Ratings
Series 4FH-50 FORCED DRAFT FIREBOX GENERATOR
4FH-50 Boiler Models
63 78 92 107 127 154 180 209 240 277 311 345 360A 450A 563A 675A
Gross Output MBH
BHP
Lbs. Stm/Hr.
422
12.6
435
522
15.6
538
616
18.4
635
716
21.4
738
850
25.4
876
1,031
30.8
1,063
1,205
36.0
1,242
1,400
41.8
1,442
1,607
48.0
1,656
1,855
55.4
1,911
2,082
62.2
2,146
2,310
69.0
2,381
2,410
72.0
2,484
3,015
90.0
3,108
3,770
112.6
3,885
4,520
135.0
4,660
Net Rating - Steam
MBH
Sq. Ft.
327
1,365
405
1,690
478
1,990
556
2,315
660
2,750
800
3,335
935
3,895
1,086
4,525
1,247
5,195
1,439
5,995
1,616
6,735
1,793
7,470
1,870
7,790
2,340
9,750
2,926
12,190
3,508
14,615
Net Rating - Water
MBH 367 454 536 623 740 897 1,048 1,218 1,398 1,614 1,811 2,010 2,097 2,623 3,280 3,932
Firing Rate Gas MBH
Light Oil GPH*
Heavy Oil GPH**
528
3.8
—
653
4.7
—
770
5.5
—
895
6.4
—
1,063
7.6
—
1,289
9.2
—
1,506
10.8
—
1,750
12.5
—
2,009
14.4
—
2,319
16.6
—
2,603
18.6
—
2,888
20.6
—
3,013
21.5
20.1
3,769
27.0
25.2
4,713
33.6
31.4
5,650
40.4
37.7
Heating Surface - Sq. Ft.
Fireside
Waterside
59
63
73
78
86
92
101
107
120
127
145
154
168
180
194
209
224
240
257
277
289
311
320
345
360
398
450
497
563
622
675
746
Furnace Volume - Cu. Ft. 8.8 10.7 12.6 14.6 18.3 21.9 25.3 29.1 34.7 39.7 44.4 49.1 58.9 68.0 89.3 104.7
Heat Release - MBH/Cu. Ft.
60.0 61.0 61.1 61.3 58.1 58.8 59.5 60.1 57.9 58.4 58.6 58.8 51.2 55.4 52.8 53.9
Water Content - Gal.
Steam
Water
65
90
81
112
94
132
110
153
133
168
145
196
172
232
198
268
214
288
245
329
274
369
302
408
470
569
537
666
683
801
788
951
Approx. Dry Weight - Lbs. 1,700 1,900 2,100 2,600 2,700 3,100 3,300 3,600 4,200 4,400 5,300 5,600 6,700 8,700 9,300 10,400
Approx. Full Weight - Lbs.
Steam
Water
2,240
2,450
2,570
2,835
3,090
3,195
3,510
3,870
3,800
4,095
4,300
4,735
4,730
5,235
5,250
5,830
5,980
6,595
6,435
7,140
7,575
8,365
8,110
8,995
10,615
11,495
13,290
14,255
14,825
15,975
16,970
18,325
4FH-50 Boiler Models
360A-3 450-A 563A-3 675A-3 827 993 1157 1323 1654 1985 2315 2645 3075
Gross Output MBH
BHP
Lbs. Stm/Hr.
2,658
79.4
2,739
3,100
92.6
3,195
3,769
112.6
3,885
4,432
132.4
4,568
5,537
165.0
5,706
6,648
199.0
6,852
7,746
231.0
7,983
8,857
265.0
9,129
11,074
331.0
11,413
13,290
397.0
13,697
15,499
463.00
15,974
17,708
529.0
18,252
20,587
615.0
21,217
Net Rating - Steam
MBH
Sq. Ft.
2,063
8,596
2,406
10,025
2,925
12,188
3,439
14,329
4,299
17,910
5,161
21,505
6,014
25,060
6,877
28,655
8,598
35,825
10,318
42,995
12,033
50,140
13,748
57,285
15,976
66,525
Net Rating - Water
MBH 2,312 2,697 3,279 3,856 4,817 5,784 6,739 7,706 9,634 11,562 13,484 15,406 17,911
Firing Rate Gas MBH
Light Oil GPH*
Heavy Oil GPH**
3,323
23.7
22.2
3,875
27.7
25.8
4,711
33.7
31.4
5,540
39.6
36.9
6,921
49.9
46.6
8,310
60.0
56.0
9,683
70.0
65.3
11,071
80.0
74.7
13,843
99.0
92.4
16,613
119.0
110.7
19,374
139.0
129.3
22,135
158.0
148.0
25,734
184.0
172.0
Heating Surface - Sq. Ft.
Fireside
Waterside
397
429
463
500
563
608
662
715
827
893
993
1,072
1,157
1,250
1,323
1,429
1,654
1,786
1,985
2,143
2,315
2,500
2,645
2,857
3,075
3,321
Furnace Volume - Cu. Ft. 58.9 68.0 89.3 104.7 115.6 139.2 160.7 186.5 234.0 301.6 348.6 383.8 505.6
Heat Release - MBH/Cu. Ft.
56.4 57.0 52.8 52.9 59.9 59.7 60.3 59.4 59.2 55.1 55.6 63.5 50.9
Water Content - Gal.
Steam
Water
421
519
492
676
602
740
712
875
761
1,003
925
1,220
1,050
1,330
1,227
1,554
1,443
1,826
1,720
2,147
1,979
2,473
2,173
2,718
2,814
3,665
Approx. Dry Weight - Lbs. 6,900 8,800 11,000 12,400 14,800 18,300 19,200 19,800 23,000 28,000 34,500 38,200 49,000
Approx. Full Weight - Lbs.
Steam
Water
10,450
11,225
12,900
14,430
14,315
15,465
16,930
18,290
18,970
20,325
22,500
24,950
27,040
29,375
29,415
32,140
35,010
38,200
42,320
45,870
50,970
55,085
56,290
60,820
72,430
79,510
RATINGS AND DATA
Ratings based on 5 square feet of heating surface per boiler horsepower.
* Light Oil - 140,000 BTU/GAL
** Heavy Oil - 150,000 BTU/GAL