Buderus

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Buderus takes a comprehensive approach to hydronic efficiency. You can find everything from condensing boilers and panel radiators to domestic hot water tanks and solar heating systems in their catalog.

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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.

60000 - 79999 (2)

80000 - 99999 (3)

100000 - 119999 (3)

120000 - 139999 (5)

140000 - 159999 (1)

160000 - 179999 (2)

180000 - 199999 (1)

200000 - 219999 (3)

240000 - 259999 (2)

260000 - 279999 (2)

280000 - 299999 (4)

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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.

50000 - 59999 (1)

60000 - 69999 (1)

70000 - 79999 (3)

90000 - 99999 (3)

110000 - 119999 (5)

130000 - 139999 (1)

140000 - 149999 (2)

160000 - 169999 (1)

180000 - 189999 (2)

190000 - 199999 (1)

220000 - 229999 (4)

250000 - 259999 (4)

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Heating BTU

2000 - 2799 (5)

2800 - 3599 (4)

3600 - 4399 (4)

4400 - 5199 (3)

5200 - 5999 (2)

6000 - 6799 (5)

6800 - 7599 (2)

7600 - 8399 (3)

8400 - 9199 (1)

9200 - 9999 (1)

10000 - 10799 (1)

11600 - 12399 (1)

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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.

70000 - 89999 (2)

90000 - 109999 (5)

110000 - 129999 (1)

130000 - 149999 (4)

150000 - 169999 (7)

170000 - 189999 (2)

190000 - 209999 (3)

210000 - 229999 (2)

230000 - 249999 (3)

290000 - 309999 (4)

330000 - 349999 (2)

350000+ (2)

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AFUE (%)

AFUE (Annual Fuel Utilization Efficiency) measures the efficiency of combustion equipment over the entire heating season, and is calculated by dividing the amount of energy that is actually heating your home by the total energy contained in the fuel used by the boiler/furnace. Learn More

84 (4)

85 (3)

86 (10)

87 (6)

93 (2)

96 (3)

Vent Type

Products that use combustion (burning) of fuel to create heat also create potentially dangerous gasses that need to be exhausted (AKA "Vented"). Depending on the product, venting can be done via a chimney, through a side wall, or use a second vent to provide fresh air to the appliance.

Chimney or Direct Vent (3)

Chimney Vent (45)

Direct Vent (5)

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 (5)

Single Stage (23)

Fuel Type

To create heat, some form of fuel is required. Fuel Type specifies what the product uses as an input to create heat.

Natural Gas (12)

Oil (16)

Buderus SSB85 - 79K BTU - 96.0% AFUE - Hot Water Gas Boiler - Direct Vent

Model: SSB-85

Floor Mounted, Condensing Boiler with Modulating Gas Valve. Ships Packaged. Ratings: 85.3K BTU Gross Input, 79K BTU DOE Capacity, 69K BTU Net IBR Capacity. Includes Circulator.