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DHW Production

DHW (Domestic Hot Water) is potable water for uses other than space heat. Some boilers are able to provide DHW "out of the box", while others can do so with the purchase of optional accessories.

No (5)

Yes (3)

Maximum Input Capacity (BTU)

The Maximum Input Capacity describes how quickly the appliance will use fuel when delivering it's maximum capacity. The units may change depending on the fuel being used.

50000 - 59999 (1)

70000 - 79999 (1)

100000 - 109999 (2)

130000 - 139999 (2)

150000 - 159999 (2)

Net I=B=R Capacity (BTU)

I=B=R, also referred to as Net Output or AHRI Capacity, is the rated heat output of a boiler after accounting for combustion efficiency, piping loss, and an extra pickup factor. We recommend sizing steam boilers based on the I=B=R rating.

40000 - 49999 (1)

60000 - 69999 (1)

70000 - 79999 (2)

100000 - 109999 (2)

110000 - 119999 (2)

DOE Heating Capacity (BTU)

Also referred to as Gross Output, this is the output of a boiler after accounting for combustion efficiency. We recommend sizing hot water boilers based on the DOE Heating Capacity.

50000 - 59999 (1)

70000 - 79999 (1)

80000 - 89999 (2)

110000 - 119999 (2)

130000 - 139999 (2)

Combustion Type

Condensing appliances use leftover thermal energy from combustion gases to heat water in a secondary heat exchanger, resulting in higher efficiency and lower exhaust temperature.

Condensing (8)

Modulating/Staging

Stages are unique speeds or levels that equipment can operate at. More stages allow for better fine-tuned control of output, which improves comfort and efficiency. Modulating equipment can operate across a range of levels, giving the highest level of fine-tuned control. Learn More

Modulating (8)

Ultra Low NOx Emissions

NOx is a byproduct of the combustion process, and it's output is regulated in some jurisdictions. Many regulators mirror SCAQMD rules, which regulate air quality for some parts of Southern California. Ultra Low NOx appliances emit less than 10-14 ng/J (nanogram per Joule) of NOx. Learn More

Yes (8)

Learn More About Bosch Thermotechnology ZWB42-3

Bosch Greenstar Combi 151P - 134K BTU - 95.0% AFUE - Combi Gas Boiler - Direct Vent

Model: ZWB42-3

Wall Mounted, Condensing Boiler with Modulating Gas Valve. Ships Packaged. Ratings: 152K BTU Gross Input, 134K BTU DOE Capacity, 117K BTU Net IBR Capacity. Includes Circulator.

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$2,649.00

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Free Shipping & Lift Gate

*This product qualifies for Free Shipping anywhere in the contiguous US. Accessories may ship separately. Items over 100lbs shipped via semi-truck, be sure to select "Lift Gate" to lower the product to the ground curbside. Remote area surcharges may apply, see our full shipping policy for more details.

2% Check Discount

Save 2% instantly by using our convenient "e-check" option or by simply mailing us a paper check. Yes, your order will be delayed slightly (5 business days). But, if you can wait, the savings are significant.

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Learn More About Bosch Thermotechnology 87472071010

Bosch Outdoor Temperature Sensor - For Greenstar Boilers

Model: 87472071010

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$45.00

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Learn More About Bosch Thermotechnology ZBR28-3

Bosch Greenstar 100 - 89K BTU - 95.0% AFUE - Hot Water Gas Boiler - Direct Vent

Model: ZBR28-3

Wall Mounted, Condensing Boiler with Modulating Gas Valve. Ships Packaged. Ratings: 101K BTU Gross Input, 89K BTU DOE Capacity, 79K BTU Net IBR Capacity. Includes Circulator.

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$2,549.00

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Learn More About Bosch Thermotechnology ZBR21-3

Bosch Greenstar 79 - ZBR21 - 71K BTU - 95.0% AFUE - Hot Water Gas Boiler - Direct Vent

Model: ZBR21-3

Wall Mounted, Condensing Boiler with Modulating Gas Valve. Ships Packaged. Ratings: 79K BTU Gross Input, 71K BTU DOE Capacity, 62K BTU Net IBR Capacity. Includes Circulator.

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$2,499.00

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Learn More About Bosch Thermotechnology ZWB28-3

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

Model: ZWB28-3

Wall Mounted, Condensing Boiler with Modulating Gas Valve. Ships Packaged. Ratings: 101K BTU Gross Input, 89K BTU DOE Capacity, 79K BTU Net IBR Capacity. Includes Circulator.

59% Buy This

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$1,899.00

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Est. Ship Date May 20

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Learn More About Bosch Thermotechnology ZWB35-3

Bosch Greenstar Combi 131 - 117K BTU - 95.0% AFUE - Combi Gas Boiler - Direct Vent

Model: ZWB35-3

Wall Mounted, Condensing Boiler with Modulating Gas Valve. Ships Packaged. Ratings: 132K BTU Gross Input, 117K BTU DOE Capacity, 103K BTU Net IBR Capacity. Includes Circulator.

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$3,407.00

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Learn More About Bosch Thermotechnology ZBR16-3

Bosch Greenstar 57 - 51K BTU - 95.0% AFUE - Hot Water Gas Boiler - Direct Vent

Model: ZBR16-3

Wall Mounted, Condensing Boiler with Modulating Gas Valve. Ships Packaged. Ratings: 57K BTU Gross Input, 51K BTU DOE Capacity, 45K BTU Net IBR Capacity. Includes Circulator.

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$2,487.00

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Learn More About Bosch Thermotechnology ZBR35-3

Bosch Greenstar 131 - 117K BTU - 95.0% AFUE - Hot Water Gas Boiler - Direct Vent

Model: ZBR35-3

Wall Mounted, Condensing Boiler with Modulating Gas Valve. Ships Packaged. Ratings: 132K BTU Gross Input, 117K BTU DOE Capacity, 103K BTU Net IBR Capacity. Includes Circulator.

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$3,685.00

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Learn More About Bosch Thermotechnology ZBR42-3

Bosch Greenstar 151 - 134K BTU - 95.0% AFUE - Hot Water Gas Boiler - Direct Vent

Model: ZBR42-3

Wall Mounted, Condensing Boiler with Modulating Gas Valve. Ships Packaged. Ratings: 152K BTU Gross Input, 134K BTU DOE Capacity, 117K BTU Net IBR Capacity. Includes Circulator.

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$3,837.00

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