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2
INSTALLATION
2.12 Allowance for Expansion
Allowances must be made for the system to
expand as detailed in the Heater Expansion Chart
on this page. The supplied stainless-steel, flexible
gas connector is recommended. If, however, local
codes require rigid piping to the heater, a swing
joint can be used.
Exchanger length and gas input will determine overall expansion. Heaters in a typical installation will expand towards both the burner and
vent ends. Review for proper flexible gas connector installation.
EXCHANGER LENGTH
FEET
/
METERS
10
3.1
15
4.6
20
6.1
20
6.1
20
6.1
20
6.1
20
6.1
30
9.2
30
9.2
30
9.2
30
9.2
30
9.2
40
12.2
40
12.2
40
12.2
40
12.2
40
12.2
50
15.3
50
15.3
50
15.3
50
15.3
50
15.3
60
18.3
60
18.3
60
18.3
60
18.3
70
21.4
70
21.4
80
24.4
HEATER EXPANSION CHART
FIXED OR HIGH-FIRE
GAS INPUT BTUh
25,000
32,000
40,000
50,000
60,000
75,000
100,000
50,000
60,000
75,000
100,000
125,000
75,000
100,000
125,000
150,000
175,000
100,000
125,000
150,000
175,000
200,000
125,000
150,000
175,000
200,000
175,000
200,000
200,000
23
EXPANSION LENGTH
INCHES
1/2
3/4
1
1 1/4
1 1/2
1 3/4
1 7/8
1 1/4
1 1/2
1 3/4
1 7/8
2
1 1/2
1 7/8
2 1/8
2 1/2
2 3/4
2
2 1/8
2 3/8
2 1/2
2 3/4
2 1/2
2 3/4
3
3 1/4
3 3/8
3 1/2
3 1/2
MILLIMETERS
12.7
19.1
25.4
31.8
38.1
44.5
47.6
31.8
38.1
44.5
47.6
50.8
38.1
47.6
54.0
63.5
69.9
50.8
54.0
60.3
63.5
69.9
63.5
69.9
76.2
82.6
85.7
88.9
88.9
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