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All Categories > Commercial Water Heaters > Low NOx Commercial Water Heaters > A.O. Smith® Low NOx Commercial Water Heaters > Master-Fit® Plus Induced Draft Low NOx Commercial Gas Tank-Type Water Heaters > Item # BTN250(A)  

Item # BTN250(A), Master-Fit® Plus Induced Draft Low NOx Commercial Gas Tank-Type Water Heaters

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Unit of Measure: Imperial Metric Both

Specifications  · Electrical Characteristics  · Dimensions  · Maximum Recovery (ºF)  · Options  · Features  · Testing and Certifications  · Warranty  · Note

Specifications

Manufacturer
A. O. Smith®

Sides and Rear Clearance to Combustibles
2 in

Top Cover Clearance to Combustibles
12 in

Sides and Rear Clearance to Non-Combustibles
0 in

Top Cover Clearance to Non-Combustibles
12 in

Top Inlet Water Connection
1-1/2 in

Front Inlet Water Connection
1-1/2 in

Back Inlet Water Connection
2 in

Top Outlet Water Connection
1-1/2 in

Front Outlet Water Connection
1-1/2 in

Back Outlet Water Connection
2 in

Maximum Gas Supply Pressure
14 inWc

Minimum Gas Supply Pressure
5.2 inWc

Manifold Pressure
3.5 inWc

Approximate Tank Capacity
100 gal

Type
Natural Gas

Input Rating
250000 BTU/hr

Standard Approximate Shipping Weight
660 lb

ASME Approximate Shipping Weight
710 lb

Industry Standards
ANSI Z-21.10.3 - CSA 4.3
ASHRAE/IESNA 90.1
ASME Certified


Electrical Characteristics

AC Voltage
120 V

Current
5 A


Dimensions

Schematic

Dimension A
72 in

Dimension B
4-1/2 in

Dimension C
70-7/8 in

Dimension D
61-5/8 in

Dimension E
20-1/2 in

Dimension F
21 in

Dimension G
3/4 in

Dimension H
61 in

Dimension I
6 in

Dimension J
27-3/4 in


Maximum Recovery (ºF)

Recovery at 40 ºF Temperature Rise
600 gal/h

Recovery at 50 ºF Temperature Rise
480 gal/h

Recovery at 60 ºF Temperature Rise
401 gal/h

Recovery at 70 ºF Temperature Rise
343 gal/h

Recovery at 80 ºF Temperature Rise
300 gal/h

Recovery at 90 ºF Temperature Rise
266 gal/h

Recovery at 100 ºF Temperature Rise
240 gal/h

Recovery at 110 ºF Temperature Rise
218 gal/h

Recovery at 120 ºF Temperature Rise
200 gal/h

Recovery at 130 ºF Temperature Rise
184 gal/h

Recovery at 140 ºF Temperature Rise
171 gal/h


Options
  • Manifold kits for multiple heater installations
  • Meets NSF Standard 5 with optional leg kit


Features
Eighty plus percentage thermal efficiency affords lower operating costs on most models.

Induced Draft Built-in Blower - The blower is built into the top cover, factory mounted and wired. Ideal for installations where negative pressure is present in the building. Blower proves draft prior to ignition. No draft hood or barometric damper required.

Metal Venting - Rated Category I Appliance. Uses standard metal single wall or double wall type “B” vent. Can be commonly vented with other Category I appliances. Vent connects directly to the blower outlet. Perfect choice for retrofit and upgrade installations.

Rated Category I Appliance. Uses standard metal single wall or double wall type “B” vent. Can be commonly vented with other Category I appliances. Vent connects directly to the blower outlet. Perfect choice for retrofit and upgrade installations.

Water Connections - For ease of installation, all BTNs feature water connections on the top, front, and rear.

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. The maximum working pressure is 160 psi.

Installed Cost Savings - When multiple BTN units are exclusively used in a vent manifold, use the National Fuel Gas Code Table 13 Fan Sizing Charts to determine vent diameter and specifications. The BTN with its internal induced draft blower enables safe use of smaller vent diameters. This feature can save hundreds of dollars in installation costs.

Fully Automatic Digital Controls with Safety Shutoff - Accurate, dependable control system. Manual reset gas shutoff device for added safety. Maximum inlet gas pressure is 14” W.C. Minimum gas pressure is 5.2” 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. 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 - CoreGard™ long-life, stainless steel core anode rods.

Plug Kits - Pipe nipples and caps are included to plug unused water connections.
  • Equipped with gas pressure regulator and pilot filter.
  • 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.
  • Cathodic protection.
  • Adjustable thermostat with a 120 to 180 ºF range.


Testing and Certifications
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. Models also comply with California Energy Commission (CEC) and Texas low NOx and Air Quality Management Districts with requirements of less than 40 ng/j.

BTN199C Models are available for sale in California only.


Warranty
  • 3-Year Limited Tank Warranty.


Note
All dimensions are in inches

+BTN120 is approved for 5" vent using a 6 x 5 reducer.


 MORE IMAGES 

·  Standards for Master-Fit® Plus Induced Draft Low NOx Commercial Gas Tank-Type Water Heaters

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 DOWNLOADS 

Brochure for Master-Fit® Plus Induced Draft Low NOx Commercial Gas Tank-Type Water Heaters
(PDF, 613KB)


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