FAQ: Why Do I Need An Expansion Tank For Water Heater?

Do I really need an expansion tank on my water heater?

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.

Can you install water heater without expansion tank?

Water expands as it heats up, and without an expansion tank attached to the water heater, a closed plumbing system can experience damage from this thermal expansion.

Are expansion tanks mandatory?

So, are water heater expansion tanks required? Most cities require residential plumbing systems to be closed water heater systems. When a new water heater is installed on a closed system, an expansion tank is required by building codes. Expansion tanks are not required for open plumbing systems.

How much does it cost to install an expansion tank on a water heater?

The cost to install a thermal expansion tank can range from $300 to $400. Often the expense of the thermal expansion tank is included in the cost of the new water heater.

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Does the expansion tank go on the hot or cold side?

Although expansion tanks can be installed on the hot side, we strongly recommend they be installed on the cold line, downstream of the shutoff valve.

Where should an expansion tank be located?

The expansion tank (potable water type) should be installed on the inlet cold-water line. It can be installed anywhere in the building on the cold-water supply (after the regulator). It is usually installed by plumbers on the cold-water inlet of the water heater.

What happens when an expansion tank fails?

Oftenthe diaphragm dividing the two systems will fail, causing the two systems to become one. When this happens, the expansion tank turns into a “dead leg” that will eventually cause damage and premature failure to your water heater.

Can you install expansion tank 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. Without proper support, the expansion tank could break off its mounting pipe — especially if the tank fails and fills with water.

Can an expansion tank explode?

In fact, the tank may explode! Thermal Expansion Can Cause Hot Water Heaters to Explode! A typical hot water heater in an “open” sys- tem has only a temperature and pressure (T&P) valve to prevent a rupture of the hot water heater (figure A). This compressibility allows the ex- panding hot water a place to go.

What PSI should my expansion tank be?

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.

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How far can expansion tank be from water heater?

The tank can be installed anywhere in the cold-water line between the house’s main valve and water heater, or on the hot-water line within 3 ft. to 5 ft. of the water heater. An expansion tank should be installed in conjunction with a pressure-reducing valve in high-pressure situations.

How much should a 50-gallon water heater cost installed?

A new 40- to 50-gallon hot water heater costs $330 to $2,000 for the unit alone, plus the plumber labor cost to install is $200 to $1,000. Gas water heaters cost $100 to $700 more than electric to install. *Price ranges include materials and labor.

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