Filter
Top Products
• Installation • Start-Up • Maintenance • Parts
Ratings
17a
Part No. 550-141-705
31
◆
I=B=R Burner ✝ ✝ Boiler Water
Capacity Net I=B=R Ratings
❏ Content Gals. Packaged
✝ ■ * * Positive Boiler
* * Gross Net Stack Presure I=B=R Weight
Light
❍ ■ I=B=R ■■ Firebox Gas In Vent Steam Less
Oil Gas Output Steam Steam Water Boiler Volume Volume Firebox Dia. to Water
Boiler Model GPH MBH MBH Sg. Ft. MBH MBH H.P. Cu. Ft. CFM In. W.C. Inches Water Waterline Lbs.
▲ -378- *F ● 2.40 346 278 871 209 242 8.3 2.61 139 0.22 8 37.5 27.5 1355
▲ -478- *F ● 3.40 494 400 1250 300 348 11.9 3.97 198 0.22 8 49.0 36.0 1615
▲ -578- *F ● 4.45 641 521 1629 391 453 15.6 5.33 259 0.21 8 60.5 44.5 1875
▲ -678- *F ● 5.50 789 643 2008 482 559 19.2 6.69 320 0.21 8 72.0 53.0 2130
▲ -778- *F ● 6.50 937 764 2388 573 664 22.8 8.05 378 0.21 10 83.5 61.5 2390
▲ -878- *F ● 7.50 1084 886 2771 665 770 26.4 9.41 436 0.20 10 95.0 70.0 2650
▲ -978- *F ● 8.50 1232 1007 3154 755 876 30.1 10.77 494 0.20 10 106.5 78.5 2910
▲ -1078- *F ● 9.60 1379 1129 3533 847 982 33.7 12.13 558 0.20 10 118.0 87.0 3165
▲ -1178- *F ● 10.60 1527 1250 3917 938 1087 37.3 13.49 616 0.19 10 129.5 95.5 3425
▲ -1278- *F ● 11.60 1674 1372 4321 1039 1193 41.0 14.85 675 0.19 12 141.0 104.0 3680
▲ Use prefix “BL” for light oil, “BG” for gas, “BGL” for gas-light oil, or “H” for boiler only for use with approved burners. Add prefix “A” to designator
for factory-assembled 78 (ABL-478). Substitute “P” for “B” for fire-tested package unit (PL-478).
* Substitute “S” for steam, “W” for water.
● For T-intermediate section(s) and tankless heater(s) add suffix “(number required) TIH”; for T-intermediate section(s) with cover plate(s) only add suffix “(number
required) TIP”.
◆ Burner input based on maximum of 2,000 feet altitude - for higher altitudes consult a Weil-McLain representative.
** No. 2 fuel oil - Commercial Standard Spec. CS75-56. Heat value of oil - 140,000 Btu/Gal.
❍ Consult Weil-McLain BURNER SPEC AND DATASHEET for gas pressures required.
■ MBH refers to thousands of BTU per hour.
✝ Gross I=B=R ratings have been determined under the I=B=R provision governing forced draft boiler-burner units.
✝✝ Net I=B=R ratings are based on net installed radiation of sufficient quantity for the requirements of the building and nothing need be added for normal piping and
pick-up. Water ratings are based on a piping and pick-up allowance of 1.15. Steam ratings are based on the following allowances: 378 through 1178 - 1.333; 1278
- 1.321. An additional allowance should be made for gravity hot water systems or for unusual piping and pick-up loads. Consult a Weil-McLain representative.
*** Stack gas volume at outlet temperature.
❏ With 0.10" W.C. positive at flue collar.
Note: Sections tested for 80 PSIG working pressure.