Overview
The Bosch green star boiler represents today’s best efficiency technologies brought together in a single package. Astounding efficiency ratings can be achieved with the use of Bosch’s condensing technology, squeezing every last BTU out of your home’s gas supply. An included 3-speed Grundfos pump and a wide variety of pipe venting options allow the boiler to be installed in nearly any home imaginable. This boiler includes a domestic hot water coil, allowing the boiler to act as a tankless hot water heater as well as a hydronic boiler.
Condensing Technology Improves Efficiency
- The ZWB28-3 is a condensing boiler, using the leftover energy in the boiler’s flue exhaust to further heat your home. Keep your home warmer for less energy cost!
Included DHW Coil
- This Bosch greenstar boiler contains an internal domestic hot water coil. This allows the boiler to function as a tankless hot water heater as well as a hydronic water boiler.
Fully Modulating Fan
- The boiler includes a fully modulating fan to control the boiler’s burning rate, allowing optimum efficiency to be achieved during a wide variety of outdoor conditions.
Small Size and Low Installation Clearances
- Low installation clearances on all sides, wall mounting configuration, and small footprint translate into a boiler that can be installed almost anywhere.
Specifications
Combi Gas Boiler Bosch ZWB28 Capacity 110,000 BTU
- ModelZWB28
- Fuel TypeNatural Gas
- Combustion TypeCondensing
- Vent TypeDirect Vent
- Modulating/StagingModulating
- Mount TypeWall
- Minimum Altitude0 Feet
- Maximum Altitude4500 Feet
- Includes PumpYes
- AFUE95%
- Maximum Input Capacity100800 BTU
- Minimum Input Capacity34600 BTU
- DOE Heating Capacity89400 BTU
- Net I=B=R Capacity79000 BTU
- Ultra Low NOx EmissionsYes
- Turndown Ratio5:1
- Phase1
- Frequency60 Hz
- Flue Connection Size3 Inches
- Gas Connection Size3/4 Inch
- Cold Water Inlet3/4 Inch
- Hot Water Outlet3/4 Inch
- Supply Connection1 Inch
- Return Connection1 Inch
- Product Height33 1/2 Inches
- Product Width17 19/48 Inches
- Product Depth13 43/48 Inches
- Product Weight110.2 Pounds
- Shipping Weight118 Pounds
- CSA ListedYes
- ASME CertifiedYes
- AHRI CertifiedYes
- AHRI Reference Number4444522
Combi Gas Boiler Bosch ZWB42 Capacity 150,000 BTU
- ModelZWB42
- Fuel TypeNatural Gas
- Combustion TypeCondensing
- Vent TypeDirect Vent
- Modulating/StagingModulating
- Mount TypeWall
- Minimum Altitude0 Feet
- Maximum Altitude4500 Feet
- Includes PumpYes
- AFUE95%
- Maximum Input Capacity151600 BTU
- Minimum Input Capacity36000 BTU
- DOE Heating Capacity134400 BTU
- Net I=B=R Capacity117000 BTU
- Ultra Low NOx EmissionsYes
- Turndown Ratio5:1
- Phase1
- Frequency60 Hz
- Flue Connection Size3 Inches
- Gas Connection Size3/4 Inch
- Cold Water Inlet3/4 Inch
- Hot Water Outlet3/4 Inch
- Supply Connection1 Inch
- Return Connection1 Inch
- Product Height33 1/2 Inches
- Product Width17 19/48 Inches
- Product Depth13 43/48 Inches
- Product Weight110.2 Pounds
- Shipping Weight118 Pounds
- CSA ListedYes
- ASME CertifiedYes
- AHRI CertifiedYes
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