What is the purpose of an expansion tank on a water heater?

Its purpose is to deal with thermal expansion of water as it heats up in the water heater – to prevent water pressure from getting too high. If water pressure gets high enough it can damage valves in plumbing fixtures, joints in supply pipes and even the water heater.

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Also to know is, are water heater drain pans required?

So, is a drain pan required under a water heater? In most cases, Yes. … If your water heater is installed in an attic or ceiling space or inside the interior living space, a drain pan is required under your water heater. Drain pans are not required under the water heaters installed in garages in most states.

Also, can electric water heater sit on concrete floor? Electric water heaters can sit directly on the concrete floor. There is no risk of accidental ignition of spilled flammable liquids with electric water heaters. They do not have pilot lights as do their gas counterparts. Electric water heaters never have been required by building codes to be on a stand or lifted up.

Likewise, do I need an expansion tank for my electric 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.

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.

How do I know if my expansion tank is working?

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.

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

A water heater expansion tank costs $40 to $200 with labor adding another $50 to $150. Most come with a little extra space for fluid expansion as it heats up. It’s usually required by code with new construction or when upgrading your current system.

How often should expansion tank be replaced?

Between five and 10 years

Is an 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.

Is it code to install an expansion tank on water heater?

Now most water districts use check valves to protect the supply from contamination. … California Plumbing Code Section 608.3 requires an expansion tank to be installed on the water heater when it is a closed system. A closed system is one that has a check valve, or backflow prevention device.

What happens if you don’t have an expansion tank?

As plumbers know, the expansion tank equalizes pressure throughout the plumbing system by providing a space for hot water to flow into. Without an expansion tank, pressure would be distributed to the entire plumbing system, straining it and decreasing its lifespan.

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

What size expansion tank do I need for a 40 gallon water heater?

General Guidelines for Sizing an Expansion Tank

Water Heater Capacity Supply Pressure (psi) Expansion Tank Size
40 to 60-gallon 40-50 psi 2-gallon
40 to 60-gallon 60-80 psi 3.2-gallon
80-gallon 40 psi 2-gallon
80-gallon 50-60 psi 3.2-gallon

Where should an expansion tank be located?

An expansion tank is generally installed directly above the water heater by means of a tee-fitting installed in the cold water delivery pipe. The expansion tank is usually installed horizontally, though it is acceptable to install it vertically if it is necessary because of space limitations.

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