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Net I=B=R Capacity (BTU)
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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.
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Enter Net I=B=R Capacity (BTU) Range Minimum Value
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Enter Net I=B=R Capacity (BTU) Range Maximum Value
20000 - 39999 (4)
40000 - 59999 (12)
60000 - 79999 (30)
80000 - 99999 (24)
100000 - 119999 (25)
120000 - 139999 (21)
140000 - 159999 (15)
160000 - 179999 (16)
180000 - 199999 (4)
200000 - 219999 (6)
220000 - 239999 (5)
240000 - 259999 (3)
260000 - 279999 (1)
300000 - 319999 (1)
320000 - 339999 (3)
340000+ (1)
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DOE Heating Capacity (BTU)
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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.
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Enter DOE Heating Capacity (BTU) Range Minimum Value
To
Enter DOE Heating Capacity (BTU) Range Maximum Value
30000 - 49999 (2)
50000 - 69999 (14)
70000 - 89999 (30)
90000 - 109999 (12)
110000 - 129999 (24)
130000 - 149999 (26)
150000 - 169999 (5)
170000 - 189999 (17)
190000 - 209999 (16)
210000 - 229999 (3)
230000 - 249999 (7)
250000 - 269999 (5)
270000 - 289999 (3)
290000 - 309999 (2)
350000 - 369999 (1)
370000 - 389999 (3)
450000 - 469999 (1)
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Heating BTU
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1000 - 10999 (1133)
11000 - 20999 (30)
21000 - 30999 (10)
31000 - 40999 (30)
41000 - 50999 (13)
51000 - 60999 (20)
61000 - 70999 (10)
71000 - 80999 (15)
81000 - 90999 (2)
91000 - 100999 (10)
101000 - 110999 (1)
111000 - 120999 (2)
121000+ (3)
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Maximum Input Capacity (BTU)
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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.
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10000 - 39999 (28)
40000 - 69999 (51)
70000 - 99999 (46)
100000 - 129999 (81)
130000 - 159999 (54)
160000 - 189999 (39)
190000 - 219999 (41)
220000 - 249999 (21)
250000 - 279999 (25)
280000 - 309999 (29)
310000 - 339999 (7)
340000 - 369999 (15)
370000 - 399999 (5)
400000 - 429999 (12)
490000 - 519999 (3)
580000 - 609999 (1)
610000 - 639999 (1)
940000 - 969999 (1)
1000000+ (1)
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AFUE (%)
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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.
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58 - 60 (3)
64 - 66 (8)
67 - 69 (21)
70 - 72 (25)
73 - 75 (8)
76 - 78 (17)
79 - 81 (13)
82 - 84 (93)
85 - 87 (25)
91 - 93 (12)
94 - 96 (56)
97 - 99 (9)
Efficiency (%)
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77 - 78 (1)
93 - 94 (1)
Style
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Curved (14)
Panel (25)
Slab (1)
Slab Coil (2)
Straight (36)
Product Status
Available (1525)
Discontinued (1475)
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Williams - 35K BTU - Room Heater - LP - 68% AFUE
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Grundfos UP - 1/25 HP - Single-Speed Circulation Pump - Bronze - 1/2" Sweat
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Grundfos UP - 1/25 HP - Single-Speed Circulation Pump - Bronze - 3/4" Sweat
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Williams - 65k BTU - Room Heater - NG - 70% AFUE - With Blower
Model: 6501922A
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$2,123.00
$2,016.85
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Grundfos UPS - 1/25 HP - 3-Speed Circulation Pump - Cast Iron - GF 15/26 Flange - Check Valve
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Grundfos UPS - 1/25 HP - Single-Speed Circulation Pump - Bronze - 3/4" Sweat
Model: 59896226
(14)
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$428.00
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Williams - 35K BTU - Room Heater - NG - 68% AFUE - With Blower
Model: 3501922A
(15)
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$1,540.00
$1,463.00
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Grundfos UPS - 1/25 HP - 3-Speed Circulation Pump - Cast Iron - GF 15/26 Rotated Flange - Check Valve
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Grundfos UPS - 1/12 HP - 3-Speed Circulation Pump - Stainless Steel - GF 15/26 Flange - Check Valve
Model: 59896773
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Grundfos UP - 1/25 HP - Single Circulation Pump - Cast Iron - GF 15/26 Flange
Model: 59896180
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Runtal UF - 6,510 BTU - Hot Water Baseboard Radiator - 12" H - 84" W - 2" D
Model: UF-4-84-9010R
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Runtal UF - 5,430 BTU - Hot Water Panel Radiator - 24" H - 36" W - 2" D
Model: UF-8-36-9010R
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$985.00
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Runtal UF - 1,540 BTU - Hot Water Baseboard Radiator - 9" H - 24" W - 2" D
Model: UF-3-24-9010R
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$553.00
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Runtal UF - 1,925 BTU - Hot Water Baseboard Radiator - 9" H - 30" W - 2" D
Model: UF-3-30-9010R
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$573.00
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Runtal UF - 2,310 BTU - Hot Water Baseboard Radiator - 9" H - 36" W - 2" D
Model: UF-3-36-9010R
(9)
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$601.00
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Runtal UF - 2,695 BTU - Hot Water Baseboard Radiator - 9" H - 42" W - 2" D
Model: UF-3-42-9010R
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$626.00
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Runtal UF - 3,080 BTU - Hot Water Baseboard Radiator - 9" H - 48" W - 2" D
Model: UF-3-48-9010R
(9)
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$644.00
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Runtal UF - 3,850 BTU - Hot Water Baseboard Radiator - 9" H - 60" W - 2" D
Model: UF-3-60-9010R
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Runtal UF - 4,620 BTU - Hot Water Baseboard Radiator - 9" H - 72" W - 2" D
Model: UF-3-72-9010R
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Runtal UF - 5,390 BTU - Hot Water Baseboard Radiator - 9" H - 84" W - 2" D
Model: UF-3-84-9010R
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Runtal UF - 6,160 BTU - Hot Water Baseboard Radiator - 9" H - 96" W - 2" D
Model: UF-3-96-9010R
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Runtal UF - 1,860 BTU - Hot Water Baseboard Radiator - 12" H - 24" W - 2" D
Model: UF-4-24-9010R
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Runtal UF - 2,325 BTU - Hot Water Baseboard Radiator - 12" H - 30" W - 2" D
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