ZWB 28-3 Greenstar 100 79,000 BTU Combi Gas-Fired Wall-Hung Condensing Boiler

Heating equipment must be installed, commissioned, and serviced by a licensed and qualified professional in accordance with manufacturer instructions, applicable codes, and industry standards. Manufacturers do not accept warranty or technical support requests from homeowners or unlicensed individuals. All warranty and technical inquiries must be initiated by the licensed professional responsible for the installation.

Rebates:
This product qualifies for a federal tax rebate of 30% of project cost up to $600. Federal Rebate click for more info

In addition to the federal rebate, you may also be eligible for rebates from your local utility company and state. Search your zip code in the link below for information about local rebate programs that may apply to you. Bosch Rebate Center

Note: Product Title reflects this boiler's IBR Net Output Rating.

"Combi" (combination) unit with space heating and integrated water heating in one highly efficient, compact unit. With special insulation to ensure ultra quiet operation and the exclusive keypad safety lock feature to prevent unwanted tampering with heating controls, this unit is the ideal "green" upgrade for detached & terraced houses and is also suitable for apartments.

Energy-saving & environmental features

• Includes CRC200 Programmable Comfort Room Controller
• Aluminum-Silicon heat exchanger delivers high efficiency - 95% with low temperature applications
• Low NOx emissions ahead of 2012 SCAQMD regulations
• Simple, intelligent control options optimize efficiency and fuel consumption
• Low electrical consumption when the boiler is in standby mode
• Electronic ignition
• Anti-cycle and modulation control

End user comfort & convenience features

• Limited lifetime heat exchanger and 5-year parts & labor warranty
• All models available as NG or LP
• Special insulation ensures ultra-quiet operation
• Compact dimensions and built-in frost protection offer flexibility for location of installation
• ECO mode for energy saving fuel consumption
• Exclusive safety feature - keypad safety lock prevents unwanted tampering with heating controls
• Eligible for Tax Credit where offered

Al-Si heat exchanger

Each unit features an ASME approved Al-Si heat exchanger constructed of advanced Magnesium-Aluminum-Silicon alloy - offering increased flexibility versus traditional stainless steel. They are equipped with highly durable heating blocks that are corrosion resistant and designed to optimize clean burning combustion over an extra large surface area, which requires minimal servicing and reliance on spare parts during the boiler's lifetime.

Plated stainless steel heat exchanger

All Greenstar Combi boilers are equipped with a high-strength stainless steel secondary exchanger and burner with double passage - ensuring consistent temperature output based on demand. The DHW hot water temperature control limit of 140°F helps prevent scale build-up within the heat exchanger.

Full modulating fan assembly

A full modulating fan automatically increases or decreases its speed according to the amount of gas coming into the boiler depending on the heat demand. This process, called modulation, prevents the boiler from either having too little or too much air in the unit for optimal combustion - ensuring high efficiency.