Unit of Measure



N/A A. O. Smith®

Maximum Working Pressure

N/A 150 psi

Maximum Gas Inlet Pressure

N/A 14 inWc

Approximate Capacity

N/A 98 gal371 L

Input Rating

N/A 75100 BTU/hr22 kW/hr


N/A Natural Gas

Approximate Shipping Weight

N/A 350 lb158.8 kg


N/A Baked Enamel

Equipment Grade

N/A Commercial

Industry Standards

N/A AHRI Certified® ASME Certified CSA® Certified UL® Listed

Maximum Recovery (ºF)

Recovery at 30 ºF Temperature Rise

N/A 246 gal/h

Recovery at 40 ºF Temperature Rise

N/A 184 gal/h

Recovery at 50 ºF Temperature Rise

N/A 148 gal/h

Recovery at 60 ºF Temperature Rise

N/A 123 gal/h

Recovery at 70 ºF Temperature Rise

N/A 105 gal/h

Recovery at 80 ºF Temperature Rise

N/A 92 gal/h

Recovery at 90 ºF Temperature Rise

N/A 82 gal/h

Recovery at 100 ºF Temperature Rise

N/A 74 gal/h

Recovery at 110 ºF Temperature Rise

N/A 67 gal/h

Recovery at 120 ºF Temperature Rise

N/A 62 gal/h

Recovery at 130 ºF Temperature Rise

N/A 57 gal/h

Recovery at 140 ºF Temperature Rise

N/A 53 gal/h

Maximum Recovery (ºC)

Recovery at 17 ºC Temperature Rise

N/A 927 L/h

Recovery at 22 ºC Temperature Rise

N/A 695 L/h

Recovery at 28 ºC Temperature Rise

N/A 557 L/h

Recovery at 33 ºC Temperature Rise

N/A 462 L/h

Recovery at 39 ºC Temperature Rise

N/A 397 L/h

Recovery at 45 ºC Temperature Rise

N/A 347 L/h

Recovery at 50 ºC Temperature Rise

N/A 309 L/h

Recovery at 56 ºC Temperature Rise

N/A 278 L/h

Recovery at 61 ºC Temperature Rise

N/A 252 L/h

Recovery at 67 ºC Temperature Rise

N/A 233 L/h

Recovery at 72 ºC Temperature Rise

N/A 214 L/h

Recovery at 78 ºC Temperature Rise

N/A 198 L/h



Schematic Drawing for Conservationist® Ultra-Low NOx BL-100 Commercial Gas Water Heaters

Dimension A

N/A 70-1/2 in179.07 cm

Dimension B

N/A 66-1/2 in168.9 cm

Dimension C

N/A 30-15/16 in78.59 cm

Dimension D

N/A 27-3/4 in70.5 cm

Dimension E

N/A 15-3/16 in38.6 cm

Dimension F

N/A 4 in10.2 cm

Dimension G

N/A 15-3/4 in40.0 cm

Dimension H

N/A 16 in40.6 cm

Dimension J

N/A 1-1/4 in3.2 cm

Dimension K

N/A 1-1/4 in. NPT

Dimension L

N/A 1/2 in. NPT

Dimension M

N/A 11-15/16 in30.3 cm



N/A The BL-100 is an Ultra-Low NOx atmospheric vent commercial gas water heater which meets the thermal efficiency and standby loss requirements of the U. S. Department of Energy and Current Edition ASHRAE/IESNA 90.1.

Fully Automatic Controls with Safety Shutoff - Accurate, dependable control system requires no electric connections. Fixed automatic gas shutoff device for added safety. Not recommended for 180 ºF sanitizing.

Heavy Gauge Steel Jacket - Finished with baked enamel over bonderized undercoat.

Glasslined Tank - Maximizes tank life.

Foam Insulation - Saves fuel, helps reduce standby heat loss.

Ultra-Low NOx Emissions - Complies with SCAQMD Rule 1146.2 and other Air Quality Management Districts with similar requirements of 14 ng/j or 20 ppm.

Easy-To-Install - Completely factory-assembled. Only gas, water and vent connections need to be made. All connections are located in front and top of heaters for ease-of-installation and service.

Draft Diverter - Low profile diverter furnished as standard equipment.

Handhole Cleanout - Allows easy tank cleaning.
  • Anodic protection.
  • Equipped with gas pressure regulator.
  • Integral automatic gas shutoff system prevents excessive water temperature.
  • CSA® Certified and ASME Rated T & P Relief Valve.



  • 3-Year Limited Tank Warranty.
  • 1-Year Limited Parts Warranty.