Unit of Measure



N/A A. O. Smith®

Input Power

N/A 199000 BTU/hr

Tank Capacity

N/A 100 U.S. gal379 L

Standard Shipping Weight

N/A 603 lb273 kg


N/A Liquid Propane Gas Natural Gas

Maximum Hydrostatic Working Pressure

N/A 160 psi

Thermal Efficiency

N/A 80 %

Maximum Gas Supply Pressure

N/A 14 inWc

Minimum Gas Supply Pressure

N/A For Liquid Propane Gas: 11 inWcFor Natural Gas: 4.5 inWc

Manifold Pressure

N/A For Liquid Propane Gas: 10 inWcFor Natural Gas: 3.5 inWc

Industry Standards

N/A ANSI Z-21.10.3 - CSA 4.3 ASHRAE/IESNA 90.1 ASME Certified CSA® Certified NSF UL® Listed

Maximum Recovery (ºF)

Recovery at 40 ºF Temperature Rise

N/A 482 gal/h

Recovery at 100 ºF Temperature Rise

N/A 193 gal/h

Recovery at 140 ºF Temperature Rise

N/A 132 gal/h

Maximum Recovery (ºC)

Recovery at 22 ºC Temperature Rise

N/A 1825 L/h

Recovery at 56 ºC Temperature Rise

N/A 731 L/h

Recovery at 78 ºC Temperature Rise

N/A 500 L/h



Schematic Drawing for Master-Fit® Standard Draft Commercial Gas Water Heaters (BTR-120 to BTR-400 (A))

Dimension A

N/A 75 in192 cm

Dimension B

N/A 4-1/2 in12 cm

Dimension C

N/A 70 in178 cm

Dimension D

N/A 61-5/8 in157 cm

Dimension E

N/A 20-1/2 in52 cm

Dimension F

N/A 21 in53 cm

Dimension G

N/A 1/2 in

Dimension H

N/A 61-1/2 in150 cm

Dimension I

N/A 6 in15 cm

Dimension J

N/A 27-3/4 in71 cm



N/A The Master-Fit® BTR series provides outstanding performance and maximum installation flexibility for both new construction and replacement applications. Multiple options for placement of water connections and low installation clearances are additional installer-friendly features.

The Eliminator™ Self-Cleaning System
  • Designed to significantly reduce or eliminate sediment build-up inside the tank.
  • Reduced sediment build-up maintains rated thermal efficiency and reduces water heating costs.
  • Self-cleaning system maximizes tank life.
Factory-Installed Draft Diverter and Automatic Flue Damper (BTR-120-400 Models)
  • Low-profile draft diverter helps for installation in tight spaces.
  • Automatic motorized flue damper helps minimize standby heat loss.
  • BTR-500 Model features induced draft design and no damper.
Three Water Connection Options for Added Flexibility
  • Hot and cold water connections can be made through front, top or rear of unit.
  • Eliminator™ system operates when cold water is connected through front.
Permaglas® Ultra Coat™ Glass Lining
  • Exclusive process provides superior protection against corrosion.
  • CoreGard™ anode rods with stainless steel core provide additional corrosion protection.
Intermittent Electronic Ignition
  • Eliminates standing pilot, saves energy.
  • Includes power ON/OFF switch.
  • Provides flame failure response in less than one second.

Testing and Certifications

Testing and Certifications

N/A Factory-Installed, CSA® Certified and ASME Rated T&P Relief Value
  • Design-certified by UL (Underwriters Laboratories), according to ANSI Z.21.10.3 - CSA® 4.3 standards governing storage-type water heaters
  • Meets the thermal efficiency and standby loss requirements of the U.S. Department of Energy and current edition of ASHRAE/IESNA 90.1
  • Design-certified by Underwriters Laboratories Sanitation to NSF Standard 5 for 180 ºF (82 ºC) water
  • Optional ASME tank construction available

Other Master-Fit® Features

Other Master-Fit® Features

N/A Fully Automatic Control System
  • Manual-reset gas shut-off device prevents excessive water temperature
  • Adjustable thermostat with 120 to 180 ºF range
  • Gas pressure regulator and pilot filter
Handhole Cleanout
  • Allows easy access to tank interior for cleaning
Plug Kits
  • Pipe nipples and caps included to plug unused water connections MASTER-FIT® OPTIONS:
Manifold Kits for Multiple Heater Installations
  • 2-unit kit, Part Number 9003426205
  • 3-unit kit, Part Number 9003427205
  • 4-unit kit, Part Number 9003428205
Optional Leg Kit to Meet NSF Standard 5
  • For all BTR models, Part Number 9003425205
Mechanical Venting Kits
  • For BTR-120 through BTR-200, Part Number 9006015005
  • For BTR-250 through BTR-400, Part Number 9006016005
  • For installation of approved power venter to operate in conjunction with water heater thermostat
  • Field wiring should conform to latest version of the National Electric Code ANSI/NFPA No.70



  • 3-Year Limited Tank Warranty.



N/A Electrical requirements: 120 VAC, 0.7 Amp, Electrical requirements with Power Venter: 120 VAC,3.0 FLAAmps.