The Bosch Greenstar KWB42‑3 is a premium floor‑standing condensing combination boiler engineered to deliver powerful hydronic heating and continuous domestic hot water from a single, high‑efficiency appliance. With 151,000 BTU of heating capacity, 95% AFUE, and a reliable 5:1 turndown ratio, this Greenstar model is ideal for homeowners seeking Bosch’s renowned performance in a traditional floor‑mount configuration. It operates on natural gas or propane, offering flexibility for a wide range of installations.
Key Features
High‑Efficiency Condensing Technology
95% AFUE for excellent energy savings
Proven aluminum‑silicon heat exchanger for long‑term durability
Low NOx emissions for cleaner, environmentally responsible operation
Combi System: Heat + Hot Water
Provides hydronic space heating and on‑demand domestic hot water
Eliminates the need for a separate water heater
Ideal for homes with moderate to high hot‑water demand
151,000 BTU Heating Output
Strong, reliable heating performance for larger homes
Smooth, consistent operation even during colder weather
5:1 Turndown Ratio
Efficient burner modulation for precise temperature control
Reduces cycling and improves overall system efficiency
Fuel Flexibility
Operates on natural gas or propane
Suitable for both urban and rural installations
Floor‑Standing Design
Stable, durable cabinet ideal for basements and mechanical rooms
Excellent replacement option for older floor‑mount boilers
Bosch Standard Controls
Simple, intuitive interface
Built‑in diagnostics streamline service and maintenance
Compatible with Bosch smart controls and outdoor reset options
Dimensions
Height: 41.0 in
Width: 17.3 in
Depth: 23.0 in
Ideal For
Homes needing both hydronic heat and domestic hot water
High‑efficiency natural gas or propane installations
Replacement of older floor‑standing boilers
Mechanical rooms where wall‑mounting isn’t practical
We service and install all types of HVAC heating and cooling equipment throughout Long Island, including (but not limited to) this coverage area:
Nassau County: Oyster Bay, Hempstead, North Hempstead, Glen Cove, Long Beach, Freeport, Valley Stream, Garden City, Great Neck, Mineola, Hicksville, Levittown, Massapequa, Bethpage, Plainview, Syosset, Jericho, Westbury, Rockville Centre, Farmingdale
Suffolk County: Huntington, Babylon, Islip, Smithtown, Brookhaven, Riverhead, Shelter Island, Southold, Southampton, East Hampton, Commack, Deer Park, Lindenhurst, Bay Shore, Brentwood, Central Islip, Hauppauge, Centereach, Selden, Medford, Patchogue, Shirley
Contact us today at (631) 779-3196
