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Vertical Height (Extension Kit)
It is simple to determine which kit is needed for vertical height. Take the
total height (to the top of the flue) required and comparing that to “F
dimension” in the chart #1, it can be determined which kit needs to be
used vertically.
FIGURE 11.
FIGURE 12.
CHART #1.
BTU’s DIMENSION “F” (IN INCHES)
*Gal. in 1000’s 9000687 9001246 9001247 9001248
Cap. Nat/L.P STD. MIN. MAX. MIN. MAX. MIN. MAX.
40 36/36 63 3/4 72 77 77 88 88 110
50 38/38 72 80 3/4 86 86 1/4 97 1/4 97 1/4 118 3/4
40 40/40 63 3/4 72 77 77 88 88 110
50 48/44 76 84 1/4 89 3/4 89 3/4 100 3/4 100 3/4 122 3/4
75 55 NAT. 76 1/4 84 1/2 89 1/2 89 1/2 100 1/2 100 1/2 122 1/2
BTU’s DIMENSION “F” (IN CENTIMETERS)
*Gal. in 1000’s 9000687 9001246 9001247 9001248
Cap. Nat/L.P STD. MIN. MAX. MIN. MAX. MIN. MAX.
40 36/36 162 183 196 196 224 224 279
50 38/38 183 205 218 219 247 247 302
40 40/40 162 183 196 196 224 224 279
50 48/44 193 214 228 228 256 256 312
75 55 NAT. 194 215 227 227 255 255 311
*Check the model and rating plate attached to the water heater for
specific model number and other detailed information.
Horizontal (Extension Kit)
To determine the horizontal length and extension kit needed, simply
plug the dimensions “D” and “G” into the equation below. The answer
“E” should then be located in Chart #2. The size range in which “E”
dimension falls indicates the kit that should be used horizontally to
obtain the desired length.
“D” = The wall thickness
“G” = The distance wanted between the edge of the water heater
and the inside edge of the wall
“E” = The distance the extension kit must be able to extend
The Equation: D + G = E
FIGURE 13 .
CHART #2.
DIMENSION “E” (IN INCHES)
40-50 GAL. 75 GAL.
VENT KITS MIN MAX MIN MAX
9000687-Std. 3 1/2 10 7/8 7 3/8
9001246 10 15 1/2 7 3/8 12 7/8
9001247 15 1/2 26 1/2 12 7/8 23 7/8
9001248 26 1/2 48 23 7/8 45 3/8
DIMENSION “E” (IN CENTIMETERS)
40-50 GAL. 75 GAL.
VENT KITS MIN MAX MIN MAX
9000687-Std. 8.9 cm 25.4 cm 2.2 cm 18.7 cm
9001246 25.4 cm 29.4 cm 18.7 cm 32.7 cm
9001247 39.4 cm 67.3 cm 32.7 cm 60.6 cm
9001248 67.3 cm 121.9 cm 60.6 cm 115.3 cm
BTU’s DIMENSION “A, B, C” (INCHES/CENTIMETERS)
*Gal. in 1000’s
Cap. Nat.
ABC
40 36/36 48 3/4” 124 cm 41 3/4” 106 cm 21” 53 cm
50 38/38 57 1/2” 146 cm 50 1/2” 128 cm 21” 53 cm
40 40/40 48 3/4” 124 cm 41 3/4” 106 cm 21” 53 cm
50 48/44 61” 155 cm 54” 137 cm 21” 53 cm
75 55 NAT. 63” 160 cm 54 3/4” 139 cm 26 1/4” 67 cm