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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
FC
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