Expansion Tank Service
Water Expansion Tank Installation & Repair
A small device that protects your entire plumbing system from pressure spikes. Installed, replaced, and serviced right.
Pressure Protection
Protect Pipes, Fixtures & Water Heaters
When water heats up, it expands. This is called thermal expansion, and in a closed plumbing system (common in modern homes with pressure-reducing valves) that extra volume has nowhere to go. The added pressure stresses pipes, fittings, and your water heater, which is exactly what a thermal expansion tank is built to prevent.
An expansion tank absorbs that pressure safely. If yours is failing or you don’t have one, you’ll see drips from the water heater relief valve, fluctuating pressure, or recurring fixture leaks.
We size and install expansion tanks correctly, set the proper pre-charge pressure, and mount them where they’ll perform. And last.
- Expansion tank installation
- Tank replacement and repair
- System pressure assessment
- Pre-charge pressure adjustment
- Proper mounting and placement
- Code-compliant configurations
What We Offer
Our Services
New Tank Installation
Required for most closed plumbing systems and updated to current code. We size and install correctly the first time.
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Tank Replacement
Waterlogged or corroded tanks lose their function. We replace failing tanks before they cause water heater or fixture damage.
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Pressure Diagnosis
If you’re seeing pressure issues, we measure incoming and system pressure to confirm the expansion tank is the right fix.
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Signs You Need Expansion Tank Service
01
Water heater relief valve drips frequently
02
Fluctuating water pressure in the home
03
Recurring leaks at fixtures
04
Tank feels heavy or waterlogged
05
Visible corrosion on the tank
06
Newer pressure-reducing valve installed
Why Homeowners Choose Metcalf
$0
Commissions
Our plumbers are paid hourly. They have zero incentive to upsell you.
23+
Years
Over two decades serving Baltimore-area homeowners.
Same-Day
Response
Fast response times because we know plumbing emergencies can’t wait.
4.9
Stars
Hundreds of five-star reviews from satisfied customers.
PRESSURE MATTERS
Why Closed Plumbing Systems Need Expansion Tanks
Most modern homes have closed plumbing systems with backflow preventers or check valves at the meter. Water can come in, but it can’t push back out toward the street.
When your water heater fires up, the heated water expands. In a closed system, that expansion has nowhere to go. Pressure spikes can easily exceed 150 PSI and stress every joint, valve, and fixture in the house.
An expansion tank absorbs that extra pressure with an internal air bladder, protecting your water heater, your pipes, and your fixtures. And extending the life of the entire system.
Thermal expansion tank installation is straightforward, code-driven work when the tank is sized and pre-charged correctly. We handle new installs and replacements for homeowners in Catonsville and across Baltimore and Howard County, and we provide upfront estimates before any work begins.
Good to Know
Frequently Asked Questions
What is a thermal expansion tank and what does it do?
A thermal expansion tank absorbs the extra pressure created when water heats and expands, protecting your water heater, pipes, and valves from stress. On a hot water heater it is often called a water heater thermal expansion tank.
Do I need an expansion tank?
If you have a closed plumbing system (common with a backflow preventer or pressure-reducing valve), code typically requires one. We’ll confirm for your setup.
What are the signs of a failed expansion tank?
Pressure spikes, a discharging temperature-and-pressure valve, or banging pipes. A waterlogged tank no longer cushions pressure and should be replaced.
How long do expansion tanks last?
Generally 5 to 10 years. It’s smart to check it whenever the water heater is serviced.
Can you install one with my water heater?
Yes. We often install or replace the water heater and expansion tank together. Call (410) 242-3111.
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