Catalog
Request Information
Unit of Measure

Specifications

Manufacturer

 N/A A. O. Smith®

Equipment Grade

 N/A Commercial

Input Power

 N/A 275000 KBTU/hr81 kW

Capacity

 N/A 85 U.S. gal322 L

Thermal Efficiency

 N/A 82 %

Type

 N/A Natural Gas

Minimum Gas Supply Pressure

 N/A 0.87 kPa15 inWc

Maximum Gas Supply Pressure

 N/A 14 inWc3.48 kPa

Sides and Rear Clearance to Combustibles

 N/A 0 in

Top Cover Clearance to Combustibles

 N/A 12 in

Sides and Rear Clearance to Non-Combustibles

 N/A 0 in

Top Cover Clearance to Non-Combustibles

 N/A 12 in

Top Inlet Water Connection

 N/A 1-1/2 in

Front Inlet Water Connection

 N/A 1-1/2 in

Back Inlet Water Connection

 N/A 1-1/2 in

Top Outlet Water Connection

 N/A 1-1/2 in

Front Outlet Water Connection

 N/A 1-1/2 in

Back Outlet Water Connection

 N/A 1-1/2 in

Standard Approximate Shipping Weight

 N/A 850 lb386 kg

ASME Approximate Shipping Weight

 N/A 900 lb408 kg

Industry Standards

 N/A ANSI Z-21.10.3 - CSA 4.3 ASHRAE/IESNA 90.1 ASME Certified

Dimensions

Schematic

 N/A
Schematic Drawing for Master-Fit® Ultra-Low NOx Commercial Gas Water Heaters (BTL-275(A) to BTL-400(A))

Dimension A

 N/A 76 in193 cm

Dimension B

 N/A 16-1/4 in41.2 cm

Dimension C

 N/A 78-1/4 in198.8 cm

Dimension D

 N/A 65-3/4 in167 cm

Dimension E

 N/A 25-3/4 in65.4 cm

Dimension F

 N/A 21 in53.3 cm

Dimension G

 N/A 3/4 NPT

Dimension H

 N/A 66-1/4 in168.3 cm

Dimension I

 N/A 6 in15.2 cm

Dimension J

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

Dimension K

 N/A 1-1/2 NPT

Dimension L

 N/A 1-1/2 NPT

Dimension M

 N/A 41 in104 cm

Maximum Recovery (ºF)

Recovery at 36 ºF Temperature Rise

 N/A 754 gal/h

Recovery at 40 ºF Temperature Rise

 N/A 678 gal/h1426 L/h

Recovery at 50 ºF Temperature Rise

 N/A 543 gal/h

Recovery at 54 ºF Temperature Rise

 N/A 502 gal/h

Recovery at 60 ºF Temperature Rise

 N/A 452 gal/h

Recovery at 70 ºF Temperature Rise

 N/A 388 gal/h

Recovery at 72 ºF Temperature Rise

 N/A 377 gal/h

Recovery at 90 ºF Temperature Rise

 N/A 339 gal/h

Recovery at 100 ºF Temperature Rise

 N/A 271 gal/h

Recovery at 108 ºF Temperature Rise

 N/A 251 gal/h

Recovery at 110 ºF Temperature Rise

 N/A 247 gal/h

Recovery at 120 ºF Temperature Rise

 N/A 226 gal/h

Recovery at 126 ºF Temperature Rise

 N/A 215 gal/h

Recovery at 130 ºF Temperature Rise

 N/A 209 gal/h

Recovery at 140 ºF Temperature Rise

 N/A 194 gal/h

Maximum Recovery (ºC)

