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B4 Volume Water Heater
Clearance
From
Top
Water Conn. Side
Opposite Side
Front
Rear
Vent Pipe*
Hot Water Pipes
*1" when using type B Vent (refer to Manufacturer's
Instructions
Table 1. Minimum Heater Clearances
Figure 2. Typical Heater Installation with Base for Com-
bustible Floors, Example A.
20 GA
Galvanized
Sheet Metal
Cap
Roof
Figure 3. Typical Heater Installation with Base for Com-
bustible Floors, Example B.
Indoor
(inches)
30
12
6
Alcove
8
6
Per Code
From Combustible Surfaces.
Concrete Slab Must Extend Out A
Minimum Of 12" On All Sides
Unit
(End View)
Base For Combustible Floors
Concrete Slab - 4" Minimum
Roof - Wood & Steel Construction
Mounting Platform Must Extend Out A
Minimum Of 12" On All Sides
Unit
(End View)
Base For Combustible Floors
Raised Mounting
Platform (Wood)
Outdoor
(inches)
Unobstructed
24
24
Unobstructed
Base
Rail
24
—
Roofing
Per Code
Figure 4. Typical Heater Installation with Base for Com-
bustible Floors, Example C.
Base
Rail
Figure 5. Installation on Concrete Blocks or Tile.
CLOSET INSTALLATION
A closet is any 4 sided enclosure
which is less than 16
volume of all the gas fired appliances
within the enclosure.
Base
Rail
Flashing
Roof
*
When the ceiling height exceeds 8 feet, you are only allowed to consider 8
feet when calculating the total volume of the enclosure.
Figure 6. Alcove Installation.
Unit
(Front View)
Base for Combustible Floors
Flashing
Base Must Extend Out
Min. 12" On All Sides
Of Heater Frame
Concrete Blocks Or Tile
Min. 7" High With 3" Min.
Air Openings
Blocks must provide solid base and be
braced so they cannot slip out of place. Air
openings in blocks must be arranged to
provide unobstructed opening through entire
width or length of base.
ROOM INSTALLATION
(UNACCEPTABLE)
A room is any enclosure which is at
times the total
least 16
*
volume of all the gas fired appliances
within the enclosure.
ALCOVE INSTALLATION
An alcove suitable for the installa-
Water
tion of a water heater is a restricted
section of a room not separated from
Heater
the room by a door or partition and
which meets the minimum clearances
for the specific model water heater
listed below.
Page 5
20 GA
Galvanized
Sheet Metal
Cap
Roof
4X4 Stringer
Metal Plate 20
Ga. Min.
Under Entire
Heater
Water
Heater
(ACCEPTABLE)
times greater than the total
*
(ACCEPTABLE)
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