You need an expansion tank if your home has a closed plumbing system or a pressure-reducing valve. In many Florida municipalities, it is required by code.
Water expands as it heats, which produces increasing pressure in the tank. Without an expansion tank, this intense pressure can damage your water heater and plumbing system.
Here, we’ll look at how an expansion tank works and when it’s required. We’ll also review signs that your water heater needs an expansion tank and when to call a professional for assistance.
Quick Takeaways
- You need an expansion tank if your plumbing system is closed.
- Most modern homes in Bradenton have closed systems.
- Expansion tanks prevent excess pressure damage.
- Without one, your T&P valve may leak or fail.
- Many Florida building codes require expansion tanks.
- A licensed plumber can confirm if your system needs one.
What Does an Expansion Tank Do?
In many homes, water heaters have a closed system. In this type of system, a valve prevents water from flowing back to the main water supply.
Because water expands as the temperature heats up and it can’t escape, pressure build in the tank. The purpose of an expansion tank is to absorb this excess pressure.
By doing so, it protects:
- Water heater tank
- Plumbing pipes
- Fixtures
- Shutoff valves
What Is a Closed Plumbing System?
A closed system uses either a backflow preventer or a check valve to prevent water from flowing backward and re-entering the supply line. A check valve is a basic feature that ensures the one-way flow of water from the main water supply into a home. Its important purpose is to prevent backflow that could contaminate the public water supply.
A more complex version of a basic check valve is a backflow preventer. This feature has multiple fail-safes, including a relief valve as well as two check valves. A pressure-reducing valve, or PRV, is also a critical aspect of a closed plumbing system. It remains closed until pressure in the tank reaches a dangerous level. Its purpose is to release excess pressure.
Closed water systems are used in Florida homes that have a tank water heater when the municipal water supply is used. Because this is enforced by modern building codes, newly installed water heaters must also be closed systems.
When Is an Expansion Tank Required?
An expansion tank is an essential safety feature for a closed system, and it’s required for tank that use a pressure relief valve or a backflow device. In addition, local building codes throughout Florida require the use of an expansion tank.
Whether you’re building a new home or replacing an existing hot water heater, check the local codes in Bradenton and surrounding areas.
Signs You May Need an Expansion Tank
If your home uses an older water heater or isn’t located in an area where an expansion tank is required, you could still benefit by installing one.
Here are some sure signs that your water heater needs an expansion tank:
T&P relief valve dripping- High water pressure readings
- Water hammer noise
- Premature water heater failure
- Repeated plumbing leaks
What Happens If You Don’t Install an Expansion Tank?
While an expansion tank may not be required in all areas, it plays a critical role for homeowners.
Here’s what could happen if you don’t install an expansion tank in your home:
- Increased internal tank pressure
- Shortened water heater lifespan
- Damaged fixtures
- Potential warranty void issues
- Higher repair costs over time
Do Tankless Water Heaters Need an Expansion Tank?
Expansion tanks aren’t only for tank water heaters. Even a tankless water heater needs an expansion tank if it’s on a closed system. Remember, the plumbing system rather than the water heater type determines the need for an expansion tank.
How a Plumber Determines If You Need One
Because an expansion tank is a critical safety feature, it’s important to consult with a plumber for a tailored recommendation for your home. To determine if your water heater needs an expansion tank, your plumber will refer to local code requirements.
Your plumber will also take into account if your water heater is on a closed system. This can be detected through the presence of a PRV and a backflow device. Other factors that are taken into account are the water pressure as well as the age and condition of the water heater.
FAQ About Expansion Tanks
How do I know if my home has a closed plumbing system?
A closed plumbing system will have a pressure-reducing valve located close to the main water shutoff valve. Your plumber only needs a few minutes to confirm if your home has a closed plumbing system.
Is an expansion tank required by Florida building code?
Building codes are established and enforced at the local level, so it’s important to consult with a licensed plumber who is knowledgeable about local codes. Typically, however, an expansion tank is required for closed plumbing systems and new water heater installations.
Can I install an expansion tank myself?
While it’s technically possible for a homeowner to install an expansion tank as a do-it-yourself project, this isn’t recommended. Improper pressure matching and sizing will result in failure. With professional installation, the process is completed to code and in a safe manner.
How long does a water heater expansion tank last?
Depending on water quality and pressure, the typical water heater expansion tank will serve your needs for five to 10 years.
Will an expansion tank stop my T&P valve from leaking?
If your T&P valve is leaking due to thermal expansion, installing an expansion tank will resolve the problem. As a first step, schedule a professional diagnosis with a licensed plumber.
Protect Your Water Heater Before Pressure Causes Damage
Water pressure problems create exceptional wear and stress on a water heater. This results in otherwise preventable damage and high repair bills.
More than that, pressure problems can lead to early tank failure and the premature need for a replacement. With a professional water heater inspection, you’ll get customized recommendations for preventative protection.
Learn How to Optimize Your Water Heater
Benjamin Franklin Plumbing of Bradenton is your trusted source for reliable and professional plumbing services in Bradenton, FL and nearby areas. We inspect, repair, and protect water heaters the right way, so you’re not dealing with pressure damage later.
From expansion tank inspections to full water heater repair services, you can count on our problems to give your water heater the attention it needs. Schedule a water heater service for your home today.