Product Information
Expansion vessel
Compatible with 6 equipment models
- KWB28 Bosch Greenstar KWB28 Floor Boiler
- KWB35 Bosch Greenstar KWB35 Floor Boiler
- KWB42 Bosch Greenstar KWB42 Floor Boiler
- ZWB28 Bosch Greenstar ZWB28 Wall Boiler
- ZWB35 Bosch Greenstar ZWB35 Wall Boiler
- ZWB42 Bosch Greenstar ZWB42 Wall Boiler
Please note: Hydrowest Products Ltd. is a wholesale distributor and sells exclusively to licensed contractors and trade professionals.
Fast Shipping
In-stock orders ship within 1 business day to anywhere in Canada.
Code-Compliant
All products meet Canadian HVAC and gas code standards.
Wholesale Pricing
Trade pricing for licensed contractors. 40+ years in the industry.
Bosch expansion vessel (PN 87154073280) is a factory replacement component for closed-loop hydronic heating and solar primary circuits, designed to accommodate thermal volume changes and stabilize system pressure during normal operation. Installed at the system expansion port, it helps reduce cycling of pressure-relief and pump-control devices and simplifies servicing, making it appropriate for use with Bosch wall‑mounted condensing boilers and solar pump groups. (bosch-homecomfort.com)
Related Products
Gasket 22,2x30x2
O-ring
O-ring burner flange (outer ring)
Seal (Service cover) WB5-II+
Greenstar Electrode Kit
O-ring 1.23 x 0.14 NBR
Burner sealing
O-ring 13,87x3,53
Lip seal 29,8 x 6,1
Washer
Sealing mounting plate
