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General Information
Table A: Basic Data
6
Component Locations
Fig. 1: Component Locations — Sides
Fig. 2: Component Locations — Top
Fig. 3: Component Locations — Rear
Model
No.
MBTUH
Input
Water
conn.
(NPT)
Gas conn.
(NPT)
Vent Size
(inches)
Max. Min. N P Flue Intake
300 300 60 1-1/2” 3/4” 3/4” 4 4
500 500 100 2” 1” 1” 4 4
850 850 170 2” 1-1/4” 1-1/4” 6 6
Model 300 shown. Component locations may vary slightly in larger models.