Expansion Tank Installation in Yonkers, NY
Protect your water heater and pipes from pressure spikes.
When water heats, it expands. In systems with a check valve or pressure reducing valve, that extra volume has nowhere to go, raising pressure. Expansion tanks absorb it, protecting water heaters, relief valves, and fixtures.
Thermal expansion, explained simply
Water expands when it's heated. A typical tank heater's water grows in volume each time it heats, and that extra water has to go somewhere. In older homes without a check valve or pressure reducing valve on the main, the expansion could push back into the city main. Once a backflow preventer, check valve, or PRV is installed — which is increasingly common — the system becomes “closed,” and that expanding water raises the pressure throughout the plumbing.
Those pressure spikes can make the water heater's relief valve drip or discharge, strain fixture valves and supply hoses, and shorten the life of the heater itself. An expansion tank gives the expanding water a place to go.
How a tank is sized and set up
An expansion tank contains an air cushion separated from the water by a diaphragm. As water expands, it compresses the air, keeping pressure stable. Sizing depends on the water heater's volume, the incoming water pressure, and the heater's temperature setting. The tank's air pre-charge should be set to match the home's water pressure before it's installed, a step often skipped in quick installations.
Tanks should be properly supported, since a full tank can be heavy for the piping it hangs from. We also recommend checking the tank periodically; a waterlogged tank with a failed diaphragm no longer does its job.
What's Included
- Pressure evaluation
- Expansion tank sizing
- Installation near the heater
- Pre-charge adjustment
- Relief valve check
- Testing
Our Process
- 1
Measure system pressure
A gauge reveals your static pressure and any spikes during heating.
- 2
Select the right tank
Size is based on heater volume, pressure, and temperature.
- 3
Set pre-charge
The tank's air charge is adjusted to match your water pressure.
- 4
Mount and support
The tank is installed on the cold supply and properly supported.
Why Choose Expert Plumbing of Yonkers for Expansion Tank Installation
Pre-charge set correctly
A step many installers skip, and the key to proper function.
Relief valve review
We check the heater's relief valve while we're there.
Secure support
Tanks are braced so piping isn't strained.
System understanding
We explain why your home needs one.
Closed systems in Yonkers homes
Many Yonkers homes have pressure reducing valves or backflow devices that create a closed system, making expansion tanks important. A dripping relief valve on a water heater is often a sign one is needed.
Where We Provide Expansion Tank Installation
We offer expansion tank installation throughout greater Yonkers, including:
Frequently Asked Questions
Do I need an expansion tank?+
Likely if your system is closed.
Why is my relief valve dripping?+
Thermal expansion is a common cause.
How long do tanks last?+
Varies; we check them.
Is installation quick?+
Usually.
How do I know if my expansion tank has failed?+
Tap it; a tank that sounds full of water at the top or a relief valve that starts dripping again can indicate a failed diaphragm.
Does a tankless water heater need an expansion tank?+
Tankless units store very little water, so expansion is minimal, but some systems still use one depending on configuration.
Protect Your Water Heater
Schedule expansion tank installation.