Reference dimensions are ± 10%
All dimensions are ± 1"
MM/DD/YY MM/DD/YY
1/2"=1'
Custom
Dwg No.
Customer / Job name:
Scale:
Description:
Date:Drawn/
Revised by:
Checked/
Apv. by:
Revision:
Description:
Date:Drawn/
Revised by:
Checked/
Apv. by:
Revision:
(1)HWD 299 to HET 220
AJT 05/24/10
XX
City Water
Connection
30
PART 5. PIPING
E. WATER HEATING PIPING
1 Use only the pipe sizes shown and a pump meeting the listed specifications in the following tables:
*NOTE: Individual Appliance Piping pressure drop used in the tables is based on 20 feet of straight pipe, 6 elbows,
2 tees, 2 full port ball valves and 2 unions.
2) The city cold water supply to the water heating system should be connected between the heater outlet and the
storage tank or the storage tank directly. This will help minimize unnecessary short cycling due to small hot water
draws. Higher eciency can be obtained through use of our optional CWIS™—Cold Water Injection System in any
Hamilton Storage Tank.
3) Isolation valves should be installed on each heater and on the cold and hot water system connections.
Upon completion of piping, fill and properly purge of all air. Open all valves and start circulating pump. Consult
Hamilton Engineering for specific piping diagrams for your application at 800.968.5530.
NOTE: Minimum pump selection is based on piping sizes shown above and water hardness not to exceed 15 grains
per gallon and total maximum equivalent piping length of 60 feet.
TABLE 52 WATER HEATER PIPING
Model GPM ∆P* Design ∆T
Pump
Supplied
Minimum Manifold Pipe Size
Single Double Triple Quad
HW 299 16.5 @ 22.9’ 35.3º F 19.6º C PMP 90307 1.5” 2” 2” 2.5”
HW 399 26.4 @ 20.3’ 29.4º F 16.3º C PMP 90309 2” 2” 2.5” 3”
HW 599 39.6 @ 23.6’ 30.9º F 17.1º C PMP 90309 2” 2.5” 3” 4”
*Water heater and piping as described above.
FIGURE 52 HEATER PIPING
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