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Hot Water Sizing Method For Honeywell Mixing Valve Selection
Table 1 – Fixture Unit Worksheet
Fixture Units Fixture Unit Calculation
Fixture Private Public # of Fixtures (multiply by) Fixture Units Equals Total
Lavatory 1 2 x =
Kitchen Sink 2 4 x =
Bathtub 2 4 x =
Separate Shower 2 4 x =
Clothes Washer 2 4 x =
Dish Washer 1 2 x =
Total
Step 1 - Determine Fixture Units – Table 1
Step 2 - Using Total Fixture Units determine load in Gpm from Table 2.
Step 3 - Select product based on minimum flow requirement and allowable pressure drop (20 psi).
Example – A system with 40 Lavatory (private), 40 Bathtubs (private) and 5 Lavatory (public) has total fixture count of 130 fixture units.
From Table 2 - 130 fixture unit = 38 Gpm
Table 2 – Domestic Hot Water Demand – Load Data
Fixture Units Gpm Fixture Units Gpm Fixture Units Gpm
2 2 55 23 350 72
6 4.5 60 24 400 78
10 6.5 70 27 450 86
14 8.5 80 29 500 93
20 11 90 31 550 100
24 13 100 33 600 107
30 15 130 38 650 115
34 16.5 160 43 700 122
40 18.5 200 49 750 130
45 20 260 58 800 134.5
50 21 300 64 1000 156
Mixing Valve Selection Chart
Product
Min Flow
GPM
Outlet Size
Inch
System Differential Pressure Drop (PSI)
5 10 15 20 25 30
AM-1 Series
AM100(C)1 0.5 ½" 7 10 12 14 16 18
AM101(C)1 0.5 ¾" 8 12 15 17 19 21
AM102(C)1 0.5 1" 10 14 17 19 21 24
AM10xUx1 0.5 ½" thru 1" 9 12 15 17 20 21
AM10xC1070Ux1 0.5 ½" thru 1" 4 6 7 8 9 10
AMX-1 Series
AMX10xUx1 0.5 ½" thru 1" 9 13 15 18 20 22
Single High Capacity MX Series
MX127LF 1 1" 9 13 15 18 20 22
MX128LF 2.5 1¼" 21 29 36 42 47 51
MX129LF 3.5 1½" 30 43 52 60 68 74
MX130LF 5 2" 40 57 70 80 90 99
MX131LF 8 2½" 76 108 132 152 170 186
MX132LF 12 3" 112 158 194 224 250 274
FLOW GPM
Note: AM10xUx1 represents all union AM Series valves (Sweat US and Threaded UT). (C) temperature range 70°F to 120°F; without (C) standard
temperature 110°F to 150°F (70°F to 145°F for AM series)
This sizing method is a general guideline. Please refer to local building and plumbing codes for additional guidance.