Can you replace the expansion tank on my Weil-McLain boiler?

Yes. BoilerPart.ca supplies and professionally installs the genuine Weil-McLain expansion tank across Greater Vancouver. Our licensed technicians diagnose the fault, fit the correct OEM part, and test the system.

Do you sell the Weil-McLain expansion tank on its own?

No. Boiler parts are supplied and installed by our licensed technicians as part of a repair — we do not sell parts for individual or DIY purchase. We install the Weil-McLain expansion tank as part of a certified repair so it is fitted correctly, tested for safety, and keeps your Weil-McLain warranty valid.

How do I know my Weil-McLain expansion tank has failed?

Typical symptoms include: Pressure climbing then relief valve dripping; Pressure swings on each cycle; Boiler short-cycling; Air in radiators. On Weil-McLain boilers this can also show as Low Water Cutoff Trip or Ignition Lockout. We confirm the diagnosis before any work.

Weil-McLain · Hydronic & Water

Weil-McLain Expansion Tank Replacement in Greater Vancouver

Genuine Weil-McLain expansion tank, supplied and professionally installed by Technical Safety BC–licensed gas fitters. Never sold for DIY.

Call (604) 359-1081 Request Service

The Expansion Tank on Your Weil-McLain Boiler

The expansion tank (expansion vessel) gives heated water room to expand, keeping system pressure stable. A waterlogged or failed tank causes pressure swings, repeated relief-valve discharge, and short-cycling.

On Weil-McLain systems — including models such as ECO, ECO Tec, Ultra — a failing expansion tank often shows up as low water cutoff trip or related symptoms. We diagnose it precisely and install the correct genuine Weil-McLain part.

Typical Lifespan

5-10 years

Brand

Weil-McLain

Part Category

Hydronic & Water

Safety Warning

A relief valve that drips whenever the boiler heats up is usually a failed expansion tank, not a bad valve.

Signs of a Failing Weil-McLain Expansion Tank

Pressure climbing then relief valve dripping

Pressure swings on each cycle

Boiler short-cycling

Air in radiators

Tank feels solid/heavy

Parts Are Professionally Installed — Not Sold for DIY

For your safety and to keep your manufacturer warranty valid, BoilerPart.ca does not sell loose boiler parts over the counter or for self-installation. Under BC regulations, gas appliance components must be installed by a licensed gas fitter. Every part we source is genuine OEM and is professionally fitted, tested, and certified by our Technical Safety BC–licensed technicians as part of a complete repair or installation.