Bosch Thermotechnology ZWB28-3
Bosch Thermotechnology ZWB28-3
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Bosch Greenstar Combi 100 - 89K BTU - 95.0% AFUE - Combi Gas Boiler - Direct Vent

Model:

ZWB28-3

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Bosch Greenstar Combi 100 - 89K BTU - 95.0% AFUE - Combi Gas Boiler - Direct Vent
Bosch Greenstar Combi 100 - 89K BTU - 95.0% AFUE - Combi Gas Boiler - Direct Vent
Model: ZWB28-3
$1,899.00
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Specifications
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Recommended Accessories

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Expert Recommended Accessories Selected by Bob, our Expert
Required Accessories 9
These accessories are required to properly setup/install this product.
Optional Accessories 10

Features

    The Bosch greenstar 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.
California residents see
Warning: This product can expose you to chemicals including Lead which is known to the State of California to cause Developmental Harm.
For more information go to: www.p65Warnings.ca.gov

Specifications

ZWB28-3
specs product image PID-37392
General Information
Product Line
Greenstar
Medium Learn More
Hot Water
Fuel Type Learn More
Natural Gas
Combustion Type Learn More
Condensing
Vent Type Learn More
Direct Vent
DHW Production Learn More
Yes
Modulating/Staging Learn More
Modulating
Mount Type
Wall
Minimum Altitude
0 Feet
Maximum Altitude
4500 Feet
Includes Pump
Yes
Assembly Type
Packaged
Gas Conversion Kit
Included
Performance
AFUE Learn More
95 %
Maximum Input Capacity Learn More
100800 BTU
Minimum Input Capacity
34600 BTU
DOE Heating Capacity Learn More
89400 BTU
Net I=B=R Capacity Learn More
79000 BTU
Ultra Low NOx Emissions Learn More
Yes
Turndown Ratio
5:1
Electrical Data
Phase
1
Frequency
60 Hz
Dimensions
Flue Connection Size
3 Inches
Gas Connection Size
3/4 Inch
Cold Water Inlet
3/4 Inch
Hot Water Outlet
3/4 Inch
Supply Connection
1 Inch
Return Connection
1 Inch
Product Height
33 1/2 Inches
Product Width
17 19/48 Inches
Product Depth
13 43/48 Inches
Product Weight
110.2 Pounds
Shipping Weight
118 Pounds
Certifications
Country of Origin
United States
CSA Listed
Yes
ASME Certified
Yes
AHRI Certified
Yes
AHRI Reference Number
4444522
Warranty Information
Parts Warranty Learn More
5 Years
Heat Exchanger Warranty
Limited Lifetime Years

Reviews

(4)
Bosch Thermotechnology ZWB28-3 Reviews & Ratings

Product Q&A

(3)
Product Questions Answered by Bob, the Heating Product Expert
I am at an altitude of 6500 ft. This unit says max 6000. Can I still use it with just less efficiency or can you recommend another similar unit? I need heat only for an in-floor radiant system.
Glenn M. 
from Connecticut 
October 26, 2016
Can this unit be retrofitted to use propane gas?
John McNew 
from New Mexico 
May 31, 2016
What would be the appropriate pressure setting for the relief valve?
Angie 
from New York 
September 09, 2015

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Bosch Greenstar Combi 100 - 89K BTU - 95.0% AFUE - Combi Gas Boiler - Direct Vent
Bosch Thermotechnology ZWB28-3
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