this case the vessel has definitely failed and must be replaced. If no water comes out but no air either, you have an expansion vessel fault but the diaphragm may still be intact and it may be possible to re-pressurise.

Where should a hot water heater be located?

Most regulations are fairly simply, and require that water heaters be placed against an external wall of the house. This is why most hot water heaters are in garages or basements. You will want to place your water heater next to an outer wall to make room for the flue.

What does code 11 mean on a Rheem tankless water heater?

Rheem fault code 11 – No ignition. Check to make sure there is gas to the unit and that the pressure is correct. Ensure the ignitor is operational before calling for service. Rheem fault code 16 – This is an over temperature warning which could indicate a possible clogged heat exchanger.

Are expansion tanks required on water heaters in Georgia?

Thermal expansion is necessary when any of the following occurs: A recent water meter replacement. A hot water heater replacement. … When a backflow preventer is installed on the water meter or a pressure reducing valve is installed on the service line.

Do I need an expansion tank if I have a pressure tank?

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. … However, the long-term wear and tear of this excess pressure can reduce the life expectancy of everything in your plumbing system.

Why does the expansion tank go on the cold water side?

One expansion tank manufacturer states: “We recommend the cold water side installation because the tank is not insulated. When the expanded volume enters the tank, it will cool down. With the tank on the cold water side, this expanded volume will pass through the water heater before going out to the faucets.”

Can a well tank be used as an expansion tank?

A well has a well tank that acts as an expansion tank. However, if for some reason a customer has a check valve between the well tank and the water heater they should consider installing a thermal expansion tank between the check valve and water heater.

What should the water pressure be coming into your home?

Normal psi for a home pipe system is between 30 and 80 psi. While you don’t want the psi to be too low, it violates code to be above 80. Instead, you should aim for a psi that’s between 60 and 70.

Can expansion tank cause high water pressure?

Though usually not a problem, thermal expansion can lead to high water pressure and cause expensive problems. The main reason to have an expansion tank in a domestic water system is to prevent the damage from high water pressure, defined as anything over 80 psi.

Do expansion tanks make noise?

A. Dave Yates, a plumbing contractor in York, Pa., responds: The placement of the tank and check valve are fine; that ticking sound you hear is coming from thermal stress taking place in the expansion tank as it accepts expanding water. … Spending a few dollars more on the larger expansion tank should solve the problem.

Can an expansion tank cause water hammer?

An expansion tank is a small football-shaped tank that is half-full of air. This takes care of absorbing the shock when the fast flowing water is suddenly shut off to stop water hammer. … Without the tank, the water pressure builds up and may cause faucets to drip and other problems.

How much water should be in an expansion tank?

Water Heater CapacitySupply Pressure (psi)Expansion Tank Size40 to 60-gallon40-50 psi2-gallon40 to 60-gallon60-80 psi3.2-gallon80-gallon40 psi2-gallon80-gallon50-60 psi3.2-gallon

Why does expansion tank explode?

Water Expands When It’s Heated in Your Water Heater As water heats up, it can expand dramatically, and if it’s hot enough to turn into steam, this can add even more pressure to the water heater. If the relief valve is malfunctioning, this can lead to an explosion.

Why must the expansion tank always be located higher than the boiler?

protect the boiler from excessive water temperatures. … Why must the expansion tank always be located higher than the boiler? To allow air to be pushed up into the expansion tank when adding water into the boiler. The pressure relief valve _____.