Bosch KWB28-3 Combi Water Boiler Greenstar Floor (NG or LP)

The Bosch Greenstar KWB28‑3 combi water boiler is a compact, high‑efficiency floor‑standing condensing combination boiler engineered to deliver reliable hydronic heating and continuous domestic hot water from a single, durable appliance. With 100,000 BTU of heating capacity, 95% AFUE, and a dependable 5:1 turndown ratio, this Greenstar combi water boiler is ideal for smaller to mid‑size homes seeking Bosch’s proven 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

Aluminum‑silicon heat exchanger for long‑term durability and efficient heat transfer

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 smaller homes or moderate hot‑water demand

100,000 BTU Heating Output
Efficient, reliable heating performance for compact to mid‑size spaces

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
Small to mid‑size 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