4
WARNING
Your Dura-Max boiler is not designed to operate with a boiler inlet water temperature of less than
100°F (38°C). Colder inlet water temperatures will result in significant condensation developing on
the heat exchanger. This situation can cause a corrosive environment for the heat exchanger,
burners and venting resulting in premature damage, which could result in serious personal injury or
death.
For systems that use large volumes of cold water or system utilizing heavy water draws (Cer-Temp),
condensation can be prevented by using a by-pass loop. See page 16.
TABLE 3, RECOVERY CAPACITIES
U.S. Gallons/Hr and Litres/Hr at TEMPERATURE RISE INDICATED
F
20F
30F
36F
40F
50F
54F
60F
70F
72F
80F
90F
100F
108F
110F
120F
126F
130F
140F
MODEL
BTUH
KW
C
11.1C
16.6C
20C
22.2C
27.7C
30C
33.3C
38.8C
40C
44.4C
50C
55.5C
60C
61.1C
66.6C
70C
72.2C
77.7C
720,000
GPH
3,535
2,356
1,964
1,767
1,414
1,309
1,178
1,010
982
884
785
707
655
643
589
561
544
505
211
LPH
13,379 8,920
7,433
6,690
5,352
4,955
4,460
3,823
3,716
3,345
2,973
2,676
2,478
2,433
2,230
2,124
2,058
1,911
840,000
GPH
4,124
2,749
2,291
2,062
1,649
1,527
1,375
1,178
1,145
1,031
916
825
764
750
687
655
634
589
246
LPH
15,609 10,406 8,672
7,805
6,244
5,781
5,203
4,460
4,336
3,902
3,469
3,122
2,891
2,838
2,602
2,478
2,401
2,230
960,000
GPH
4,713
3,142
2,618
2,356
1,885
1,745
1,571
1,346
1,309
1,178
1,047
943
873
857
785
748
725
673
281
LPH
17,839 11,893 9,911
8,920
7,136
6,607
5,946
5,097
4,955
4,460
3,964
3,568
3,304
3,243
2,973
2,832
2,744
2,548
1,080,000
GPH
5,367
3,578
2,982
2,684
2,147
1,988
1,789
1,534
1,491
1,342
1,193
1,073
994
976
895
852
826
767
316
LPH
20,317 13,545 11,287 10,158 8,127
7,525
6,772
5,805
5,644
5,079
4,515
4,063
3,762
3,694
3,386
3,225
3,126
2,902
1,210,000
GPH
6,013
4,009
3,341
3,007
2,405
2,227
2,004
1,718
1,670
1,503
1,336
1,203
1,114
1,093
1,002
954
925
859
354
LPH
22,762 15,175 12,646 11,381 9,105
8,430
7,587
6,504
6,323
5,691
5,058
4,552
4,215
4,139
3,794
3,613
3,502
3,252
1,350,000
GPH
6,709
4,473
3,727
3,355
2,684
2,485
2,236
1,917
1,864
1,677
1,491
1,342
1,242
1,220
1,118
1,065
1,032
958
395
LPH
25,396 16,931 14,109 12,698 10,158 9,406
8,465
7,256
7,054
6,349
5,644
5,079
4,703
4,617
4,233
4,031
3,907
3,628
1,480,000
GPH
7,176
4,784
3,987
3,588
2,870
2,658
2,392
2,050
1,993
1,794
1,595
1,435
1,329
1,305
1,196
1,139
1,104
1,025
433
LPH
27,162 18,108 15,090 13,581 10,865 10,060 9,054
7,761
7,545
6,791
6,036
5,432
5,030
4,939
4,527
4,311
4,179
3,880
1,610,000
GPH
7,806
5,204
4,337
3,903
3,122
2,891
2,602
2,230
2,168
1,952
1,735
1,561
1,446
1,419
1,301
1,239
1,201
1,115
472
LPH
29,548 19,699 16,416 14,774 11,819 10,944 9,849
8,442
8,208
7,387
6,566
5,910
5,472
5,372
4,925
4,690
4,546
4,221
1,810,000
GPH
8,776
5,851
4,875
4,388
3,510
3,250
2,925
2,507
2,438
2,194
1,950
1,755
1,625
1,596
1,463
1,393
1,350
1,254
530
LPH
33,219 22,146 18,455 16,609 13,288 12,303 11,073
9,491
9,227
8,305
7,382
6,644
6,152
6,040
5,536
5,273
5,111
4,746
DB/DW-840
DB/DW-1610
DB/DW-1810
DB/DW-1350
DB/DW-1480
INPUT
DB/DW-720
DB/DW-1210
DB/DW-960
DB/DW-1080
TABLE 2, PRESSURE DROP
F
C
GPM LPM
ft
M
20
11.1
59
223
3.5
1.1
30
16.7
39
149
1.7
0.5
40
22.2
29
111
1.0
0.3
20
11.1
69
260
4.8
1.5
30
16.7
46
173
2.1
0.6
40
22.2
34
130
1.5
0.5
20
11.1
79
297
6.8
2.1
30
16.7
52
198
3.3
1.0
40
22.2
39
149
1.9
0.6
20
11.1
89
339
4.5
1.4
30
16.7
60
226
2.1
0.6
40
22.2
45
169
1.4
0.4
20
11.1
100
379
5.3
1.6
30
16.7
67
253
2.7
0.8
40
22.2
50
190
1.6
0.5
20
11.1
112
423
6.8
2.1
30
16.7
75
282
3.2
1.0
40
22.2
56
212
1.8
0.5
20
11.1
120
453
7.9
2.4
30
16.7
80
302
3.9
1.2
40
22.2
60
226
2.1
0.6
20
11.1
130
492
9.5
2.9
30
16.7
87
328
5.0
1.5
40
22.2
65
246
3.0
0.9
20
11.1
146
554
12.0 3.7
30
16.7
98
369
6.2
1.9
40
22.2
73
277
3.9
1.2
DW-720
DW-1210
Model
Temp Rise
DW-1810
DW-1610
HdLoss*
DW-1480
DW-1080
DW-960
DW-840
Flow Rate
DW-1350
