Expansion Tank Replacement
The expansion tank is the small tank on your water heater or boiler that gives heated water somewhere to go as it expands. When it waterlogs, you see the relief valve drip, hear pipes knock, and watch the pressure climb. We test the tank, confirm it has failed, and fit a new one sized for your system.
- Licensed & InsuredCovered for your peace of mind
- 1-Year Workmanship WarrantyWe stand behind the work we do
- Free Written QuotesClear pricing before any work starts
Signs the Tank Has Failed
A waterlogged tank cannot do its job, and the pressure has to go somewhere.
A dripping relief valve
Water weeping from the relief valve on the water heater or boiler, often into a drain or pan.
Knocking or banging
Pipes that knock as the system heats and the pressure has nowhere to expand.
A heavy tank
Tap the tank and the whole thing sounds dull and full instead of hollow up top.
Pressure that creeps up
A gauge that climbs as the water heats, past where it should sit.
Confirm the Tank, Then Swap It
We check the expansion tank by tapping it and reading the system pressure. A healthy tank sounds hollow near the top, where the air cushion sits. A failed one is heavy and dull all the way up, because it has filled with water and lost its cushion.
When the tank has gone, we isolate it, drain the pressure off, and fit a new tank sized and charged for your water heater or boiler. We confirm the pressure settles where it should before we leave.
When to Replace the Tank
A failed tank puts strain on the whole system, so it is worth sorting early.
A Small Part That Protects the System
You see why the tank failed before we fit a new one.
Tell us what you see
A dripping relief valve or knocking pipes are good clues. Let us know what you notice.
We test and quote
We check the tank and pressure on site and price the work before we touch it.
We replace and confirm
We fit the new tank, set the charge, and confirm the pressure holds steady.
Booking an Expansion Tank Swap
These pages help with booking, service areas, and how we quote before work starts.
Expansion Tank FAQs
As water heats it expands. The tank holds an air cushion that gives that extra volume somewhere to go, so the pressure in your system stays steady.
We tap the tank and read the pressure. A failed tank feels heavy and sounds dull because it has filled with water and lost its air cushion.
A waterlogged tank lets pressure build as the water heats, and the relief valve opens to let it off. A new tank usually stops the drip.
Most replacements are a single visit once we have confirmed the tank is the cause.
Yes. We cover North Vancouver, West Vancouver, the North Shore, and nearby parts of Greater Vancouver.