Product Information
Greenstar Pump USA (ZWB) Combi Boiler
Compatible with 8 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
- ZWB28-3A Bosch Greenstar Pro ZWB28-3A Wall Boiler
- ZWB35 Bosch Greenstar ZWB35 Wall Boiler
- ZWB42 Bosch Greenstar ZWB42 Wall Boiler
- ZWB42-3A Bosch Greenstar Pro ZWB42-3A 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 Greenstar Pump (USA) for ZWB combi boilers is an OEM circulator assembly designed for ZWB-series Greenstar combi applications, providing dependable primary-loop and domestic hot-water circulation to maintain consistent heat delivery and on-demand hot water during service or retrofit work. Suited for field replacement on ZWB combi units, this genuine Bosch part supports straightforward integration and easier servicing for contractors and wholesale service departments.
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