Recovery at 20 ºC Temperature Rise

 N/A 2853 L/h

Recovery at 22 ºC Temperature Rise

 N/A 2567 L/h

Recovery at 28 ºC Temperature Rise

 N/A 2054 L/h

Recovery at 30 ºC Temperature Rise

 N/A 1902 L/h

Recovery at 33 ºC Temperature Rise

 N/A 1712 L/h

Recovery at 39 ºC Temperature Rise

 N/A 1467 L/h

Recovery at 50 ºC Temperature Rise

 N/A 1141 L/h

Recovery at 56 ºC Temperature Rise

 N/A 1027 L/h

Recovery at 60 ºC Temperature Rise

 N/A 951 L/h

Recovery at 61 ºC Temperature Rise

 N/A 934 L/h

Recovery at 67 ºC Temperature Rise

 N/A 856 L/h

Recovery at 70 ºC Temperature Rise

 N/A 815 L/h

Recovery at 72 ºC Temperature Rise

 N/A 790 L/h

Recovery at 78 ºC Temperature Rise

 N/A 734 L/h

Electrical Characteristics

Voltage

 N/A 120 V

Frequency

 N/A 60 Hz

Current

 N/A <5 A

Features

Features

 N/A 82% thermal efficiency means lower operating costs.

Fan Assisted Combustion - The blower is built into the Low NOx burner assembly for Ultra-Low NOx readings that comply with SCQAMD rule1146.2 of 14 ng/j or 20 ppm.

Metal Venting - Rated Category I Appliance. Uses standard double wall type "B" vent. Can be commonly vented with other Category I appliances. Vent connects directly to the vent connector outlet. No Draft hood or barometric damper required. Perfect choice for retrofit and upgrade installations.

Water Connections - For ease of installation, all BTLs feature water connections on the top, front, and rear. "The Eliminator™" inlet water connection eliminates harmful scale buildup, extending the life of the product. The front inlet connection must be used for the Eliminator™ benefits.

Glass Lined Tank - Permaglas® Ultracoat is the proprietary ceramic coating developed by A. O. Smith®’s ceramic engineers specifically for the heater. It is applied after the complete tank has been assembled to give a seamless barrier against hot water corrosion.

Installed Cost Savings - When multiple BTL units are exclusively used in a vent manifold, use the National Fuel Gas Code Table 13 Vent Sizing information to determine vent diameter and specifications. The BTL often uses a smaller vent diameter than a natural draft water heater which saves on installation cost.

Fully Automatic Digital Controls with Safety Shutoff - Accurate, dependable control system. Features a two speed blower control for smooth main burner light-off. Manual reset gas shutoff device for added safety. Maximum inlet gas pressure is 14" W.C. Minimum gas pressure is 3.5" W.C. Natural Gas.

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

Jacket - Heavy gauge steel finished with a baked enamel finish over a bonderized undercoat.

Easy Cleaning - Handhole cleanout allows access for easy cleaning.

Intermittent Ignition Device - Eliminates standing pilot. Provides flame failure response in less than one second. Spark igniter and power ON/OFF switch.

Easy-to-install - Completely factory-assembled. Only gas, water, vent and electric connections need be made. Provided with drain valve.

Anodes - CoreGuard™ long-life, stainless steel core anode rods.

Plug Kits - Pipe nipples and caps are included to plug unused water connections.

Other Standard Features

Other Standard Features

 N/A
  • Integral automatic gas shutoff system prevents excessive water temperature
  • CSA Certified and ASME Rated T&P Relief valve are factory-installed
  • Maximum working pressure is 160 psi standard
  • Adjustable thermostat with a 120 to 180 ºF range.
  • All models certified up to 7700 ft.

Testing and Certifications

Testing and Certifications

 N/A Fully Tested for Safety and Performance - Design certified by the Underwriters Laboratory for 180°F hot water service. Meets rigid requirements of the National Sanitation Foundation when equipped with optional leg kit. Certified for use on combustible flooring.

Approval Ratings and Certification - All models meet ANSI Z21.10.3 - CSA® 4.3 standards and the thermal efficiency and standby loss requirements of the U.S. Department of Energy and current edition of ASHRAE/IESNA 90.1.

NSF LEG Kit
  • Meets NSF Standard 5 with optional leg kit - Part #9008214005
Models available for sale in California only.

Warranty

Warranty

 N/A
  • 3-Year Tank Warranty / 1-Year Parts Limited Warranty.

Note

Note

 N/A A after model number designates ASME construction.

Dimensions and specifications subject to change without notice in accordance with our policy of continuous product improvement.