HD110301-1 Rev2
Page 14 of 23
Table 1
WATTS PER FOOT PIPE REQUIRED
Pipe Dia.
Ambient Temp.
Insulation Thickness
Inch
°F
°C
½"
1"
1 ½"
2"
2 ½"
3"
4"
½
0
-18
2.0
1.3
1.0
1.0
1.0
0.8
0.7
-10
-23
2.5
1.6
1.3
1.2
1.0
1.0
0.8
-20
-29
2.9
2.0
1.6
1.4
1.2
1.0
1.0
-40
-40
3.9
2.5
2.0
1.8
1.6
1.5
1.3
¾
0
-18
2.3
1.5
1.2
1.0
1.0
0.8
0.7
-10
-23
2.9
1.9
1.5
1.3
1.0
1.0
0.9
-20
-29
3.5
2.2
1.8
1.5
1.4
1.3
1.0
-40
-40
4.5
2.9
2.3
2.0
1.8
1.6
1.4
1
0
-18
2.8
1.7
1.4
1.2
1.0
1.0
0.8
-10
-23
3.4
2.1
1.7
1.4
1.3
1.2
1.0
-20
-29
4.1
2.5
2.0
1.7
1.5
1.4
1.2
-40
-40
5.3
3.3
2.6
2.2
2.0
1.8
1.6
1 ¼
0
-18
3.3
2.0
1.6
1.3
1.0
1.1
0.9
-10
-23
4.1
2.5
2.0
1.6
1.4
1.3
1.1
-20
-29
4.9
3.0
2.3
1.9
1.7
1.6
1.3
-40
-40
6.4
3.9
3.0
2.5
2.2
2.0
1.8
1 ½
0
-18
3.7
2.2
1.7
1.4
1.3
1.1
1.0
-10
-23
4.5
2.7
2.1
1.8
1.5
1.4
1.2
-20
-29
5.4
3.3
2.5
2.0
1.8
1.7
1.4
-40
-40
7.1
4.3
3.3
2.7
2.4
2.2
1.9
2
0
-18
4.4
2.6
2.0
1.6
1.4
1.3
1.1
-10
-23
5.5
3.2
2.4
2.0
1.8
1.6
1.4
-20
-29
6.5
3.8
2.9
2.4
2.1
1.9
1.6
-40
-40
8.6
5.0
3.8
3.1
2.7
2.5
2.1
2 ½
0
-18
5.2
3.0
2.3
1.8
1.6
1.4
1.2
-10
-23
6.4
3.7
2.8
2.3
2.0
1.8
1.5
-20
-29
7.6
4.4
3.3
2.7
2.4
2.1
1.8
-40
-40
10.0
5.8
4.3
3.6
3.0
2.8
2.3
3
0
-18
6.1
3.5
2.6
2.1
1.8
1.6
1.4
-10
-23
7.6
4.3
3.2
2.6
2.3
2.0
1.7
-20
-29
9.0
5.2
3.8
3.0
2.7
2.4
2.0
-40
-40
11.9
6.8
5.0
4.0
3.5
3.1
2.6
4
0
-18
7.6
4.3
3.1
2.5
2.2
1.9
1.6
-10
-23
9.5
5.3
3.9
3.1
2.7
2.3
1.9
-20
-29
11.3
6.3
4.6
3.7
3.2
2.8
2.3
-40
-40
14.9
8.3
6.0
4.9
4.1
3.7
3.0