Case type
Expansion tanks
Water hammer, relief-valve discharge, and pressure spikes often point to a failed or missing thermal expansion tank.
The evidence
What we look for
- T&P valve discharging intermittently
- Pressure that rises when the heater cycles
- Water hammer after fixtures close
- Waterlogged or corroded expansion tanks
- Closed-system plumbing without expansion capacity
The investigation
How we work the case
We measure static and dynamic pressure, check the expansion tank charge, and confirm whether the tank or related valves failed.
The solution
Case closed
Expansion tanks are sized, charged, and installed correctly so thermal expansion is absorbed safely.
Service areas
Expansion tanks by area
We take this case across Seattle, the Eastside, and Snohomish County. Choose your city for a local file.
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