- 1 Is an expansion tank necessary?
- 2 What’s the tank on top of water heater?
- 3 How does an expansion tank work on a water heater?
- 4 What happens when an expansion tank fails?
- 5 Where should an expansion tank be located?
- 6 How do I know if my water heater expansion tank is bad?
- 7 How do I know if my water system is closed?
- 8 How long do water heaters last?
- 9 How much does it cost to install an expansion tank on a water heater?
- 10 How much air should be in an expansion tank?
- 11 How often should expansion tank be replaced?
- 12 Why does my expansion tank keep filling up?
- 13 Can an expansion tank explode?
- 14 Why does the expansion tank go on the cold water side?
Is an expansion tank necessary?
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.
What’s the tank on top of water heater?
The expansion tank serves as a backup system to prevent overworking your plumbing. The excess water volume, instead of causing too much pressure on the plumbing, rushes into the expansion tank and lowers the pressure in the water heater to safer levels. This ultimately protects it from damage.
How does an expansion tank work on a water heater?
When your water thermally expands, a water heater expansion tank prevents unwanted increases in pressure. Water expands by roughly 2% as it heats up from 50° F to 120° F. You install the expansion tank down the line from the inlet valve that sends hot water into your home.
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.
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.
How do I know if my water heater expansion tank is bad?
How to Tell If an Expansion Tank is Working
- Tap on the tank. It should be hollow about half way up.
- Check the temperature by feeling the top and bottom of the tank.
- Use an air gauge to check the pressure inside the tank.
- Check to see if your release valve is spurting water.
How do I know if my water system is closed?
If you see a backflow prevention device (like a check valve or pressure-reducing valve) connected to your main water shutoff valve, then you have a closed plumbing system. Your water shutoff valve is usually located:
- On an outside wall.
- In a basement.
- In a utility room or closet.
How long do water heaters last?
How Long Do Water Heaters Last? Based on the manufacturer’s suggested service life, the life expectancy of a water heater is about eight to 12 years. That varies with the location and design of the unit, quality of installation, maintenance schedule and water quality.
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.
How much air should be in an expansion tank?
Expansion tanks are pre-charged with a 40 PSI air charge. If the inlet water pressure is higher than 40 PSI,the expansion tank’s air pressure must be adjusted to match that pressure but must not be higher than 80 PSI.
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 my expansion tank keep filling up?
The most common expansion tank problem in a diaphragm tank is losing small amounts of air through the valve. When this occurs, more air needs to be added to the tank. If the tank does not hold its air pressure after you complete this fix or it fills with excess water, you may need to replace the diaphragm.
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.
Why does the expansion tank go on the cold water side?
“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.”