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Indirect Water Heater (11)

Panel (32)

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. -

Enter DOE Heating Capacity (BTU) Range Minimum Value To Enter DOE Heating Capacity (BTU) Range Maximum Value

80000 - 99999 (1)

100000 - 119999 (1)

120000 - 139999 (3)

160000 - 179999 (2)

200000 - 219999 (2)

240000 - 259999 (2)

260000 - 279999 (1)

280000 - 299999 (1)

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. -

Enter Net I=B=R Capacity (BTU) Range Minimum Value To Enter Net I=B=R Capacity (BTU) Range Maximum Value

70000 - 79999 (1)

90000 - 99999 (1)

110000 - 119999 (3)

140000 - 149999 (2)

180000 - 189999 (2)

220000 - 229999 (3)

250000 - 259999 (1)

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)

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. -

100000 - 119999 (3)

120000 - 139999 (3)

140000 - 159999 (3)

160000 - 179999 (3)

180000 - 199999 (2)

220000 - 239999 (3)

280000 - 299999 (3)

320000 - 339999 (1)

340000 - 359999 (1)

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 -

86 (8)

87 (3)

93 (1)

96 (1)

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 (27)

Direct Vent (3)

Fuel Type

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

Indirect Fired (11)

LP to NG (3)

Natural Gas (2)

NG to LP (4)

Oil (13)

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 (2)

Staging (11)

Product Status

Available (85)

Discontinued (1)

Buderus Model 21 - 5,427 BTU - Hot Water Panel Radiator - 20" H x 48" W x 2.5" D

Model: 7750102312

(4)

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$668.00