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Hot Water Sizing Method For Mixing Valve Selection
1. Determine Fixture Units - Table 2
2. Using Total Fixture Units determine load in Gpm from Table 3.
3. Select product based on minimum flow requirement and allowable pressure drop (20 Psi).
Fixture Units
Fixture
Private
Lavatory
Kitchen Sink
Bathtub
Separate Shower
Clothes Washer
Dish Washer
EXAMPLE:A system with 40 Lavatory (Private), 40 Bathtubs (private) and 5 Lavatory (public) has total fixture count of 130 fix-
ture units. From Table 3 - 130 fixture unit = 38 Gpm
Fixture Units
2
6
10
14
20
24
30
34
40
45
50
Min Flow
Product
GPM
1
2.5
3.5
5
8
MX132LF
12
This sizing method is a general guideline. Please refer to local building and plumbing codes for additional guidance.
Table 2. Fixture Unit Worksheet.
Public
# of Fixtures
1
2
2
4
2
4
2
4
2
4
1
2
Table 3. Domestic Hot Water Demand - Load Data.
Gpm
Fixture Units
2
55
4.5
60
6.5
70
8.5
80
11
90
13
100
15
130
16.5
160
18.5
200
20
260
21
300
Table 4. Single High Capacity MX Series Mixing Valve Selection Chart
Outlet Size
Inch
5
1"
9
1¼"
21
1½"
30
2"
40
2½"
76
3"
112
Fixture Unit Calculation
(multiply by)
Fixture Units
x
x
x
x
x
x
Gpm
23
24
27
29
31
33
38
43
49
58
64
System Differential Pressure Drop (PSI)
10
15
13
15
29
36
43
52
57
70
108
132
158
194
5
MX SERIES VALVES
Equals
Total
=
=
=
=
=
=
Total
Fixture Units
350
400
450
500
550
100
600
107
650
115
700
122
750
130
800
134.5
1000
156
20
25
18
20
42
47
60
68
80
90
152
170
224
250
38-00033EFS-03
72
78
86
93
30
22
51
74
99
186
274
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