Westinghouse WGRGH20**75F Series Installation, Start-Up, Maintenance, Parts, Warranty page 20

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Figure 12 - Water Heater with Storage Tank
NOTES:
1. Minimum pipe size should match connection size. Upsize pipe accordingly if greater flow is required.
2. A thermal expansion tank suitable for potable water must be sized and installed within this piping system between the backflow preventer and the cold
water inlet.
3. All circulators should have an integral flow check.
4. Drains and check valve between water heater and piping will assist in purging air from system.
5. These drawings are meant to demonstrate system piping only. The installer is responsible for all equipment and detailing required by local codes. In
Massachusetts, you must install a vacuum breaker per 248 CMR.
6. Always shut off power to the water heater or isolate the heater from the system if ANY plumbing work is to be done. Running the water heater without water
will result in dry-firing.
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7. Thermostatic mixing valve should be set 5 F below the maximum stored tank temperature setpoint. For example: 125 F stored tank temperature setpoint
o
= 120 F thermostatic mixing valve setpoint.
NOTE: These drawings are meant to show system piping concept only. Installer is responsible for all equipment and detailing required by local codes.
whl-605 Rev. 002 Rel. 000 Date 1.23.19