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HTD
Table 16. Water Heater Water Flow and Headloss Data
4.C Water Heater Water Flow and Headloss Data
Table 16. Minimum Boiler Water Flow
4.C. Water Heater Water Flow and
Headloss Data
Water flow and headloss for water heaters is based
on the water's hardness, to help minimize scale
(mineral) buildup inside the heater's water tubes.
Table 17 shows water flow and headloss based on
the hardness of the system's water. Temperature
rise is shown for information and
testing/troubleshooting purposes.
Model
1-10 Grains Per Gallon Hardness
11-15 Grains Per Gallon Hardness
Flow Rate
(gpm)
Headloss*
(ft)
Temp Rise
(°F)
Flow Rate
(gpm)
Headloss*
(ft)
Temp Rise
(°F)
1600
152
31.0
20
177
41.0
17
2000
152
33.0
25
177
43.9
21
2500
190
33.7
25
220
46.0
21
3000
190
36.0
30
220
46.0
26
3500
222
30.6
30
266
40.6
25
4000
224
30.0
34
266
41.2
29
*Headloss is for heater only (no piping)
Model
1-10 Grains Per Gallon Hardness
11-15 Grains Per Gallon Hardness
Flow Rate
(l/m)
Headloss*
(m)
Temp Rise
(°C)
Flow Rate
(l/m)
Headloss*
(m)
Temp Rise
(°C)
1600
575
9.4
11
670
12.5
9
2000
575
10.1
14
670
13.4
12
2500
719
10.3
14
833
14.0
12
3000
719
11.0
17
833
14.0
14
3500
840
9.3
17
1007
12.4
14
4000
848
9.1
19
1007
12.6
16
*Headloss is for heater only (no piping)
Table 17. Water Heater Water Flow and Headloss Data
Water flow and headloss for water heaters is based on
the water’s hardness, to help minimize scale (mineral)
buildup inside the heater’s water tubes. Table 16
shows water flow and headloss based on the hardness
of the system’s water. Temperature rise is shown for
information and testing/troubleshooting purposes.
