®
Commercial Gas Water Heaters
Revised April 2012
PG 3 OF 4
www.hotwater.com
AOSCG10500
ROUGH-IN DIMENSIONS
SIDE VIEW OF BTN
Models 120-400
TOP VIEW OF BTN
Clearance to Combustibles
Clearance to Non-Combustibles
Model
Sides & Rear
Top Cover
Sides & Rear
Top Cover
BTN120
1”
12”
0”
12”
BTN154
1”
12”
0”
12”
BTN180
1”
12”
0”
12”
BTN199C
2”
12”
2”
12”
BTN199
1”
12”
0”
12”
BTN200(A)
1”
12”
0”
12”
BTN250(A)
2”
12”
0”
12”
BTN275(A)
2”
12”
0”
12”
BTN310(A)
2”
12”
0”
12”
BTN366(A)
3”
12”
0”
12”
BTN400(A)
3”
12”
0”
12”
Water Connections in Inches
Inlet
Outlet
Models
Top
Front
Back
Top
Front
Back
BTN120
1 1/2
1 1/2
1 1/2
1 1/2
1 1/2
1 1/2
BTN154
1 1/2
1 1/2
1 1/2
1 1/2
1 1/2
1 1/2
BTN180
1 1/2
1 1/2
1 1/2
1 1/2
1 1/2
1 1/2
BTN199C
1 1/2
1 1/2
1 1/2
1 1/2
1 1/2
1 1/2
BTN199
1 1/2
1 1/2
1 1/2
1 1/2
1 1/2
1 1/2
BTN200(A)
1 1/2
1 1/2
2
1 1/2
1 1/2
2
BTN250(A)
1 1/2
1 1/2
2
1 1/2
1 1/2
2
BTN275(A)
1 1/2
1 1/2
2
1 1/2
1 1/2
2
BTN310(A)
1 1/2
1 1/2
1 1/2
1 1/2
1 1/2
1 1/2
BTN366(A)
1 1/2
1 1/2
1 1/2
1 1/2
1 1/2
1 1/2
BTN400(A)
1 1/2
1 1/2
1 1/2
1 1/2
1 1/2
1 1/2
Gas Pressure Requirements
Natural Gas
Max. Supply Pressure
14” w.c.
Min. Supply Pressure
5.2” w.c.
Manifold Pressure
3.5” w.c.
Electrical Specifications
Volts
Amps
BTN
120VAC
5.0
